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Joe
Asked: 2019-06-28 08:38:14 +0800 CST

Debian 9 - IPV6 not assigning

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Simple task: I've assigned a V6 address to a debian9 box, but its not applying to the interface on reboot. The V4 address is applying. If i assign it manually using ip -6 addr add <ipv6address>/<prefixlength> dev <interface> then it works fine. Here's a copy of my /etc/network/interfaces config

'# The loopback network interface
auto lo
iface lo inet loopback
iface lo inet6 loopback

'# The primary network interface
allow-hotplug eth0
iface eth0 inet static
address 10.190.xxx.xxx/26
gateway 10.190.xxx.xxx
up route add -net 10.100.xx.xxx/32 gw 10.190.xxx.xxx dev eth0
# dns-* options are implemented by the resolvconf package, if installed
dns-nameservers 8.8.8.8 4.2.2.2

iface eth0 inet6 static
address 2607:f0x0:xxxx:ac::20
netmask 64
gateway 2607:f0x0:xxxx:ac::2

debian

2 Answers

  1. If you use ifupdown2 package, try to install ifupdown instead. This fixed the issue for me.

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  2. You just need one stanza for an interface with ifupdown2:

    # The primary network interface
auto eth0
iface eth0
    address 10.190.xxx.xxx/26
    gateway 10.190.xxx.xxx
    address 2607:f0x0:xxxx:ac::20/64
    gateway 2607:f0x0:xxxx:ac::2 
    dns-nameservers 9.9.9.9 149.112.112.112
    post-up ip route add 10.100.xx.xxx/32 via 10.190.xxx.xxx dev eth0

    The config file "/etc/network/interfaces" is not quite the same for ifupdown and ifupdown2. There is a comparison at cumulus network of some differences.

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