netdev - Re: Beyond 64K TCP connections limit per IP-address

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] [day] [month] [year] [list]

Date:	Thu, 5 Jul 2007 12:28:43 +0300
From:	"Robert Iakobashvili" <coroberti@...il.com>
To:	NetDev <netdev@...r.kernel.org>
Subject: Re: Beyond 64K TCP connections limit per IP-address

On 7/4/07, Eric Dumazet <dada1@...mosbay.com> wrote:
> On Wed, 4 Jul 2007 11:40:48 +0200
> "Robert Iakobashvili" <coroberti@...il.com> wrote:
>
> > On 7/4/07, Evgeniy Polyakov <johnpol@....mipt.ru> wrote:
> > > On Wed, Jul 04, 2007 at 09:50:31AM +0200, Robert Iakobashvili (coroberti@...il.com) wrote:
> > > > If I am correct, a TCP server can make up to
> > > > 64K accepts for a port at a single IP-address.
> > >
> > > No, it is essentially unlimited - linux uses local/remote addr/port
> > > tuples for hash chains, so there is no per-addr limits.
> > > If there is some kind of binds, then yes, only 64k ports per address.
> >
> > Thanks, it clarified me the issue.
> > Probably, I am experiencing some local problem with
> > the web-server I am using for tests.
>
> If your setup is :
> Server A with one IP address listening to port 80
> 'Client B' with one IP address, trying to open many sockets to A (port 80)
> Then yes you have a 64k limit for this particular client B. Just add 15 more clients (or 16 IP addresses on B) if you really want to stress A ;)

Actually, each client has its own secondary IP, and
the problem was in nginx server configuration (errare humanum est).
Thank you, Eric.

-- 
Sincerely,
Robert Iakobashvili,
coroberti %x40 gmail %x2e com
...........................................................
http://curl-loader.sourceforge.net
A web testing and traffic generation tool.
-
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