TCP resets with WAAS 7341?

[jkeeffe]

We're running v4.4.1 on both remote and data center WAE 7341s and we're seeing TCP resets during some of our HTTP connections.

I'm just now beginning to look into the problem and noticed this the reset counters in 'show statistics tcp' such as:

IKA-7341-K9#sh statistics tcp

TCP statistics

--------------

Server connection openings                         = 2323

Client connection openings                         = 1850

Failed connection attempts                         = 111

Connections established                            = 68

Connections resets received                        = 57

Connection resets sent                             = 119

Segments received                                  = 365727

Segments sent                                      = 362292

Bad segments received                              = 0

Segments retransmitted                             = 642

I just rebooted the device an hour before doing the show command, and at this time there are only 12 connections being optimized.

Are these reset statistics of concern?

[Bhavin Yadav · Accepted solution]

Hi Jeff,

TCP RST Packets is a counter of all TCP RST Packets over a period of time. This variable counts the number of RST responses to monitor resets in TCP/IP.

RST packets are a sign that the TCP connections are half open. One station or the other stopped sending information or ACKs for some reason. There are acceptable times for RST packets, however, if there are a large number of RST packets in a conversation, this is definitely something to troubleshoot.

This is not a WAAS problem but WAAS is showing up something that is going on in the network. These are some statistics that WAAS collects over the period from the network traffic.

Hope this helps.

Regards,

PS: Please mark this as Answered, if this answers your question.

[jdw-cisco]

A. TCP RST is also a normal response from a host when the requested port is not open. For example, if you try to Telnet to a device that is not a Telnet server, a TCP RST is sent instead of a ACK/SYN.