From: Brian Dennis (brian@labforge.com)
Date: Fri Mar 14 2003 - 21:42:27 GMT-3
Basically it is up to the developer of the ping program to specify a
maximum timeout for a reply. Some developers use an unsigned integer for
the timeout value which would allow for a theoretical maximum of
4,294,967,295 milliseconds.
A Cisco router will allow up to 10 minutes for a reply.
Rack4R1#ping
Protocol [ip]:
Target IP address: 1.1.1.1
Repeat count [5]:
Datagram size [100]:
Timeout in seconds [2]: ?
% A decimal number between 0 and 3600.
Windows XP will allow over 24 days for a reply.
C:\>ping -w 2147483649 1.1.1.1
I've actually seen a circuit that was thought to be down but was just
extremely slow. It would take over 3 minutes for a ping reply.
Brian Dennis, CCIE #2210 (R&S/ISP Dial/Security) CCSI# 98640
brian@labforge.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Jerry
Sent: Friday, March 14, 2003 3:19 PM
To: ccielab
Subject: PING slightly OT
Hello group,
I had a "genius" who dabbles in his own network code
say that his Ping response time from client to his server, which is only
3 routers away, was over 80 seconds. At first I thought he meant
milliseconds but it actually turned out to be 1 minute and 20 seconds.
Question #1.) Does anyone know the timeout maximum from the ICMP spec?
I tried looking up in the RFC but was unable to find it.
Any extraneous comments welcome.
Jerry
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