Re: First ping response receiving late

Robert Harris <robert.f.harris@xxxxxxxxxxxxxxxx> wrote:
santa19992000@xxxxxxxxx wrote:
I am trying to ping the Gateway which is on RF network, the first ping
response getting delayed, the first response is received after it
sends second ICMP message to destination, this way everytime first
ping response getting delayed. out of 20 pings, only 19 receives in-
time, where as first one comes very late (after it timesout). Any
idea, Is it because it is ICMP message, not a high priority messge,
that is why it might receive late. Thanks in advance.

The first ping will get converted to an ARP if the machine doesn't
already know the MAC address of the gateway.

It isn't converted so much as "will wait for ARP resolution." As would
subsequent ICMP echo requests. Still, I suspect there may be some
additional stuff happening with the RF network, ARP resolution does
not (IIRC) result in packet re-ordering.

One way to test would be to note the remote MAC, delete the ARP entry
and replace it with a permanent one set from the command line, then
try the ping test again. Repeat on the other end for going the other
direction. Then run the ping test and see if the first one remains
delayed.

rick jones
--
The glass is neither half-empty nor half-full. The glass has a leak.
The real question is "Can it be patched?"
these opinions are mine, all mine; HP might not want them anyway... :)
feel free to post, OR email to rick.jones2 in hp.com but NOT BOTH...
.

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