[53238] in North American Network Operators' Group

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Re: Where is the edge of the Internet?

daemon@ATHENA.MIT.EDU (Martin)
Wed Nov 6 01:04:03 2002

Date: Wed, 6 Nov 2002 17:02:39 +1100
To: nanog@merit.edu
In-Reply-To: <00a601c28558$e92f4280$81c802c0@alok>
From: marty@supine.com (Martin)
Errors-To: owner-nanog-outgoing@merit.edu


$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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