Date: Fri, 28 Jun 2013 20:00:01 GMT From: Mark Linimon <linimon@lonesome.com> To: freebsd-net@FreeBSD.org Subject: Re: kern/179901: [netinet] [patch] Multicast SO_REUSEADDR handled incorrectly Message-ID: <201306282000.r5SK01qp097855@freefall.freebsd.org>
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The following reply was made to PR kern/179901; it has been noted by GNATS.
From: Mark Linimon <linimon@lonesome.com>
To: bug-followup@FreeBSD.org
Cc:
Subject: Re: kern/179901: [netinet] [patch] Multicast SO_REUSEADDR handled
incorrectly
Date: Fri, 28 Jun 2013 14:55:38 -0500
----- Forwarded message from Bernd Walter <ticso@cicely7.cicely.de> -----
Date: Fri, 28 Jun 2013 12:15:14 +0200
From: Bernd Walter <ticso@cicely7.cicely.de>
To: linimon@freebsd.org
Cc: freebsd-bugs@freebsd.org, freebsd-net@freebsd.org
Subject: Re: kern/179901: [netinet] [patch] Multicast SO_REUSEADDR handled incorrectly
User-Agent: Mutt/1.5.11
I don't know if this is related or a different bug, but the same
mentioned commits are suspicious for us.
We had been running with our own IPv6 software into the same REUSEADDR
problem and changed to REUSEPORT as this is how it is done in mcastread
from mcast-tools port.
Don't know where we originally got the REUSEADDR from, probably a Stevens
book.
So far binding works with this change in our software.
However we only receive packets from network and not packets from
the host itself.
We use multicast to notify multiple processes on multiple machines,
including the machine itself.
To reproduce:
- use two hosts
- start mcastread on each of them on an interface with shared LAN
- send via mcastsend on one host
- packets are received on the other host, but not with the mcastread
on the same host
--
B.Walter <bernd@bwct.de> http://www.bwct.de
Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.
----- End forwarded message -----
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