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Configure iptables workaround
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Apply iptables workaround
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Configure iptables
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Apply iptables firewall
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traceroute test
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Ansible KVM Router Lab Part 4
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Ansible KVM Router Lab Part 3
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Ansible KVM Router Lab Part 2
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Ansible KVM Router Lab Part 1
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Add KVM Network With Virsh
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KVM On Arch
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2024-04-28 00:45:34 -07:00
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Sandbox IOT Network
< / a >
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2022-02-13 01:34:47 -08:00
< li class = "md-nav__item" >
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QuasselCore on Debian 11
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2021-10-19 17:53:46 -07:00
< li class = "md-nav__item" >
< a href = "../forklift-upgrade-arch-linux-precision-3561/" class = "md-nav__link" >
Forklift Upgrade Arch Linux To A Dell Precision 3561
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2021-10-18 03:27:50 -07:00
< li class = "md-nav__item" >
< a href = "../ansible-kvm-router-lab-part-6/" class = "md-nav__link" >
Ansible KVM Router Lab Part 6
< / a >
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< input class = "md-nav__toggle md-toggle" data-md-toggle = "toc" type = "checkbox" id = "__toc" >
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Ansible KVM Router Lab Part 5
< span class = "md-nav__icon md-icon" > < / span >
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< a href = "./" class = "md-nav__link md-nav__link--active" >
Ansible KVM Router Lab Part 5
< / a >
< nav class = "md-nav md-nav--secondary" aria-label = "Table of contents" >
< label class = "md-nav__title" for = "__toc" >
< span class = "md-nav__icon md-icon" > < / span >
Table of contents
< / label >
< ul class = "md-nav__list" data-md-component = "toc" data-md-scrollfix >
< li class = "md-nav__item" >
< a href = "#introduction" class = "md-nav__link" >
Introduction
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#setup-ansible" class = "md-nav__link" >
Setup Ansible
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#run-ansible" class = "md-nav__link" >
Run Ansible
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#ansible-tasks" class = "md-nav__link" >
Ansible Tasks
< / a >
< nav class = "md-nav" aria-label = "Ansible Tasks" >
< ul class = "md-nav__list" >
< li class = "md-nav__item" >
< a href = "#install-dnsmasq-iptables-persistent" class = "md-nav__link" >
Install dnsmasq, iptables-persistent
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#install-traceroute" class = "md-nav__link" >
Install traceroute
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#backup-etcnetworkinterfaces" class = "md-nav__link" >
Backup /etc/network/interfaces
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#update-network-config" class = "md-nav__link" >
Update Network Config
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#backup-etcdnsmasqconf" class = "md-nav__link" >
Backup /etc/dnsmasq.conf
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#configure-dnsmasq" class = "md-nav__link" >
Configure dnsmasq
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#configure-network-ifup" class = "md-nav__link" >
Configure Network ifup
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#restart-network-and-dnsmasq" class = "md-nav__link" >
Restart Network and dnsmasq
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#backup-etcsysctlconf" class = "md-nav__link" >
Backup /etc/sysctl.conf
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#enable-ipv4-forwarding" class = "md-nav__link" >
Enable ipv4 forwarding
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#start-ipv4-forwarding" class = "md-nav__link" >
Start ipv4 forwarding
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#configure-iptables-workaround" class = "md-nav__link" >
Configure iptables workaround
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#apply-iptables-workaround" class = "md-nav__link" >
Apply iptables workaround
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#configure-iptables" class = "md-nav__link" >
Configure iptables
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#apply-iptables-firewall" class = "md-nav__link" >
Apply iptables firewall
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#traceroute-test" class = "md-nav__link" >
traceroute test
< / a >
< / li >
< / ul >
< / nav >
< / li >
< li class = "md-nav__item" >
< a href = "#to-be-continued" class = "md-nav__link" >
To Be Continued
< / a >
< / li >
< / ul >
< / nav >
< / li >
< li class = "md-nav__item" >
< a href = "../ansible-kvm-router-lab-part-4/" class = "md-nav__link" >
Ansible KVM Router Lab Part 4
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "../ansible-kvm-router-lab-part-3/" class = "md-nav__link" >
Ansible KVM Router Lab Part 3
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "../ansible-kvm-router-lab-part-2/" class = "md-nav__link" >
Ansible KVM Router Lab Part 2
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "../ansible-kvm-router-lab-part-1/" class = "md-nav__link" >
Ansible KVM Router Lab Part 1
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "../add-kvm-network-with-virsh/" class = "md-nav__link" >
Add KVM Network With Virsh
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "../kvm-on-arch/" class = "md-nav__link" >
KVM On Arch
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "../raspberrypi-lte-failover-router-with-dns-caching/" class = "md-nav__link" >
RaspberryPi LTE-Failover Router With DNS Caching
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "../debian-11-nspawn-flutter-integration-test-server/" class = "md-nav__link" >
Flutter Integration Test Server in Debian 11 Nspawn Container
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "../debian-11-ttrss/" class = "md-nav__link" >
Debian 11 TT-RSS
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "../trents-favorite-podcasts/" class = "md-nav__link" >
Trent's Favorite Podcasts
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< li class = "md-nav__item" >
< a href = "../test-qr-svg-django/" class = "md-nav__link" >
Test QR SVG Django
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "../prosody-photo-uploads/" class = "md-nav__link" >
Prosody Photo Uploads
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< li class = "md-nav__item" >
< a href = "../xmpp-apt-notifications/" class = "md-nav__link" >
XMPP Apt Notification
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< li class = "md-nav__item" >
< a href = "../apache-virtual-hosts/" class = "md-nav__link" >
Apache Virtual Hosts
< / a >
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< li class = "md-nav__item" >
< a href = "../sendxmpp-handler-for-python-logging/" class = "md-nav__link" >
SENDXMPP Handler for Python Logging
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "../instructions-for-tethering-from-phone/" class = "md-nav__link" >
Instruction For Tethering From Phone
< / a >
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< li class = "md-nav__item" >
< a href = "../lmde4-custom-partitions-disk-encryption/" class = "md-nav__link" >
LMDE4 Custom Partitions for Disk Encryption
< / a >
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< li class = "md-nav__item" >
< a href = "../linux-move-cursor-with-keyboard/" class = "md-nav__link" >
Linux Move Cursor With Keyboard
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Simplified Raspberry Streaming
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Clear Linux Encrypted XFS Root
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Clear Linux Guest Virt Manager
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Faster Partitioning with Sgdisk
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< li class = "md-nav__item" >
< a href = "../lmde3-xfs-full-disk-encryption/" class = "md-nav__link" >
LMDE3 XFS Full Disk Encryption
< / a >
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< li class = "md-nav__item" >
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Rewrite Hugo Themes Report In Python
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TrentReads
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< a href = "https://blog.trentpalmer.org" class = "md-nav__link" >
AttentionSpanHistory
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GitHub
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< li class = "md-nav__item" >
< a href = "https://play.google.com/store/apps/details?id=org.trentpalmer.libre_gps_parser" class = "md-nav__link" >
LibreGpsParser
< / a >
< / li >
< / ul >
< / nav >
< / div >
< / div >
< / div >
< div class = "md-sidebar md-sidebar--secondary" data-md-component = "sidebar" data-md-type = "toc" >
< div class = "md-sidebar__scrollwrap" >
< div class = "md-sidebar__inner" >
< nav class = "md-nav md-nav--secondary" aria-label = "Table of contents" >
< label class = "md-nav__title" for = "__toc" >
< span class = "md-nav__icon md-icon" > < / span >
Table of contents
< / label >
< ul class = "md-nav__list" data-md-component = "toc" data-md-scrollfix >
< li class = "md-nav__item" >
< a href = "#introduction" class = "md-nav__link" >
Introduction
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#setup-ansible" class = "md-nav__link" >
Setup Ansible
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#run-ansible" class = "md-nav__link" >
Run Ansible
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#ansible-tasks" class = "md-nav__link" >
Ansible Tasks
< / a >
< nav class = "md-nav" aria-label = "Ansible Tasks" >
< ul class = "md-nav__list" >
< li class = "md-nav__item" >
< a href = "#install-dnsmasq-iptables-persistent" class = "md-nav__link" >
Install dnsmasq, iptables-persistent
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#install-traceroute" class = "md-nav__link" >
Install traceroute
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#backup-etcnetworkinterfaces" class = "md-nav__link" >
Backup /etc/network/interfaces
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#update-network-config" class = "md-nav__link" >
Update Network Config
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#backup-etcdnsmasqconf" class = "md-nav__link" >
Backup /etc/dnsmasq.conf
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#configure-dnsmasq" class = "md-nav__link" >
Configure dnsmasq
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#configure-network-ifup" class = "md-nav__link" >
Configure Network ifup
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#restart-network-and-dnsmasq" class = "md-nav__link" >
Restart Network and dnsmasq
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#backup-etcsysctlconf" class = "md-nav__link" >
Backup /etc/sysctl.conf
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#enable-ipv4-forwarding" class = "md-nav__link" >
Enable ipv4 forwarding
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#start-ipv4-forwarding" class = "md-nav__link" >
Start ipv4 forwarding
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#configure-iptables-workaround" class = "md-nav__link" >
Configure iptables workaround
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#apply-iptables-workaround" class = "md-nav__link" >
Apply iptables workaround
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#configure-iptables" class = "md-nav__link" >
Configure iptables
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#apply-iptables-firewall" class = "md-nav__link" >
Apply iptables firewall
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#traceroute-test" class = "md-nav__link" >
traceroute test
< / a >
< / li >
< / ul >
< / nav >
< / li >
< li class = "md-nav__item" >
< a href = "#to-be-continued" class = "md-nav__link" >
To Be Continued
< / a >
< / li >
< / ul >
< / nav >
< / div >
< / div >
< / div >
< div class = "md-content" data-md-component = "content" >
< article class = "md-content__inner md-typeset" >
< h1 > Ansible KVM Router Lab Part 5< / h1 >
< p > date: 2021-10-17< / p >
< h2 id = "introduction" > Introduction< / h2 >
< p > This is Part 5 of a multi-part series of blog posts for building a
< a href = "https://github.com/TrentSPalmer/router-lab" target = "_blank" > router lab< / a >
automatically using a series of bash scripts and ansible.< / p >
< p > < a href = "/posts/ansible-kvm-router-lab-part-1/" target = "_blank" > Ansible KVM Router Lab Part 1< / a >
is an overview.< / p >
< p > In < a href = "/posts/ansible-kvm-router-lab-part-2/" target = "_blank" > Ansible KVM Router Lab Part 2< / a > ,
I break down the script
< a href = "https://github.com/TrentSPalmer/router-lab/blob/master/build_vms.bash" target = "_blank" > build_vms.bash< / a > .< / p >
< p > In < a href = "/posts/ansible-kvm-router-lab-part-3/" target = "_blank" > Ansible KVM Router Lab Part 3< / a > ,
I explain
< a href = "https://github.com/TrentSPalmer/router-lab/blob/master/define_bridge_networks.bash" target = "_blank" > define_bridge_networks.bash< / a >
and
< a href = "https://github.com/TrentSPalmer/router-lab/blob/master/shutdown_vms.bash" target = "_blank" > shutdown_vms.bash< / a >
scripts which are used to construct the lab.< / p >
< p > In < a href = "/posts/ansible-kvm-router-lab-part-4/" target = "_blank" > Ansible KVM Router Lab Part 4< / a > ,
I explain
< a href = "https://github.com/TrentSPalmer/router-lab/blob/master/connect_vms_to_bridges.bash" target = "_blank" > connect_vms_to_bridges.bash< / a > ,
< a href = "https://github.com/TrentSPalmer/router-lab/blob/master/start_vms.bash" target = "_blank" > start_vms.bash< / a > ,
and < a href = "https://github.com/TrentSPalmer/router-lab/blob/master/rebuild_known_hosts.bash" target = "_blank" > rebuild_known_hosts.bash< / a >
scripts which are used to construct the lab.< / p >
< p > In this post I explain how I use Ansible to finish constructing the lab.< / p >
< p > In < a href = "/posts/ansible-kvm-router-lab-part-6/" target = "_blank" > Ansible KVM Router Lab Part 6< / a > ,
I explain
< a href = "https://github.com/TrentSPalmer/router-lab/blob/master/disconnect_vms_from_bridges.bash" target = "_blank" > disconnect_vms_from_bridges.bash< / a > ,
< a href = "https://github.com/TrentSPalmer/router-lab/blob/master/undefine_and_remove_vms.bash" target = "_blank" > undefine_and_remove_vms.bash< / a > ,
and < a href = "https://github.com/TrentSPalmer/router-lab/blob/master/remove_bridge_networks.bash" target = "_blank" > remove_bridge_networks< / a >
which are used to destroy the lab.< / p >
< h2 id = "setup-ansible" > Setup Ansible< / h2 >
< ul >
< li > Configure ansible host file
< div class = "highlight" > < pre > < span > < / span > < code > < span class = "c1" > # ~/.ansible.cfg< / span >
< span class = "k" > [defaults]< / span >
< span class = "na" > inventory< / span > < span class = "o" > =< / span > < span class = "s" > ~/router-lab/ansible/hosts.yml< / span >
< / code > < / pre > < / div > < / li >
< li > Setup bashrc
< div class = "highlight" > < pre > < span > < / span > < code > < span class = "c1" > # ~/.bashrc< / span >
< span class = "nb" > export< / span > < span class = "nv" > LIBVIRT_DEFAULT_URI< / span > < span class = "o" > =< / span > < span class = "s2" > " qemu+ssh://< user> @< server> /system" < / span >
< span class = "nb" > alias< / span > ansible-pb< span class = "o" > =< / span > anspb
anspb< span class = "o" > ()< / span > < span class = "o" > {< / span >
< span class = "nv" > ANS_DIR< / span > < span class = "o" > =< / span > ~/router-lab/ansible/playbooks< span class = "p" > ;< / span >
< span class = "nb" > echo< / span > Changing to < span class = "s2" > " < / span > < span class = "si" > ${< / span > < span class = "nv" > ANS_DIR< / span > < span class = "si" > }< / span > < span class = "s2" > " < / span > and executing: ansible-playbook < span class = "s2" > " < / span > < span class = "si" > ${< / span > < span class = "p" > @< / span > < span class = "si" > }< / span > < span class = "s2" > " < / span >
< span class = "o" > (< / span > < span class = "nb" > cd< / span > < span class = "nv" > $ANS_DIR< / span > < span class = "o" > ||< / span > < span class = "nb" > exit< / span > < span class = "p" > ;< / span > ansible-playbook < span class = "s2" > " < / span > < span class = "si" > ${< / span > < span class = "p" > @< / span > < span class = "si" > }< / span > < span class = "s2" > " < / span > < span class = "o" > )< / span >
< span class = "o" > }< / span >
< / code > < / pre > < / div > < / li >
< li > install apps
< div class = "highlight" > < pre > < span > < / span > < code > apt install ansible ansible-lint
< / code > < / pre > < / div > < / li >
< / ul >
< h2 id = "run-ansible" > Run Ansible< / h2 >
< p > < div class = "highlight" > < pre > < span > < / span > < code > ansible-pb build_out_routers.yml -K
< / code > < / pre > < / div >
or if you want to first update all the clients
< div class = "highlight" > < pre > < span > < / span > < code > ansible-pb update_and_build.yml -K
< / code > < / pre > < / div > < / p >
< h2 id = "ansible-tasks" > Ansible Tasks< / h2 >
< p > This is an explaination of the tasks in the Ansible Playbook.
Playbooks are executed from top to bottom.< / p >
< h3 id = "install-dnsmasq-iptables-persistent" > Install < code > dnsmasq< / code > , < code > iptables-persistent< / code > < / h3 >
< p > This task is only run against the first and second lab clients as
they are the routers.< / p >
< h3 id = "install-traceroute" > Install < code > traceroute< / code > < / h3 >
< p > Traceroute is parsed in a later task to confirm that traffic is
following the correct route.
(Also incidentally installs < code > needrestart< / code > and < code > screen< / code > .)< / p >
< h3 id = "backup-etcnetworkinterfaces" > Backup < code > /etc/network/interfaces< / code > < / h3 >
< p > This is a simple bash command that tests if < code > /etc/network/interfaces.bak< / code >
exists, and if not creates it.< / p >
< h3 id = "update-network-config" > Update Network Config< / h3 >
< p > This task updates < code > /etc/network/interfaces< / code > in all the lab clients
to describe the network interfaces needed to connect to each other.< / p >
< p > For instance, here is the new < code > /etc/network/interfaces< / code > file for < em > dnettwo< / em > .
< div class = "highlight" > < pre > < span > < / span > < code > < span class = "c1" > # /etc/network/interfaces< / span >
< span class = "c1" > # This file describes the network interfaces available on your system< / span >
< span class = "c1" > # and how to activate them. For more information, see interfaces(5).< / span >
< span class = "na" > source /etc/network/interfaces.d/*< / span >
< span class = "c1" > # The loopback network interface< / span >
< span class = "na" > auto lo< / span >
< span class = "na" > iface lo inet loopback< / span >
< span class = "c1" > # The primary network interface< / span >
< span class = "na" > allow-hotplug enp1s0< / span >
< span class = "na" > iface enp1s0 inet dhcp< / span >
< span class = "c1" > # The primary network interface< / span >
< span class = "na" > allow-hotplug enp7s0< / span >
< span class = "na" > iface enp7s0 inet dhcp< / span >
< span class = "na" > auto enp8s0< / span >
< span class = "na" > iface enp8s0 inet static< / span >
< span class = "na" > address 10.4.4.1< / span >
< span class = "na" > network 10.4.4.0< / span >
< span class = "na" > netmask 255.255.255.0< / span >
< span class = "na" > broadcast 10.4.4.255< / span >
< / code > < / pre > < / div > < / p >
< h3 id = "backup-etcdnsmasqconf" > Backup < code > /etc/dnsmasq.conf< / code > < / h3 >
< p > This is a simple bash command that tests if < code > /etc/dnsmasq.conf.bak< / code >
exists, and if not creates it. (only applies to the two router clients)< / p >
< h3 id = "configure-dnsmasq" > Configure < code > dnsmasq< / code > < / h3 >
< p > This task copies the templates for < code > /etc/dnsmasq.conf< / code > to each of
the two router clients.< / p >
< p > < code > dnsmasq< / code > is used to provide < em > DHCP< / em > (and name resolution).
For instance, here is the new < code > /etc/dnsmasq.conf< / code > for < em > dnetone< / em > .
< div class = "highlight" > < pre > < span > < / span > < code > < span class = "c1" > # /etc/dnsmasq.conf< / span >
< span class = "na" > dhcp-range< / span > < span class = "o" > =< / span > < span class = "s" > 10.5.5.50,10.5.5.150< / span >
< span class = "na" > listen-address< / span > < span class = "o" > =< / span > < span class = "s" > 127.0.0.1, 10.5.5.1< / span >
< / code > < / pre > < / div > < / p >
< h3 id = "configure-network-ifup" > Configure Network < em > ifup< / em > < / h3 >
< p > This applies to all the lab clients except for the first one,
changes the default route. A bash script is copied from
template to < code > /etc/network/if-up.d/ifup-script< / code > .< / p >
< p > For instance here is < code > ifup-script< / code > for < em > dnetthree< / em > .
< div class = "highlight" > < pre > < span > < / span > < code > < span class = "ch" > #!/bin/bash< / span >
< span class = "c1" > # /etc/network/if-up.d/ifup-script< / span >
< span class = "nv" > default_dev< / span > < span class = "o" > =< / span > < span class = "s2" > " < / span > < span class = "k" > $(< / span > ip route < span class = "p" > |< / span > head -1 < span class = "p" > |< / span > awk < span class = "s1" > ' {print $5}' < / span > < span class = "k" > )< / span > < span class = "s2" > " < / span >
< span class = "nb" > echo< / span > < span class = "s2" > " < / span > < span class = "si" > ${< / span > < span class = "nv" > default_dev< / span > < span class = "si" > }< / span > < span class = "s2" > " < / span >
< span class = "k" > if< / span > < span class = "o" > [< / span > < span class = "s2" > " < / span > < span class = "si" > ${< / span > < span class = "nv" > default_dev< / span > < span class = "si" > }< / span > < span class = "s2" > " < / span > < span class = "o" > ==< / span > < span class = "s2" > " enp1s0" < / span > < span class = "o" > ]< / span >
< span class = "k" > then< / span >
ip route del default via < span class = "m" > 10< / span > .55.44.1 dev enp1s0
< span class = "k" > fi< / span >
< span class = "k" > if< / span > < span class = "o" > [< / span > < span class = "s2" > " < / span > < span class = "si" > ${< / span > < span class = "nv" > default_dev< / span > < span class = "si" > }< / span > < span class = "s2" > " < / span > !< span class = "o" > =< / span > < span class = "s2" > " enp7s0" < / span > < span class = "o" > ]< / span >
< span class = "k" > then< / span >
ip route add default via < span class = "m" > 10< / span > .4.4.1 dev enp7s0
< span class = "k" > fi< / span >
< / code > < / pre > < / div > < / p >
< h3 id = "restart-network-and-dnsmasq" > Restart Network and < code > dnsmasq< / code > < / h3 >
< p > This is sequential:< / p >
< ol >
2021-10-18 03:37:28 -07:00
< li > < em > enp7s0< / em > is restarted on < em > dnetone< / em > < / li >
2021-10-18 03:27:50 -07:00
< li > < code > dnsmasq< / code > is restarted on < em > dnetone< / em > , offering service on < em > enp7s0< / em > < / li >
< li > < em > enp7s0< / em > and < em > enp8s0< / em > are restarted on < em > dnettwo< / em > , thus soliciting dhcp service on < em > enp7s0< / em > , and triggering < code > /etc/network/if-up.d/ifup-script< / code > < / li >
< li > < code > dnsmasq< / code > is restarted on < em > dnettwo< / em > , offering service on < em > enp8s0< / em > < / li >
< li > < em > enp7s0< / em > is restarted on < em > dnetthree< / em > , < em > dnetfour< / em > , and < em > dnetfive< / em > , thus soliciting dhcp service on < em > enp7s0< / em > , and triggering < code > /etc/network/if-up.d/ifup-script< / code > < / li >
< / ol >
< h3 id = "backup-etcsysctlconf" > Backup < code > /etc/sysctl.conf< / code > < / h3 >
< p > This is a simple bash command that tests if < code > /etc/sysctl.conf.bak< / code >
exists, and if not creates it. (only applies to the two router clients)< / p >
< h3 id = "enable-ipv4-forwarding" > Enable < em > ipv4 forwarding< / em > < / h3 >
< p > This is a simple bash command that uncomments the option for < em > ipv4 forwarding< / em >
in < code > /etc/sysctl.conf< / code > , applies only to the two routers.
< div class = "highlight" > < pre > < span > < / span > < code > < span class = "c1" > # /etc/sysctl.conf< / span >
< span class = "na" > ...< / span >
< span class = "c1" > # this< / span >
< span class = "c1" > #net.ipv4.ip_forward=1< / span >
< span class = "na" > ...< / span >
< span class = "c1" > # becomes this< / span >
< span class = "na" > net.ipv4.ip_forward< / span > < span class = "o" > =< / span > < span class = "s" > 1< / span >
< span class = "na" > ...< / span >
< / code > < / pre > < / div > < / p >
< h3 id = "start-ipv4-forwarding" > Start < em > ipv4 forwarding< / em > < / h3 >
< p > This simple bash command starts < em > ipv4 forwarding< / em > , applies only
to the two routers.
< div class = "highlight" > < pre > < span > < / span > < code > bash -c < span class = "s2" > " sysctl -w net.ipv4.ip_forward=1" < / span >
< / code > < / pre > < / div > < / p >
< h3 id = "configure-iptables-workaround" > Configure < code > iptables< / code > < em > workaround< / em > < / h3 >
< p > This applies only to the two router clients.
From < code > iptables< / code > 's point of view, the ansible connection isn't a RELATED INPUT
connection, thus it is necessary to bring up a firewall in a two-step
process that involves first ACCEPTING RELATED OUTPUT connections in a workaround.< / p >
< p > From ansible template, the following is copied to < code > /dev/shm/iptables_workaround< / code >
< div class = "highlight" > < pre > < span > < / span > < code > # /dev/shm/iptables_workaround
*filter
:INPUT ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
-A INPUT -j ACCEPT -m conntrack --ctstate ESTABLISHED,RELATED
-A OUTPUT -j ACCEPT -m conntrack --ctstate ESTABLISHED,RELATED
COMMIT
< / code > < / pre > < / div > < / p >
< h3 id = "apply-iptables-workaround" > Apply < code > iptables< / code > < em > workaround< / em > < / h3 >
< p > This applies only to the two router clients.
The following command is dispatched to apply the above < em > iptables_workaround< / em > :
< div class = "highlight" > < pre > < span > < / span > < code > bash -c < span class = "s2" > " iptables-restore < /dev/shm/iptables_workaround" < / span >
< / code > < / pre > < / div > < / p >
< h3 id = "configure-iptables" > Configure < code > iptables< / code > < / h3 >
< p > This applies only to the two router clients.< / p >
< p > From ansible template the following is copied to < code > /etc/iptables/rules.v4< / code > on < em > dnetone< / em > .
< div class = "highlight" > < pre > < span > < / span > < code > *nat
-A POSTROUTING -o enp1s0 -j MASQUERADE
COMMIT
*filter
-A INPUT -i lo -j ACCEPT
# allow ssh, so that we do not lock ourselves
-A INPUT -i enp1s0 -p tcp -m tcp --dport 22 -j ACCEPT
# allow incoming traffic to the outgoing connections,
# et al for clients from the private network
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
# prohibit everything else incoming
-A INPUT -i enp1s0 -j DROP
COMMIT
< / code > < / pre > < / div > < / p >
< p > From ansible template the following is copied to < code > /etc/iptables/rules.v4< / code > on < em > dnettwo< / em > .
< div class = "highlight" > < pre > < span > < / span > < code > *nat
-A POSTROUTING -o enp7s0 -j MASQUERADE
COMMIT
*filter
-A INPUT -i lo -j ACCEPT
# allow ssh, so that we do not lock ourselves
-A INPUT -i enp7s0 -p tcp -m tcp --dport 22 -j ACCEPT
# allow incoming traffic to the outgoing connections,
# et al for clients from the private network
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
# prohibit everything else incoming
-A INPUT -i enp7s0 -j DROP
COMMIT
< / code > < / pre > < / div > < / p >
< h3 id = "apply-iptables-firewall" > Apply < code > iptables< / code > firewall< / h3 >
< p > This applies only to the two router clients.
The following command is dispatched to apply the above from < code > /etc/iptables/rules.v4< / code > :
< div class = "highlight" > < pre > < span > < / span > < code > bash -c < span class = "s2" > " iptables-restore < /etc/iptables/rules.v4" < / span >
< / code > < / pre > < / div > < / p >
< h3 id = "traceroute-test" > < code > traceroute< / code > test< / h3 >
< p > The following script is dispatched to < em > dnettwo< / em > :
< div class = "highlight" > < pre > < span > < / span > < code > < span class = "ch" > #!/bin/bash< / span >
< span class = "nv" > RESULT< / span > < span class = "o" > =< / span > < span class = "s2" > " < / span > < span class = "k" > $(< / span > traceroute < span class = "m" > 8< / span > .8.8.8< span class = "k" > )< / span > < span class = "s2" > " < / span >
< span class = "nv" > FIRST_HOP< / span > < span class = "o" > =< / span > < span class = "s2" > " < / span > < span class = "k" > $(< / span > < span class = "nb" > echo< / span > < span class = "s2" > " < / span > < span class = "si" > ${< / span > < span class = "nv" > RESULT< / span > < span class = "si" > }< / span > < span class = "s2" > " < / span > < span class = "p" > |< / span > head -2 < span class = "p" > |< / span > tail -1 < span class = "p" > |< / span > awk < span class = "s1" > ' {print $2}' < / span > < span class = "k" > )< / span > < span class = "s2" > " < / span >
< span class = "k" > if< / span > < span class = "o" > [< / span > < span class = "s2" > " < / span > < span class = "si" > ${< / span > < span class = "nv" > FIRST_HOP< / span > < span class = "si" > }< / span > < span class = "s2" > " < / span > < span class = "o" > ==< / span > < span class = "s2" > " 10.5.5.1" < / span > < span class = "o" > ]< / span >
< span class = "k" > then< / span >
< span class = "nb" > exit< / span > < span class = "m" > 0< / span >
< span class = "k" > else< / span >
< span class = "nb" > exit< / span > < span class = "m" > 1< / span >
< span class = "k" > fi< / span >
< / code > < / pre > < / div >
The following script is dispatched to < em > dnetthree< / em > , < em > dnetfour< / em > , and < em > dnetfive< / em > :
< div class = "highlight" > < pre > < span > < / span > < code > < span class = "ch" > #!/bin/bash< / span >
< span class = "nv" > RESULT< / span > < span class = "o" > =< / span > < span class = "s2" > " < / span > < span class = "k" > $(< / span > traceroute < span class = "m" > 8< / span > .8.8.8< span class = "k" > )< / span > < span class = "s2" > " < / span >
< span class = "nv" > FIRST_HOP< / span > < span class = "o" > =< / span > < span class = "s2" > " < / span > < span class = "k" > $(< / span > < span class = "nb" > echo< / span > < span class = "s2" > " < / span > < span class = "si" > ${< / span > < span class = "nv" > RESULT< / span > < span class = "si" > }< / span > < span class = "s2" > " < / span > < span class = "p" > |< / span > head -2 < span class = "p" > |< / span > tail -1 < span class = "p" > |< / span > awk < span class = "s1" > ' {print $2}' < / span > < span class = "k" > )< / span > < span class = "s2" > " < / span >
< span class = "k" > if< / span > < span class = "o" > [< / span > < span class = "s2" > " < / span > < span class = "si" > ${< / span > < span class = "nv" > FIRST_HOP< / span > < span class = "si" > }< / span > < span class = "s2" > " < / span > !< span class = "o" > =< / span > < span class = "s2" > " 10.4.4.1" < / span > < span class = "o" > ]< / span >
< span class = "k" > then< / span >
< span class = "nb" > exit< / span > < span class = "m" > 1< / span >
< span class = "k" > fi< / span >
< span class = "nv" > SECOND_HOP< / span > < span class = "o" > =< / span > < span class = "s2" > " < / span > < span class = "k" > $(< / span > < span class = "nb" > echo< / span > < span class = "s2" > " < / span > < span class = "si" > ${< / span > < span class = "nv" > RESULT< / span > < span class = "si" > }< / span > < span class = "s2" > " < / span > < span class = "p" > |< / span > head -3 < span class = "p" > |< / span > tail -1 < span class = "p" > |< / span > awk < span class = "s1" > ' {print $2}' < / span > < span class = "k" > )< / span > < span class = "s2" > " < / span >
< span class = "k" > if< / span > < span class = "o" > [< / span > < span class = "s2" > " < / span > < span class = "si" > ${< / span > < span class = "nv" > SECOND_HOP< / span > < span class = "si" > }< / span > < span class = "s2" > " < / span > < span class = "o" > ==< / span > < span class = "s2" > " 10.5.5.1" < / span > < span class = "o" > ]< / span >
< span class = "k" > then< / span >
< span class = "nb" > exit< / span > < span class = "m" > 0< / span >
< span class = "k" > else< / span >
< span class = "nb" > exit< / span > < span class = "m" > 1< / span >
< span class = "k" > fi< / span >
< / code > < / pre > < / div > < / p >
< h2 id = "to-be-continued" > To Be Continued< / h2 >
< p > In < a href = "/posts/ansible-kvm-router-lab-part-6/" target = "_blank" > Ansible KVM Router Lab Part 6< / a > ,
I explain
< a href = "https://github.com/TrentSPalmer/router-lab/blob/master/disconnect_vms_from_bridges.bash" target = "_blank" > disconnect_vms_from_bridges.bash< / a > ,
< a href = "https://github.com/TrentSPalmer/router-lab/blob/master/undefine_and_remove_vms.bash" target = "_blank" > undefine_and_remove_vms.bash< / a > ,
and < a href = "https://github.com/TrentSPalmer/router-lab/blob/master/remove_bridge_networks.bash" target = "_blank" > remove_bridge_networks< / a >
which are used to destroy the lab.< / p >
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