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Old 07-13-2009, 04:53 AM   #1
shreeman
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Registered: Jul 2009
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Flushing Linux kernel routing table - server got shutdown


i have a requirement in which i have to flush kernel routing table (main table) and then populate it with net and host address from /etc/sysconfig/static-routes files on Linux RHEL5.2 release (64bit)servers. i tried running this command "ip route flush table main proto boot" at command prompt but server got shutdown immediatley after running this command. Also i tried a script to delete each entry from kernel routing table. After the execution of script server got shutdown.
Script:-

echo "Flushing routing table"
ip route show table main | while read ROUTES; do
ip route del $ROUTES
done
echo "Done Flushing !!"
echo "Show routing table content"
`ip route show table main`
echo "Done Showing content !!"

output:-
Flushing routing table
Done Flushing !!
Show routing table content
Done Showing content !!

please suggest how to flush the Linux kernel routing table.
 
Old 07-13-2009, 05:51 AM   #2
jschiwal
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Registered: Aug 2001
Location: Fargo, ND
Distribution: SuSE AMD64
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You might want to read the code in ifdown-route & ifup-route. Wouldn't it be a lot easier to shut down the interface (ifdown <interface>). That will flush the routes. Your problem may be due to shutting down the local host route.

From browsing the script, running "ifroute-up" sets an ACTION variable to "replace". This sounds like you can run ifroute-up to flush and replace the routes.

I'm using SuSE, but there may be a similar script in rhel. Try grepping files in /etc/ for the string "ip route" or better yet "static-routes". The script you find may do exactly what you want.

This webpage has examples of using "ip route flush".
http://www.physics.umd.edu/pnce/pcs-...oute-hack.html

Last edited by jschiwal; 07-13-2009 at 05:53 AM.
 
  


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