I am trying to set both a static ipv4 address and a static ipv6 address on a home hosted Debian 11 server (it's actually just a PC).

Here is my /etc/network/interfaces :

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eno1
iface eno1 inet static
    netmask 24

iface eno1 inet6 static
    address 2a01:xxxx:xxxx:xxxx::1234
    netmask 56
    gateway fe80::712a:e39b:d35a:3ea4

After restarting networking service with `sudo service netowrking restart" Here is the result (exactyly what i want):

sept. 15 00:07:56 omen-debian systemd[1]: Starting Raise network interfaces...
sept. 15 00:08:07 omen-debian ifup[785]: Waiting for DAD... Timed out
sept. 15 00:08:07 omen-debian ifup[637]: ifup: failed to bring up eno1
sept. 15 00:08:07 omen-debian systemd[1]: networking.service: Main process exited, code=exited, status=1/FAILURE
sept. 15 00:08:07 omen-debian systemd[1]: networking.service: Failed with result 'exit-code'.
sept. 15 00:08:07 omen-debian systemd[1]: Failed to start Raise network interfaces.
2: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether c8:d3:ff:e6:b5:59 brd ff:ff:ff:ff:ff:ff
    altname enp5s0
    inet brd scope global eno1
       valid_lft forever preferred_lft forever
    inet6 2a01:xxxx:xxxx:xxxx::1234/56 scope global 
       valid_lft forever preferred_lft forever
    inet6 fe80::cad3:ffff:fee6:b559/64 scope link 
       valid_lft forever preferred_lft forever

As you see my networking service produces an error. What am i doing wrong ?

  • 1
    try to disable IPv6 DAD (Duplicate Address Detection) net.ipv6.conf.<interface name>.accept_dad = 0
    – asktyagi
    Sep 15, 2022 at 4:41
  • @asktyagi Solved it for me, looks like the DAD timeout is too long for systemd to wait?
    – Ale
    Nov 18, 2022 at 15:56


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