From: Steffen Klassert <steffen.klassert@secunet.com>
To: Gabriele Beltrame <belgab@drvsource.net>
Cc: <netdev@vger.kernel.org>
Subject: Re: Random packet loss using IPsec with AES128-SHA1
Date: Wed, 16 Dec 2015 10:59:54 +0100 [thread overview]
Message-ID: <20151216095954.GN29565@gauss.secunet.com> (raw)
In-Reply-To: <000a01d137e2$afedd130$0fc97390$@drvsource.net>
On Wed, Dec 16, 2015 at 10:17:54AM +0100, Gabriele Beltrame wrote:
> Hi,
>
> I'm running a few Strongswan 5.3.* CentOS (Kernel 3.16.7, 4.2.6, 4.1.*)
> instances on AWS to terminate VPNs between each other and/or to other
> devices across the Internet.
> While investigating some application issues, I've noticed that on every VPNs
> I have random packet losses (from 1% to 4% over 100 to 300 requests sent).
> This only happens when the two following conditions are met: (a) AES
> encryption used, (b) IP packet size shorter than about (150+8+20)Bytes.
I've never seen this.
If xfrm statistics are compiled in, a counter is bumped for each packet
dropped by IPsec. You can check these counters in /proc/net/xfrm_stat.
This will tell you at least whether IPsec is the reason for your packet
loss.
next prev parent reply other threads:[~2015-12-16 9:59 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-16 9:17 Random packet loss using IPsec with AES128-SHA1 Gabriele Beltrame
2015-12-16 9:59 ` Steffen Klassert [this message]
2015-12-17 15:36 ` Gabriele Beltrame
2015-12-18 7:41 ` Steffen Klassert
-- strict thread matches above, loose matches on Subject: below --
2015-12-06 10:05 Gabriele Beltrame
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