How to change maximum send size via TCP without receive?

[Tis Veugen]

Hi,

Suppose a TCP connection has been realized between a client and a server.
The client sends data via the TCP socket to the server, but the server does not read the data for whatever reasons. A small tests shows that the client can send about 440 KByte on my Ubuntu system, and then keeps waiting.
My question is what parameter determines this size of 440 KB? And how can I change it?

Best regards,
Tis

 

[ryanvade]

/etc/sysctl.conf

# increase TCP max buffer size settable using setsockopt()
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216

http://fasterdata.es.net/host-tuning/linux/#toc-anchor-2

 

[grim76]

I am not sure that adjusting those settings are your issue. I would do a tcpdump to capture traffic and see if something is not resetting your connection. Typically when something halts like that adjusting the buffers will only aggravate things.

EDIT:
I just thought of something. Do you have an IDS/IPS in the mix? That could be seeing your traffic as something it is not. We had something similar happen where I work with some application related traffic. We actually had to go in and "whitelist" the two servers in question so that the application would work.