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List: freebsd-hackers
Subject: natd and multicast tunnel
From: George Uhl <uhl () mamba-e ! gsfc ! nasa ! gov>
Date: 1999-08-30 20:25:46
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I'm running natd on a FreeBSD 3.2 router at home which
receives internet service via a cable modem and provides
translation for a host on the back-end of a 10bT ethernet
LAN. The LAN is configured with the 192.168.1/24 address
space.
I'm using the "non-firewall" setting in
/etc/rc.firewall:
/sbin/ipfw -f flush
/sbin/ipfw add divert natd all from any to any via xl0
/sbin/ipfw add pass all from any to any
Unicast translation works fine. The problem occurs when
providing concurrent multicast service. I'm using mrouted
version 3.9-beta3 and tunneling multicast control traffic
in addition to multicast data.
I can run an sdr session on the back-end LAN host while
running mrouted and natd and receive session advertisements.
However, when I join a multicast session, my router's kernel
panics with a page fault somewhere in the div_input function
of /sys/netinet/ip_divert.c. div_input is called by
ip_output.
When I run mrouted stand-alone (i.e., without natd) the
back-end host can join a session without crashing the router.
I haven't tried to source multicast traffic from the
back-end host since that should require natd to translate
the source address. Is there a way to bypass natd for
incoming tunneled multicast traffic? Outgoing multicast
streams would still need to be translated prior to
tunneling, right?
Please reply via e-mail as I am not subscribing to these
lists.
Thanks,
George Uhl
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