multicast arp/route issue


 
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Operating Systems Solaris multicast arp/route issue
# 1  
Old 01-05-2011
multicast arp/route issue

Hi forum members,

I've run into a problem that I'm hoping you can sort out.
Whenever I run an arp -a or netstat -p the command hangs. It seems that the system is trying to reverse lookup a multicast address and this is what causes the issues.

The commands are actually generated via monitoring software so I am unable to simply stop performing reverse DNS lookups via the appropriate command switches.

I am able to replicate the issue if I add the same multicast route on another server, but the route disappears on the other servers after a few seconds so does not cause any hang.

Below is the problem entry.

Code:
Device   IP Address               Mask      Flags      Phys Addr

------ -------------------- --------------- -------- ---------------

ce1    224.3.2.11           255.255.255.255          00:1d:a2:0e:57:00


Any help would be greatly appreciated.

Last edited by DukeNuke2; 01-05-2011 at 07:02 AM..
# 2  
Old 01-05-2011
How about adding:
options timeout:2

In the /etc/resolv.conf.

Or you could run "arp -an" and go through the IP addresses checking which ones resolve, and then add the ones that dont to /etc/hosts - that is if your network is relatively stable without lots of new hosts all the time.
# 3  
Old 01-06-2011
Thanks citaylor, the timeout option was what I was looking at if no other solution presented, as I do not have the timeout setting configured on the other servers where this issue is not occurring.

I'm unable to add the entry to hosts as it is a multicast address and so does not constantly resolve to a single host entry.
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