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?
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
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? 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