Re: Where is the edge of the Internet?

["alok" <alok.dube () apara com>]

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 () supine com>
To: <nanog () 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