How to enable an IPv6 management address on a Ubiquiti AirFiber

airfiber-mgmt-ipv6.md

Enabling IPv6 management address on AirFiber

In order to be able to have a management IPv6 address assigned on the br0 interface of a Ubiquiti AirFiber, there is a hacky way to do it.

Login via SSH to execute the commands

Steps

• Restart bridge interface, so /proc/sys/net/ipv6/conf/br0 is available
• Disable duplicate address detection on bridge
  • The behavior of the bridge will cause it to always detect a duplicate address
• Enable IPv6 on bridge

Temporary (will not survive reboot)

ip link set br0 down; ip link set br0 up  # one line so you don't lock yourself out!
sysctl -w net.ipv6.conf.br0.dad_transmits=0
sysctl -w net.ipv6.conf.br0.accept_dad=0
sysctl -w net.ipv6.conf.br0.disable_ipv6=0

Permanent (survives reboots)

• Create scripts in /etc/persistent (content below)
  • /etc/persistent/rc.poststart
  • /etc/persistent/setup-ipv6-mgmt
• Make script executable: chmod +x /etc/persistent/setup-ipv6-mgmt
• Persist to disk cfgmtd -w -p /etc/

Community discussions

• https://community.ubnt.com/t5/airFiber/IPv6/td-p/2412341
• https://community.ubnt.com/t5/airFiber/airOSF-airFiber-and-IPV6-support/td-p/1327941

rc.poststart

/etc/persistent/setup-ipv6-mgmt >> /tmp/ipv6-mgmt.log &

setup-ipv6-mgmt

date

sleep 5

# Bring back sysctl parameters for IPv6
echo "Restarting Bridge..."
ip link set br0 down
ip link set br0 up

echo "Setting values for Bridge..."
echo 0 > /proc/sys/net/ipv6/conf/br0/dad_transmits
echo 0 > /proc/sys/net/ipv6/conf/br0/accept_dad
echo 0 > /proc/sys/net/ipv6/conf/br0/disable_ipv6

touch /tmp/ipv6-mgmt-done