From: Curtis Phillips (phillipscurtis@xxxxxxxxxxxx)
Date: Fri Sep 01 2000 - 16:58:12 GMT-3
I think it depend on the particualar TCP/IP stack implementation.
Some stacks create a queue for the local/logical interface and treat it
exactly as they would a packet recieved and queued from a physical interface.
So, if the stack was processing input in a round-robin fashion it would read
the packet for the logical interface in sequence, along with the other
interface queues. The packet would never see the wire though and would be
written from the output queue for that logical interface to teh input queue
and passed up the stack to the process named in the proto field.
Again, this is one concept. It may be done differently in other stacks.
Curtis
"Roger Wang" <rwang@genuity.net> wrote:
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I sometimes wonder that myself, but I don't know the answer. What I do know
is that it has to do with layer 2 encap types. For example, frame relay
interfaces - if it's a point-to-point sub-interface, a "map" statement won't
be necessary and can't (frame-relay interface-dlci) to ping the local
interface; otherwise, you'll need a "map" statement to the local interface
in order to ping it (packets go to the other end and back). The same goes
to X25 encap, I think.
HTH,
Rog
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
damien
Sent: Friday, September 01, 2000 1:19 PM
To: ccielab@groupstudy.com
Subject: Somebody must know the answer
3rd time to post....!!!
Can anybody tell me exactly what happens in terms of the IP stack on the
Router, when you ping an Ethernet local interface and a Serial ptp
Interface.........i.e. the packet is generated by the Router to ping its
own interface.........where exactly the packet goes........or software
instructions that are carried out..........
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