* IP_MULTICAST_LOOP? /Re: Netfilter "sees" locally originated multicast traffic as external-incoming one/
@ 2008-03-23 16:26 Igor M Podlesny
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From: Igor M Podlesny @ 2008-03-23 16:26 UTC (permalink / raw)
To: netfilter
On 23/03/2008, Igor M Podlesny <for.poige+linux.nf@gmail.com> wrote:
> Hello!
>
> Recently my home network got additional network connection, so I
> decided to try using Zebra to see if the whole set-up would be simpler
> and easier to maintain. During the test period I've noticed that
> Netfilter "sees" locally originated multicast traffic as
> external-incoming one:
[...]
> I'm not sure neither whether is this a bug or "feature" nor is this
> Netfilter's bug/feature at all -- more likely it's the kernel's issue.
> May be it's due to RIPv2/Zebra's "glitches"(?). What would you say?
I dug a bit more and can suggest that RIPv2/Zebra sets
IP_MULTICAST_LOOP flag. But then another question arises: is there a
good way to detect such kind a traffic with Netfilter? I mean such a
way that excludes a possibility for bogus traffic being treated as
IP_MULTICAST_LOOP.
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