Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sun-barr!olivea!uunet!van-bc!ubc-cs!alberta!atha!aupair.cs.athabascau.ca!lyndon
From: lyndon@cs.athabascau.ca (Lyndon Nerenberg)
Newsgroups: comp.mail.uucp
Subject: Re: What should a new UUUCP do?
Message-ID: <502@aupair.cs.athabascau.ca>
Date: 11 Dec 90 18:19:09 GMT
References: <1CE00001.ab22ep@tbomb.ice.com>
Organization: Athabasca University
Lines: 37

time@tbomb.ice.com (Tim Endres) writes:
>In article <RZ9PT1w163w@bluemoon.uucp>, grant@bluemoon.uucp (Grant DeLorean) writes:
>>  I guess I should go look at the maps before speaking, but why have
>> yourself listed in the maps as connecting to other systems with a
>> full map entry if you don't want mail mapped through you? Since the
>> 
>This is required so that people know how to get mail *to* me as well
>as *through* me. If I don't list the hosts I talk to, you don't know
>how to get to me.

Please read the documentation for pathalias. When you list a site in your
map entry, you are indicating that YOU are willing to forward to THEM, not
the other way around.

There is one, and only one, exception to the above rule. Consider the
following map entries:

	foo	bar(DIRECT)

	bar	mumble(DEMAND),
		frotz(EVENING)

Foo indicates a single connection to bar for their outgoing mail, however
bar does not indicate a reverse connection. In the absence of *any* *other*
connections to foo, pathalias will imply a very high cost route from bar
to foo so that foo is not unreachable from the rest of the net. Note that
this only happens in the case of an isolated leaf node with no advertised
reverse links.

If you want the rest of the net to know about links from other sites TO
you, have those other sites advertise that connection in THEIR map entry.

-- 
    Lyndon Nerenberg  VE6BBM / Computing Services / Athabasca University
        {alberta,cbmvax,mips}!atha!lyndon || lyndon@cs.athabascau.ca
                    Packet: ve6bbm@ve6mc [.ab.can.na]
      The only thing open about OSF is their mouth.  --Chuck Musciano