AltostratusI have assigned the inband monitor to a virtual server pool and the pool will go down intermittently.
What does the inband monitor send to the server and what is it expecting back?
Hello.
You can capture the traffic of the HTTP monitor using tcpdump.
# tcpdump -vs0 -nnei 0.0 host <backend_server_ip> -c 10Or even better, using this (to check with hexadecimal info)
# tcpdump -Xs0 -nnei 0.0 host <backend_server_ip> -c 10KR,
Dario.
CirrostratusThe inband monitor is a completely different kind of monitor from the other monitors offered by BIG-IP in that it doesn't send any content to a pool member itself (it's not whats termed an 'active monitor').
Instead, it looks at the success of connection setup for load balanced traffic - if a SYN is sent to a server and the server doesn't respond to with a SYN/ACK, that's an error and if the number of errors in a rolling time interval breaks a threshold, the server is marked down. The inband monitor will release the pool member from it's down status after a period of time (300 seconds by default), and begin tabulating errors again.
AltostratusI have a pool that contains a single server and when I assign the inband monitor to the pool it will take the server down for short periods. However when I create an https monitor the pool member will stay up and not report any errors. I thought that if the inband monitor failed all other monitors would not function properly. Would it be possible to explain why this might be? Thanks