I had that problem last weekend too (observed using Windows XP against Windows 2000 servrs), it was caused by WIN2K DFS not working properly, and telling local clients to go across the WAN to retrieve data from DFS (instead of from a local server). The long ack was due to 10 clients trying to install apps across a 512Kb frame link, and the RTT had gone up to quite a long time (can't remember excactly).
So in my limited experience, I would say you have congestion somewhere. Maybe time to do some traceroutes, and see where the problem lies. Hmm, also found this: Ack Too Long The time that it has taken to acknowledge data exceeds the Long Ack Time threshold plus three times the average acknowledgement time for this connection. Refer to the detail statistics screen for the value of this average acknowledgement time. Possible causes: 1 The recipient of the original data frame was temporarily busy, and could not process the frame as quickly as usual. 2 The ACK arrived late because a server had to look up and/or process data before responding with an ACK. 3 The path changed in a way that increased the time between the request and its acknowledgement. 4 There were multiple paths between the two stations, and the time to acknowledgement was longer for some paths than for others. Symon -----Original Message----- From: DeVoe, Charles (PKI) [mailto:[EMAIL PROTECTED]] Sent: 12 February 2003 14:51 To: [EMAIL PROTECTED] Subject: long ack times [7:62867] I have several users who are trying to run an application and often have problems. In using a sniffer on the packets I have found that some of the packets are experiencing long ack times. How does one troubleshoot this sort of problem? ============================================= This email has been content filtered and subject to spam filtering. If you consider this email is unsolicited please forward the email to [EMAIL PROTECTED] and request that the sender's domain be blocked from sending any further emails. ============================================= Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=62873&t=62867 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
