Questions tagged [tcp-window-scaling]

TCP congestion control depends on window scaling

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1answer
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How to adjust TCP Window Size?

I asked a similar question before, but I believe I was not clear with the details. I'm basically having some problems with my server related to high latency between the server and the clients due to ...
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0answers
152 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 ...
3
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1answer
153 views

On a TCP connection, can the recipient control the TCP window size that the sender uses?

The TCP window size is the amount of data that the sender will send before waiting for a TCP ack. Does the receiver have a way to control this (e.g., as part of the TCP handshake), or is it only the ...
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0answers
124 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 ...
2
votes
1answer
66 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 ...
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0answers
1k 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 ...
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0answers
2k 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 --------...
-2
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1answer
119 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 ...
1
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1answer
188 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 ...
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0answers
1k 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 ...
3
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3answers
9k views

better alternative for tcp_syncookies in linux

In an effort to prevent DDOS attacks I followed suggestions to leave /proc/sys/net/ipv4/tcp_syncookies value set to 1 in my linux box to enable TCP syncookies. However, when I look at this URL: http:/...
34
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4answers
27k views

Receiver limits TCP window size to 64,512

Facts (please identify any false statements): I have a 100 Mbps connection between two sites that are 80 ms apart This is a long fat connection that could benefit from a large TCP window size perhaps ...
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6answers
8k views

Dropped packets, on recieve only, Server 2008 only, and network speed is 100mb/s

I have a really strange one. I have packet loss with Excessive 'TCP Dup ACK' & 'TCP Fast Retransmission' when I download files (and only download) from two different Windows 2008 servers. Upload ...
3
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2answers
4k views

How to edit TCP window size from iptables?

There is TCPMSS target to edit MSS value of connections (including forwarded). How to edit window size (for example, cap to some maximum value) by iptables rule? Expecting something like iptables -...
7
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3answers
2k views

TCP Window Scaling for Satellite Connections

A satellite connection generally has a RTT around 500ms. Connections generally suffer sub-optimal transfer speeds, in spite of large amounts of bandwidth because TCP acknowledgements take too long to ...

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