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SubjectRe: Routing problem with udp, and a multihomed host in 2.4.20
Date
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...
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