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When I try to add an IP rule for IPv6 on my Linux system, it errors out:

$ ip -6 rule add fwmark 0xfab lookup 0xf RTNETLINK answers: Address family not supported by protocol

I checked out the IP rule code; it issues a netlink message to the kernel. Probably I need to load some module, but I don't know which. What do I need to do to fix this?

I am using linux 2.6.37.3 built from kernel sources

Solution: By default linux build doesn't support multiple routing tables for IPv6. You need to enable CONFIG_IPV6_MULTIPLE_TABLES for multiple IPv6 routing table support.

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  • Solution given in question works. Commented Mar 29, 2013 at 22:11

2 Answers 2

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IPv6 functionality is available to the system by the ipv6 kernel module. To check if this module is currently loaded in your system, issue the following command as root:

lsmod | grep ipv6

If you see ipv6 in its output, then the module is loaded.

Check your /etc/modprobe.conf and see if ipv6 is disabled.

alias ipv6 off options ipv6 disable=1

It should be

alias net-pf-10 ipv6

Further check the interface specific configuration file: (If you are using a RedHat style distribution like Fedora, CentOS etc.,)

In /etc/sysconfig/network-scripts/ifcfg-eth0

IPV6INIT=yes IPV6_AUTOCONF=yes

In /etc/sysconfig/network file, if it exists:

NETWORKING_IPV6=yes

And then restart network service And restart the system for cleanly loading the ipv6 kernel module.

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  • Nikhil, In fact Ipv6 is enabled in my linux box, and I have configured Ipv6 address too. Everything works fine , but I am trying to add an ip rule for Ipv6 which is failing. Commented Jan 4, 2012 at 7:21
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I don't see lookup as a valid option to any ip object. Action for rules include table, nat, prohibit recject, unreachable or realms. From the form of your command I expect you want table. Try 

ip -6 rule add fwmark 0xfab table 0xf
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