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Subject: Re: Routing problem with udp, and a multihomed host in 2.4.20
In-Reply-To: message from Herbert Xu on Saturday February 15
References: <15948.13879.734412.313081@notabene.cse.unsw.edu.au>
<E18jpaa-0007Rc-00@gondolin.me.apana.org.au>
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--text follows this line--
On Saturday February 15, herbert@gondor.apana.org.au wrote:
> Neil Brown <neilb@cse.unsw.edu.au> wrote:
> >
> > It turns out that the problem occurs when send_msg is used to send a
> > UDP packet, and the control information contains
> > struct in_pktinfo {
> > unsigned int ipi_ifindex; /* Interface index */
> > struct in_addr ipi_spec_dst; /* Local address */
> > struct in_addr ipi_addr; /* Header Destination address */
> > };
> > specifying the address and interface of the message that we are
> > replying to.
>
> So your application is forcing the packet to go out on a specific
> interface bypassing the routing table...

No.
My application (which is just using standard rpc server libraries) is
saying
"This is in reply to a request that came in through a given
interface".

It is not reasonable to treat that statement as equivalent to:
"This packet must go out that interface"

which is what appears to be happening.

NeilBrown


> --
> Debian GNU/Linux 3.0 is out! ( http://www.debian.org/ )
> Email: Herbert Xu ~{PmV>HI~} <herbert@gondor.apana.org.au>
> Home Page: http://gondor.apana.org.au/~herbert/
> PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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