Want to win a PS4? Go Premium and enter to win our High-Tech Treats giveaway. Enter to Win

x
?
Solved

TCP DUP ACK and TCP Windows Update

Posted on 2010-08-30
1
Medium Priority
?
2,040 Views
Last Modified: 2012-05-10
I know there have been several questions asked on this topic and I have reviewed them.  

Here is my question.  i am doint a Wireshark capture over two 100/full connections that appear to be clean except for these two flags.  There are no re-transmits or fast re-transmits.  All of the DUP ACK and TCP Window Updates are gernated from my source server out to the server that sends me the data stream.  
Here is how my data flow works.  I connect out from my server to a remote server to start a data stream over a 100/FULL local connection.  Once the stream starts it is only a one way street.  My side is only consuiming the stream.  When I look at the wireshark logs filtered with tcp.analysis.flags it show tons of TCP DUP ACK errors from my side to the feed side.  I have changed my buffers on my NIC and various other items.  Is there anything that I am missing?  I have verified my switch logs and everything is clean there also.
0
Comment
Question by:ericluoma
[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
1 Comment
 
LVL 28

Accepted Solution

by:
mikebernhardt earned 2000 total points
ID: 33568308
Depending on your mirroring topology and where exactly you are capturing from, you could simply be seeing the same ACKs twice. For example if you were capturing on links both in and out of a switch. Usually this would mean seeing all packets twice but again, it's possible to see one side once and the other side twice. Think it through and make changes as required.
0

Featured Post

How to Use the Help Bell

Need to boost the visibility of your question for solutions? Use the Experts Exchange Help Bell to confirm priority levels and contact subject-matter experts for question attention.  Check out this how-to article for more information.

Question has a verified solution.

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

Quality of Service (QoS) options are nearly endless when it comes to networks today. This article is merely one example of how it can be handled in a hub-n-spoke design using a 3-tier configuration.
In this article, we’ll look at how to deploy ProxySQL.
If you're a developer or IT admin, you’re probably tasked with managing multiple websites, servers, applications, and levels of security on a daily basis. While this can be extremely time consuming, it can also be frustrating when systems aren't wor…
In this brief tutorial Pawel from AdRem Software explains how you can quickly find out which services are running on your network, or what are the IP addresses of servers responsible for each service. Software used is freeware NetCrunch Tools (https…

604 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