From: P729 (p729@cox.net)
Date: Fri Apr 23 2004 - 22:23:04 GMT-3
...and read 7.4.
Regards,
Mas Kato
https://ecardfile.com/id/mkato
----- Original Message -----
From: "David Hiers" <David_Hiers@adp.com>
To: <ccielab@groupstudy.com>
Sent: Friday, April 23, 2004 3:06 PM
Subject: RE: RFC 1812 " Requirements for IP Version 4 Routers" ??
> This sure sounds like a homework problem. If your boss (or whatever) is
going to try to read an RFC, he needs to learn how to do it properly.
>
> 1. Read the entire RFC
> 2. Understand the meaning of the word "can" in 5.2.4.2.2.c
> 3. Quit ignoring 2.2.5.2 and 5.2.4.3
>
> David
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> BALAKRISHNAN Balaji
> Sent: Friday, April 23, 2004 10:30 AM
> To: ccielab@groupstudy.com
> Subject: RFC 1812 " Requirements for IP Version 4 Routers" ??
>
>
> Hi group,
>
> I have a clarification on RFC1812 about route forwarding decision..
>
> When a router received a packet, if the destination ip is part of its
> directly connected interface subnet , it will do the arp request for
> that destination ip out to that interface. Now, we can change that
> behavior by configuring more specific route for that destination ( say
> /32 host route) pointing to different gateway. On this case, router
> forwards the packet to the next-hop defined. right ???
>
> But my manager don't agree with that. He says if destination IP address
> in the packet is on the same subnet as any Ethernet interface of the
> router, then the router should not do any route lookup at all, and must
> immediately forward the packet on that matching interface . Ie. more
> specific route present in the router's routing table is then not
> relevant. He pointing to the RFC 1812 section "5.2.4.2 Local/Remote
> decision ". The section goes line this ..the following algorithm MUST be
> used to determine if the Immediate Destination is directly accessible
> quote
> * isolate the network prefix used by the interface.
> * Isolate the corresponding set of bits from the IP Destination
> Address of the packet.
> * Compare the resulting network prefixes. If they are equal to each
> other, the packet can be transmitted through the corresponding network
> interface.
> * If the destination was not a member of a directly connected network
> prefix, the IP Destination is accessible only through some other
> router.
> unquote
>
> I believe it does not consider all the possibilities for a route
> decision. Do anybody know better RFC reference that I can point to my
> manager to prove that I am right ???
>
> - bala.
>
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