Questions tagged [tcp-window-scaling]
TCP congestion control depends on window scaling
10 questions with no upvoted or accepted answers
3 votes
0 answers
1k views
TCP Window Scaling Not Working Between Windows 10 and Linux Server
We are having some issues with several clients running Windows 10 downloading files from our HTTP file delivery server. We can't reproduce the error on our end but notice that TCP window scaling is ...
- 201
2 votes
1 answer
213 views
Why can't I reliably send or recieve data over TCP after moving servers?
I am currently dealing with a networking problem on high latency (100-400ms) Internet links. I run a Minecraft network, and I recently moved it to a separate datacenter to get a server with a better ...
- 481
2 votes
0 answers
2k views
How to change tcp's window size?
I've tried changing the tcp's window size by modifying net.ipv4.tcp_wmem and net.ipv4.tcp_rmem values, however the changes which I make have no effect on actual window size which I can check using a ...
- 41
1 vote
0 answers
441 views
Troubleshooting low TCP transfer rate behind a router
I’m trying to debug a low tcp transfer rate on a host (“lowHost”). As a reference, i’m comparing it against a second host (“highHost”). I’m making two rate measurements: Downloading a big file using ...
- 13
1 vote
0 answers
2k views
View / tweak TCP window size settings on Ubuntu 1804
I have a typical long fat network -- clients connect to servers with large bandwidth but also significant latency due to geographic distances of 30ms to 100ms, transferring large files. I've noticed ...
- 121
1 vote
0 answers
3k views
windows server 2012 tcp window not scaling
I've got 2 windows 2012 servers that limit connection speed to anywhere from 1-3mBps and it seems to be related to tcp window scaling. Both servers have these settings TCP Global Parameters --------...
- 21
1 vote
1 answer
575 views
IIS on Server 2012 R2 serving very slowly to remote clients
We've been trying to debug very slow transfer rates for remote clients hitting our web server (IIS on 2k12 R2). The RTT to the client is about 150ms, and we're struggling to get more than about ...
- 267
0 votes
1 answer
644 views
TCP CWND and RWND Mismatch
currently I am doing some Measurements (using iperf3, TCP-Tracepoints (for monitoring the Congestion-Window (CWND)) and tcpdump). While altering the TCP-Window (RWND) Field (using a nf-hook kernel ...
0 votes
0 answers
272 views
Bytes-in-flight higher than receiver window in frozen client connections
I am dealing with sort of a "ghost issue". We have an endpoint URL that some people can use at all times with no issues but others have a frozen connection on the client side (checked with ...
- 1
-2 votes
1 answer
965 views
How to determine the bottleneck of a given network
Consider an Access Point with a packet queue that can hold up to 50 packets and a network whose bottleneck is a link with a datarate of 50 Mbit/s. There are quite a few nodes connecting wirelessly ...
- 101