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Forum Discussion

Dazzla_20011's avatar
Dazzla_20011
Icon for Nimbostratus rankNimbostratus
Apr 12, 2011

Difference between tcp and tcp half open monitor

Hi,     What's the difference between the a tcp and tcp half open montor?     I thought the Tcp monitor just checked the tcp three way hadshake and tcp half open just checked SYN-ACk is ...
config
design
Minn_62043's avatar
Minn_62043
Icon for Cirrostratus rankCirrostratus
Apr 14, 2011
You can use "tcpdump" on the BIG-IP system to check the connection status. For quick check 

tcpdump -ni [internal_vlan] host [pool_member_ip] and tcp

That is if you are checking a pool member 10.0.0.10 on vlan named "internal": 

tcpdump -ni internal host 10.0.0.10 and tcp

If you do not have normal traffic from virtual, you'll only see probes going to that node.