We have a pair of CSM 4.1.6 in bridge mode and we have a VIP for passive ftp set. We are seeing consistent errors with FTP port 1985. We took several captures and notice that conns show ESTAB on CSM but the client sends the SYN receives the SYNACK then sends the ACK but the ack never gets to the server and this only happens on port 1985. I also looked at the capture on the server and see that the ACK never gets to the server. We try TCP ports 1984 and 1986 everything works perfectly. Has anyone seen anything like this before?
virtual 10.x.2.100 tcp ftp service ftp
no nat client
EdSw02#sh mod csm 4 conns vserver PSCO_FTP---21 det
Thx sadbulali, I see...but according to the tcp dumps on client and server you never see a FIN in either direction. What you do see is the client sending SYN the real gets the SYN it sends a SYN/ACK and the client then receives the SYN/ACK then the client proceeds to send the ACK which never reaches the real server...And it seems to be stopping at the CSM.
How does everyone feel about service graphs in a brownfield network centric cutover? maybe I'm an old school engineer but I was taught that if you have to do a Pbr then your design is wrong. they are a pain to troubleshoot because you always f...
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