netdev - Re: PROBLEM: Linux kernel 2.6.31 IPv4 TCP fails to open huge amount of outgoing connections (unable to bind ... )

lists.openwall.net		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 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 21 Apr 2010 04:57:42 +0500
From:	Gaspar Chilingarov <gasparch@...il.com>
To:	Ben Greear <greearb@...delatech.com>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: PROBLEM: Linux kernel 2.6.31 IPv4 TCP fails to open huge amount 
	of outgoing connections (unable to bind ... )

Ohhh, see my bug report again, please :)

The problem arises when used port count is close to or more than the
number of local ports available on the system (in your case 40000
client connections is smaller than 51000 of available ports).

I think that if you choose to go with default settings and try to bind
half of your ports to one local IP and half of your ports - to another
one -- you will hit this bug as well.

If you explicitly bind to the local ports as well - it _may_ solve a
problem - I will this today (it's just a workaround, but in fact not
the solution :), but if you let kernel automatically find local ports
- you will get the errors.

/Gaspar


2010/4/21 Ben Greear <greearb@...delatech.com>:
> On 04/20/2010 04:35 PM, Gaspar Chilingarov wrote:
>>
>> sysctl -a | grep local_port_range
>
> [root@...03-10G-09 ~]# sysctl -a | grep local_port_range
> net.ipv4.ip_local_port_range = 10000    61000
>
> I'm explicitly binding to local ports as well as local IPs, btw.
>
> Thanks,
> Ben
>
> --
> Ben Greear <greearb@...delatech.com>
> Candela Technologies Inc  http://www.candelatech.com
>



-- 
Gaspar Chilingarov
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html