Re: First ping response receiving late

On Wed, 12 Sep 2007, in the Usenet newsgroup comp.os.linux.networking, in
article <1189605171.756260.59840@xxxxxxxxxxxxxxxxxxxxxxxxxxx>,
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).

What operating system?
What type of RF network?
What version of ping?
What is the EXACT command used?
What is the exact output for the first three packets?
What does a packet sniffer show?
What does '/sbin/arp -a' show before and during the ping?

Any idea,

Not enough information. Could be a lot of different things. Is the
RF link up/active when the first ping attempt occurs, or does the link
have to wake up? Does using 'ping -n IP.of.Gate.way' make any
difference?

Is it because it is ICMP message, not a high priority messge, that is
why it might receive late.

Depends on the network stack configuration and/or traffic conditioning.
Use a packet sniffer, and compare the ping attempts with attempting to
connect to ANY open or closed port on the gateway using a TCP based
service like telnet (example - 'telnet IP.of.Gate.way 70' which would
attempt to establish a connection to port 70 [gopher] which should be
closed - does the system come back immediately with a 'Connection
refused' error message).

Old guy

.

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