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pjcampbell_7243's avatar
pjcampbell_7243
Icon for Cirrus rankCirrus
May 10, 2010

Weird timeouts - any insight

We have a new subnet call it 10.1.18.0 - and only one pool of ours has one pool member on this new subnet.     When I enabled the new pool member, we get very long response times (15-30) sec...
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hoolio's avatar
hoolio
Icon for Cirrostratus rankCirrostratus
May 11, 2010
Hi PJ,

 

 

I can't think of a reason that this would be happening. Maybe incompatible source port reuse? Are you using SNAT for the communication from LTM to the pool members?

 

 

Anyhow, I'd suggest capturing tcpdumps on LTM of a failure. You'll want to get the client and serverside communication. You can use a tcpdump command like this to get both sides of traffic:

 

 

tcpdump -ni 0.0 -s0 -w/var/tmp/trace.1.dmp host VIP_IP or host NODE_1_IP or host NODE_2_IP or host NODE_3_IP

 

 

As this captures all traffic to the virtual server and pool member IP addresses, it could get big quickly. So try to stop the trace as soon as a failure occurs. You can use WinSCP to copy the trace off the unit and Wireshark to analyze it. If you need any help with the capture and analysis you can open a case with F5 Support.

 

 

Aaron