lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date:	Fri, 14 Nov 2008 23:37:06 -0500
From:	"Karl Pickett" <>
Subject: tcp_tw_recycle broken?

Hey.  Developing a http proxy on fedora 9 (2.6.25) and running into a
strange issue.

Having the proxy set up and tear down 6000 tcp connections a second to
the same test server ip and port,
it quickly blows up (5 seconds) due to all 30000 ephemeral ports going
setting tw_recycle=1 fixed the problem, and there are never more than
a couple hundred ports in TIME_WAIT.


Changing the load test to alternate between two test server ips, it
blows up.  Connect: can't assign requested address. (note I am not
binding before hand, I tried
and binding first to port 0 made no difference - it just blows up then
during the bind).

And there are ~28K ports in TIME_WAIT.  For example:

proxy_ip:30000 load_test_1:8080 TIME_WAIT
proxy_ip:30000 load_test_2:8080 TIME_WAIT
but most are not duplicates of the same local port.

What. The.  Heck.

So short of rebuilding the kernel with time_wait as 1 second, is there
any other way not to brick my proxy?

Karl Pickett

Karl Pickett
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to
More majordomo info at

Powered by blists - more mailing lists