This gist describes how to setup a hurricane electric (TunnelBroker) IPv6 tunnel on a Ubiquiti Unifi Dream Machine Pro

udm-pro-he-ipv6-setup.md

Setup IPv6 Tunnel on Unifi Dream Machine Pro

Enable SSH

TODO

Configure To Dream Machine Over SSH

SSH to your UDM

ssh root@<udm ip address>
<enter the password you set when prompted>

Configure the IPv6 Tunnel - You get the addresses from the Tunnel Details page on TunnelBroker

ip tunnel add he-ipv6 mode sit remote <server ipv4 address> local <client ipv4 address> ttl 255
ip link set he-ipv6 up
ip addr add <client ipv6 address> dev he-ipv6
ip route add ::/0 dev he-ipv6
ip -f inet6 addr

Test Connectivity from UDM

ping 2600::

Setup Address Allocation

TODO

Okay so i found a fix, this is what i did

Set the he-ipv6 mtu to 1422

ip link set mtu 1422 dev he-ipv6

Delete the route to br0

ip route del <HE IPv6 client address>/64 dev br0

Then re added it using this

ip route add <HE IPv6 client address>/64 dev br0 mtu 1280

http://test-ipv6.com/index.html.en_US gives me 10/10

for some reason the udm set a route with a metric of 256 but the default for the default is 1024 so large packets failed

This is before

<HE IPv6 client address>/64 dev br0 proto kernel metric 256 pref medium
default dev he-ipv6 metric 1024 mtu 1422 pref medium

Glad you got that figured out and thanks for sharing!! Are you using pppoe for your WAN?

Yes i am using ppp0