Ubuntu

Stateful IPv6

Asked by Alex Smith

Why Ubuntu not take real stateful IPv6 from OpenWRT? Everytime generated some random IP, instead what I set. I tried disable privacy mode, but it is not help. It's work only after 2 times manual command 'dhclient -6 -i eth0'. Stateless mode is disabled.

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Kai Kasurinen (kai-kasurinen) said : 		#1

Ubuntu 20.04? NetworkManager? ufw? Or something else?

maybe:
https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1882849
https://bugs.launchpad.net/ubuntu/+source/ufw/+bug/1882314

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Alex Smith (diamondfrog) said : 		#2

I found a reason. For bind stateful IPv6 in DHCP must set:

If use systemd-networkd, need open file /etc/systemd/networkd.conf and uncomment "DUIDType=vendor" in "DHCP" section;

If use Network-manager, need open file /etc/NetworkManager/system-connections/your_connection and add "dhcp-duid=stable-uuid" in "ipv6" section

Also, DUID must be bonded for IPv6 device in DHCP options of OpenWRT.