Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!cs.utexas.edu!tut.cis.ohio-state.edu!husc6!rice!sun-spots-request
From: dupuy@cs.columbia.edu
Newsgroups: comp.sys.sun
Subject: Phantom "ip0" interface on SunOS 3.x
Keywords: SunOS
Message-ID: <4100@kalliope.rice.edu>
Date: 21 Jun 89 18:12:58 GMT
Sender: usenet@rice.edu
Organization: Sun-Spots
Lines: 12
Approved: Sun-Spots@rice.edu
X-Sun-Spots-Digest: Volume 8, Issue 48, message 13 of 19

Using the SIOCGCONF ioctl to get the interfaces on a Sun running 3.x
returns a phantom third interface, "ip0", which can be queried with the
ifconfig program:

$ ifconfig ip0
ip0: 0.0.0.0 flags=0<>

This seems to be created in the ip_init() routine in ip_input.c.  Does
anybody have any idea why?  Neither SunOS 4.0 or 4.3 bsd do this.  Is it a
4.2 relic?

@alex