TCP congestion control depends on window scaling

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35 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: ...
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3answers
382 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 ...
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6answers
2k 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 ...
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2answers
734 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 ...
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3answers
642 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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2answers
596 views

FreeBSD slow transfers - RFC 1323 scaling issue?

I think I may be having an issue with window scaling (RFC 1323) and am hoping that someone can enlighten me on what's going on. Server: FreeBSD 9, apache22, serving a static 100MB zip file. ...
4
votes
1answer
809 views

Cisco ASA 5505, tcp window scaling (rfc1323)

I have a very odd issue with our cisco firewall, If on our osx machines we run the following to disable window scaling support: sudo sysctl -w net.inet.tcp.rfc1323=0 We see near 40% ...