From owner-freebsd-atm  Mon Jun  1 05:41:07 1998
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Date: Mon, 1 Jun 1998 08:40:55 -0400 (EDT)
From: George Uhl <uhl@mamba-e.gsfc.nasa.gov>
Message-Id: <199806011240.IAA26225@mamba-e.gsfc.nasa.gov>
To: freebsd-atm@FreeBSD.ORG, freebsd-hackers@FreeBSD.ORG
Subject: Problems with shadow interface
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I'm running FreeBSD 2.2.2 and I've loaded the latest
ALTQ (1.0.1) onto it.  I'm configuring an ATM
interface to make it multicast capable.

ATM interface en0 configuration:

ifconfig en0 198.119.22.6 netmask 0xfffffffc
route add -iface 198.119.22.5 -link en0:3.0.0.a

Shadow interface pvc0 configuration:

pvcsif en0   (creates pvc0 shadow interface bound to en0)
ifconfig pvc0 198.119.22.6 netmask 0xfffffffc 198.119.22.5
pvctxctl pvc0 0:10 -b 155M  (assigns pvc 10 to pvc0)

When I start mrouted, it finds pvc0 from the kernel and 
assigns it as vif#2. When mrouted installs vif#2 (pvc0) 
from reading the config file and tries to install it, it
bombs with the following messages:

warning - can't join group 224.0.0.4 on interface 198.119.22.6:
can't assign requested address

setsockopt IP_MULTICAST_IF 198.119.22.6: can't assign requested
address

It looks like mrouted cannot handle having the same address
assigned to 2 interfaces even if the second interface is
a pseudo bound to the real interface.

Is anyone else experiencing similar problems the ALTQ ATM
driver?

Thanks,
George Uhl


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