From: Brian Edwards (bedwards@xxxxxxxxxxx)
Date: Fri Sep 01 2000 - 15:52:40 GMT-3
I think the question is does the packet actually go out the interface
or is this all done in software. I have heard that P2P ints do send
the packet out (so you can use this to test the circuit). The router
on the other end reads the entire contents of all packets and forwards
it back to the initiating router.
On Ethernet, my guess is that it is done in software. Maybe it sends
out a packet with a broadcast MAC. Pretty easy to find this out "no ip
route-cache" / "debug ip packet" on another router on the Ethernet.
BTW... Juniper always does this in software.
/Brian
-----Original Message-----
From: Roger Wang [mailto:rwang@genuity.net]
Sent: Friday, September 01, 2000 11:16 AM
To: damien; ccielab@groupstudy.com
Subject: RE: Somebody must know the answer
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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