My apologies I must have missed that email. The code in openais is untested in a routed environment because I dont have any routed environments to test with. This is why TTL is not configurable in the current openais or tested with any values greater then 1. I can build you an RPM with ttl set to some greater value to test with if you like. Regards -steve On Wed, 2007-09-19 at 18:15 +1000, Nikolas Lam wrote: > Some weeks ago I posted to this list reporting problems with my 2-node > RHEL5 cluster where I had each node on a different VLAN, connected by a > layer 3 router. > > The problem was that the OpenAIS (cluster communications) packets were > not reaching the other node, so all sorts of annoying things were > happening. > > Well, I've just had someone with extensive multicast experience help me > with some troubleshooting. We've discovered that the problem appears to > be that the packets are going out with a TTL of 1, which means the first > router to receive it will drop it without forwarding. > > Here's a piece of tcpdump -v > > 04:47:23.167506 IP (tos 0x0, ttl 1, id 0, offset 0, flags [DF], proto > UDP (17), length 102) 172.16.99.50.5149 > 239.224.72.11.5405: UDP, > length 74 > 04:47:23.336194 IP (tos 0x0, ttl 1, id 0, offset 0, flags [DF], proto > UDP (17), length 102) 172.16.99.50.5149 > 239.224.72.11.5405: UDP, > length 74 > 04:47:23.538871 IP (tos 0x0, ttl 1, id 0, offset 0, flags [DF], proto > UDP (17), length 146) 172.16.99.50.5149 > 239.224.72.11.5405: UDP, > length 118 > 04:47:23.658161 IP (tos 0x0, ttl 1, id 0, offset 0, flags [DF], proto > UDP (17), length 102) 172.16.99.50.5149 > 239.224.72.11.5405: UDP, > length 74 > 04:47:23.826268 IP (tos 0x0, ttl 1, id 0, offset 0, flags [DF], proto > UDP (17), length 102) 172.16.99.50.5149 > 239.224.72.11.5405: UDP, > length 74 > 04:47:24.026863 IP (tos 0x0, ttl 1, id 0, offset 0, flags [DF], proto > UDP (17), length 146) 172.16.99.50.5149 > 239.224.72.11.5405: UDP, > length 118 > > > So, I guess the question is, what is the correct method to set the TTL > to be a bit more reasonable, say 128? > > Regards, > > Nik Lam > > -- > Linux-cluster mailing list > Linux-cluster@xxxxxxxxxx > https://www.redhat.com/mailman/listinfo/linux-cluster -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
