IP_PKTINFO, sendmsg(2) and routing.

To: tech-net%netbsd.org@localhost
Subject: IP_PKTINFO, sendmsg(2) and routing.
From: Roy Marples <roy%marples.name@localhost>
Date: Fri, 8 Feb 2019 17:19:40 +0000

Hi List

Whilst traking down a dhcpcd issue for Jared it occured to me that myuse of IP_PKTINFO might not be ideal for NetBSD. Here's the scenario:


interface a: 192.168.0.101/24
interface b: 192.168.0.102/24

The route to 192.168.0.255 belongs on interface a.

If I send a UDP packet to 192.168.0.1 it will by default leave byinterface a.My question is this - should IP_PKTINFO allow the same message to leaveby interface b - ie effectively bypassing the routing table?

Roy

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