I have just done a packet capture on my Cisco 3750G VLAN that hosts all our servers. I am noticing a load of [TCP Dup ACK], [TCP Out-of-Order], [TCP Fast Retransmissions] packets on that segment. Is this something that is expected on a switch that is sending traffic between two devices in the same VLAN on the Same Switch ?
The most concerning thing is the [TCP Out-of-order] packets, this is because i tried to plug in a Pix535 Firewall and it appeared to cause issues with internet traffic, then i read somewhere that the FragGuard (which cannot be turned off in Version 7) will not accept fragmentation packets out of order. I really need to resolve this issue so if anyone has any explinations to whats going on or any help/advise in diagnosing this ?