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 ?
Thanks very much for your reply. We are not using "Teamed" NICs however one of the servers is WNLB and one of the WNLB is off-line. We also have two of the fibre ports plugged into two Nortel Passport switches using the PortChannel command on them ports. I have not really been looking at this side of the switch because the issues are just with two servers on the Gig Copper Ports.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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