Where is the edge of the Internet?
alok
alok.dube at apara.com
Wed Nov 6 06:24:57 UTC 2002
here is the scenario
u have a bgp A ---ospf-B - bgpC router setup
what will u do on ospf -B ?
coz transit traffic can flow thru it...
"careful selection"... :o) well that way u can fill every hole .. no end to
it... and it generates good jobs :o)
but what i was trying to say to Valdis....was that u cant just "blindly"
drop packets in the core whose source doesnt have a route...for eg ospfB is
a problem in the above
----- Original Message -----
From: Martin <marty at supine.com>
To: <nanog at merit.edu>
Sent: Wednesday, November 06, 2002 11:32 AM
Subject: Re: Where is the edge of the Internet?
$author = "alok" ;
>
> you can't if its a valid internet address...can you?
depends on what you mean by "valid".
- does "valid" = any 32 bit dotted quad?
- does "valid" = any IP not in 1918 space?
- does "valid" = any IP that the routing table has an entry for?
- does "valid" = packets from this IP came in the interface i would send
packets out of to reach that IP?
> but that isnt the case here is it...some of ur internal core
> routers may not have every router running bgp, so what do u do for such
> scenarios..u default route it to a bgp router....im missing your
point.....
"loose" RPF on routers without full tables makes little sense. you choose
where to filter carefully and avoid the pitfalls you keep raising...
marty
--
"No GUI for you! Use lynx!!!, Come back, One year!"
/avant
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