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Date:	Wed, 27 Aug 2014 19:11:14 +0530
From:	Tushar Shinde <>
To:	Hannes Frederic Sowa <>
Subject: Re: IPv6 Policy based routing not working.

ping6 command uses SO_BINDTODEVICE but it looks it is not working. The
source address in fib6 rule match is 0:::0

strace ping6 -I eth0 2001:2::20 2> t
setsockopt(4, SOL_SOCKET, SO_BINDTODEVICE, "eth0\0", 5) = 0
connect(4, {sa_family=AF_INET6, sin6_port=htons(1025),
inet_pton(AF_INET6, "2001:2::20", &sin6_addr), sin6_flowinfo=0,
sin6_scope_id=0}, 28) = -1 ENETUNREACH (Network is unreachable)

I think there is problem with so_binddevice. need to dig further.


On Wed, Aug 27, 2014 at 11:35 AM, Hannes Frederic Sowa
<> wrote:
> On Mi, 2014-08-27 at 11:32 +0530, Tushar Shinde wrote:
>> So do we need to always use ipv6 address to bind unlike ipv4?
> No, I think SO_BINDTODEVICE should work. But ping6 does not use it, so
> one could add support for this to ping with a new option.
> ping6 uses cmsg with undefined ipv6 source address but set ifindex and
> that's not at all like SO_BINDTODEVICE.
> Bye,
> Hannes
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