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Shell Programming and Scripting
Testing connection with a script
Post 302351260 by matrixmadhan on Tuesday 8th of September 2009 12:24:14 AM
09-08-2009
Welcome to the forum !
This is just a hint and am not very thorough with this.
Ping works using ICMP and a host might be still up and not accepting/responding to ICMP packets, in such cases ping might not help with. Instead, check if the destination ip is reachable. If that is so, start the process from the local host where request is initiated.
Let us know, how it goes
This is just a hint and am not very thorough with this.
Ping works using ICMP and a host might be still up and not accepting/responding to ICMP packets, in such cases ping might not help with. Instead, check if the destination ip is reachable. If that is so, start the process from the local host where request is initiated.
Let us know, how it goes
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LEARN ABOUT REDHAT
clockdiff
CLOCKDIFF(8) System Manager's Manual: iputils CLOCKDIFF(8) NAME
clockdiff - measure clock difference between hosts SYNOPSIS
clockdiff [ -o] [ -o1] destination DESCRIPTION
clockdiff Measures clock difference between us and destination with 1 msec resolution using ICMP TIMESTAMP [2] packets or, optionally, IP TIMESTAMP option [3] option added to ICMP ECHO. [1] OPTIONS
-o Use IP TIMESTAMP with ICMP ECHO instead of ICMP TIMESTAMP messages. It is useful with some destinations, which do not support ICMP TIMESTAMP (f.e. Solaris <2.4). -o1 Slightly different form of -o, namely it uses three-term IP TIMESTAMP with prespecified hop addresses instead of four term one. What flavor works better depends on target host. Particularly, -o is better for Linux. WARNINGS
o Some nodes (Cisco) use non-standard timestamps, which is allowed by RFC, but makes timestamps mostly useless. o Some nodes generate messed timestamps (Solaris>2.4), when run xntpd. Seems, its IP stack uses a corrupted clock source, which is synchro- nized to time-of-day clock periodically and jumps randomly making timestamps mostly useless. Good news is that you can use NTP in this case, which is even better. o clockdiff shows difference in time modulo 24 days. SEE ALSO
ping(8), arping(8), tracepath(8). REFERENCES
[1] ICMP ECHO, RFC0792, page 14. [2] ICMP TIMESTAMP, RFC0792, page 16. [3] IP TIMESTAMP option, RFC0791, 3.1, page 16. AUTHOR
clockdiff was compiled by Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>. It was based on code borrowed from BSD timed daemon. SECURITY
clockdiff requires CAP_NET_RAWIO capability to be executed. It is safe to be used as set-uid root. AVAILABILITY
clockdiff is part of iputils package and the latest versions are available in source form for anonymous ftp ftp://ftp.inr.ac.ru/ip-rout- ing/iputils-current.tar.gz. iputils-020927 27 September 2002 CLOCKDIFF(8)