IPv6 Static Router

This activity creates statically configured IPv6 routing in r1 and r2. These routers are placed in an inter-network hierarchy and IPv6 traffic is observed as it is routed between the networks.

Deliverable

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Setup

Three distinct networks should already be in places from previous milestones, arranged in the topology described below:

  • Host-Only network #2:
    • the host
    • border router (border_rtr)
    • router #1 (r1)
    • router #2 (r2)
  • net1 created by joining the internal networks net1a and net1b with a bridge:
    • router #1 (r1)
    • web
    • ws1
  • net2:
    • router #2 (r2)
    • ws2

Router configuration

Configuration steps

  1. IPv6 configuration of router interfaces: enp0s3 and br0 for r1, enp0s3 and enp0s8 for r2
  2. Enable IPv6 forwarding
  3. Configure IPv6 routes

r1 configuration

Tools

You may use the nmtui tool to complete this task. If you prefer the nmcli command line tool, the command hints at the end of this section may be of help.

  • enp0s3 IPv6 configuration is as follows:

    • Address: FD00:A:1A:14::64/64
    • Method: manual
    • Route to net2: FD00:C0:A8:C8::/64 via FD00:A:1A:14::C8

  • br0 IPv6 configuration is as follows:

    • Address: FD00:C0:A8:64::1/64
    • Method: manual

  • Enable IPv6 forwarding, edit the following file: /etc/sysctl.conf and add the following line at the bottom of the file:

net.ipv6.conf.all.forwarding = 1
  • To activate the changes, run:
sudo sysctl --system

With single command

Alternatively, you can do all the above using a single command:

echo "net.ipv6.conf.all.forwarding = 1" | sudo tee -a /etc/sysctl.conf && sudo sysctl --system

r2 configuration

Tools

You may use the nmtui tool to complete this task. If you prefer the nmcli command line tool, the command hints at the end of this section may be of help.

  • enp0s3 IPv6 configuration is as follows:
    • Address: FD00:A:1A:14::C8/64
    • Method: manual
    • Route to net1: FD00:C0:A8:64::/64 via FD00:A:1A:14::64
  • enp0s8 IPv6 configuration is as follows:
    • Address: FD00:C0:A8:C8::1/64
    • Method: manual
  • Enable IPv6 forwarding, edit the following file: /etc/sysctl.conf and add the following line at the bottom of the file:
net.ipv6.conf.all.forwarding = 1
  • To activate the changes, run:
sudo sysctl --system

Hosts configuration

Tools

You may use the nmtui tool to complete this task. If you prefer the nmcli command line tool, the command hints at the end of this section may be of help.

  • web and ws1 IPv6 configuration
    • web Address: FD00:C0:A8:64::A/64
    • ws1 Address: FD00:C0:A8:64::14/64
    • method: manual
    • gateway: FD00:C0:A8:64::1
  • ws2 IPv6 configuration
    • Address: FD00:C0:A8:C8::A/64
    • method: manual
    • gateway: FD00:C0:A8:C8::1


Command hints

Add IPv6 address to an interface:

sudo nmcli con modify [name_of_connection] ipv6.addresses [address]/[cidr] ipv6.method manual

Add IPv6 address and default gateway to an interface:

sudo nmcli con modify [name_of_connection] ipv6.addresses [address]/[cidr] ipv6.method manual ipv6.gateway default_gateway_addr

Add IPv6 route to an interface:

sudo nmcli con modify [name_of_connection] +ipv6.routes "destination_netID next_hop"

Refresh configuration:

sudo nmcli con up [name_of_connection]

Troubleshooting

  • Verify that links are active: ip link show
  • Verify IP address on interfaces: ip -6 addr
  • Verify routing configuration: ip -6 route show
  • Test connectivity and routing (you can also just use ping6):
    • In web: sudo traceroute6 -I fd00:c0:a8:64::1
    • In web: sudo traceroute6 -I fd00:a:1a:14::64
    • In web: sudo traceroute6 -I fd00:a:1a:14::c8
    • In web: sudo traceroute6 -I fd00:c0:a8:c8::1
    • In web: sudo traceroute6 -I fd00:c0:a8:c8::a
    • In ws2: do the reverse of the previous traces