Solved

FTP data is identified as window update in Wireshark

Posted on 2011-09-14
4
715 Views
Last Modified: 2012-06-21
In the expert info composite screen the ftp data packets show up as windows update?

Group        Protocol     Summary                Count
Sequence  TCP            Window Update     37856

Is this normal? Does the wireshark dissector not identify FTP data correctly?

Or do I have a lot of windows update traffic on the network?
0
Comment
Question by:Dragon0x40
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
4 Comments
 
LVL 6

Accepted Solution

by:
netjgrnaut earned 500 total points
ID: 36539309
A TCP Window Update packet should not be confused with a "Microsoft Windows Update" packet (which Wireshark wouldn't identify as such, anyway).

Explanation from http://ask.wireshark.org/questions/901/expertmessage-window-update...

A packet marked "TCP Window Update" simply indicates that the sender's TCP receive buffer space has increased. Look at the previous packet from the sender - note the Window Size value in the TCP header. Then look at the "TCP Window Update" packet's Window Size setting.

What triggers these "TCP Window Update" packets? When an application picks up data from the receive buffer there is now more receive buffer space available. Wireshark sees the Window Size field value has increased and marks it to let you know the Window Size field has increased.

This is normal network behavior. Problem behaviors would be Zero Window conditions.

Hope that helps!
0
 

Author Comment

by:Dragon0x40
ID: 36539392
In the experts infos:

I have no errors

I have these warnings:

Window is full   20

Zero Window   17

ACKed lost segment (common at capture start)  63

Previous segment los (common st caputre start)  78

Out-Of-Order segment   187

Fast retransmission (suspected)  14

This was on a 1gb ftp file transfer
0
 
LVL 6

Expert Comment

by:netjgrnaut
ID: 36539494
Is this a new question?

Wireshark is not mis-identifying your FTP traffic.
The Window Update packet has nothing to do with MS Windows Update.

So... what's the question?
0
 

Author Comment

by:Dragon0x40
ID: 36539527
I will open a new question.
0

Featured Post

NEW Veeam Agent for Microsoft Windows

Backup and recover physical and cloud-based servers and workstations, as well as endpoint devices that belong to remote users. Avoid downtime and data loss quickly and easily for Windows-based physical or public cloud-based workloads!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

We've been using the Cisco/Linksys RV042 for years as: - an internet Gateway - a site-to-site VPN device - a leased line site-to-site subnet-to-subnet interface (And, here I'm assuming that any RV0xx behaves the same way as an RV042.  So that's …
The Cisco RV042 router is a popular small network interfacing device that is often used as an internet gateway. Network administrators need to get at the management interface to make settings, change passwords, etc. This access is generally done usi…
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
This video gives you a great overview about bandwidth monitoring with SNMP and WMI with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're looking for how to monitor bandwidth using netflow or packet s…

751 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question