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Interesting issue while testing multicast. TTL value from linux box.
That is very nice to know, thanks Greg.
I wonder if this applies to other linux distros as well…
Or can be changed in the ip*.c & .h files and fixed with a recompile?
Anyone?
Thanks,
Joe
—–Original Message—– From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Greg Wendel Sent: Wednesday, July 23, 2008 12:59 AM To: Cisco certification Subject: Interesting issue while testing multicast. TTL value from linux box.
While testing a multicast setup I ran into an issue where my test linux box couldn’t work as a multicast source.
The problem ended up being the TTL on the multicast ping packets. Apparently the default behavior on my distro, Centos, is to set the TTL to 1 on multicast pings.
I added the -t flag and magically everything worked.
ping 233.1.1.1 -t 101
Hope this helps someone.
– Gregory Wendel, CCIE #20179(R&S) Springfield VA, 22153
