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Forum Discussion

Gea-Suan_Lin_34's avatar
Gea-Suan_Lin_34
Icon for Nimbostratus rankNimbostratus
Jan 05, 2010

Packet lost when loading

Hello,     We have two F5 BIG-IP LTM 6400 with 9.4.7 HF2, running with Active/Standby mode. I setup snmp trap, and copy these log to IRC, to let our management team understand what's happen...
config
design
smp_86112's avatar
smp_86112
Icon for Cirrostratus rankCirrostratus
Jan 09, 2010
So the SYN-ACK sent from the web server to the LTM was never received - definitely indicates packet loss. This sounds very much like a duplex mismatch somewhere between the two endpoints . I would start comparing the speed and duplex settings everywhere along the device chain. In particular if you have 100Mbit links somewhere, ensure one side isn't set to 100/Full while the other is set to Auto/Auto. This results in a half-duplex link which causes collisions and packet loss - I've seen it many times.