Hi, On Wed, 2007-09-19 at 01:25 -0700, Steven Dake wrote: > 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 The normal settings for multicast ttl are: 0 - node local 1 - link local <32 - site local (so I guess a setting of 31 is reasonable here) >128 - global I also found a ref with the following extra values which I didn't remember: 33-64 region local 65-128 continent local I'm not sure if those last couple are official or not, 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 -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
