Path: utzoo!attcan!uunet!husc6!mailrus!nrl-cmf!ames!pasteur!ucbvax!ncnoc.tucc.edu!jrr
From: jrr@ncnoc.tucc.edu (Joe Ragland)
Newsgroups: comp.sys.proteon
Subject: Re: p4200 routing
Message-ID: <8812282011.AA09937@ncnoc.tucc.edu>
Date: 28 Dec 88 20:11:33 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 33

Hello Mark (Fedor this time, not Oros):

Yea, ain't running a gateway wonderful.  Before last Fall when we lost
our ARPANET line we occasionally got somebody's syslog records, usually
from some SURANET site.  Guess advertising default is like asking your
neighbors (near and far) for their IP garbage.  If you don't know where
to send it, then send it here and maybe we'll do something with it!
We might even answer your localhost telnet request...  Gateways have 
got to be rather tough beasts, prepared for whatever.

This CMU-TEK IP may be broken but it sure is not mine eventhough I have
to deal with the results.  With seven campuses in seven cities, over a
1000 hosts (don't count PCs) I have enough trouble keeping up with the
various LAN administrators (their name, telephone number, and e-mail
address).  Make no attempt to keep up with host administrators.

When I get back at my office next week I'll take a close look at RFC
1009 but it seems you have conveyed the essence rather clear.  How the
p4200 complies leaves some room for opinion.  Without my p4200
documentation in hand I seem to recall the filter mechanism works only
for explicit IP addresses, not network classes.  That is you can filter
127.0.0.1, 127.0.0.2, etc. but can not filter all possible 127
addresses by filtering for 127.0.0.0.  If this is the case then some
situations would be more difficult to specify.  However, loopback in most
Unix implementations is explicitly 127.0.0.1 as far as I know.

Yes, some discussion in the p4200 user's manual on specific internet
filtering would be appropriate.  But, I would prefer the default be   
something other than forwarding packets destined for 127.0.0.1 without
a whimper.

Happy New Year,
Joe