[10310] in cryptography@c2.net mail archive
Re: [linux-elitists] Re: Looking back ten years: Another
daemon@ATHENA.MIT.EDU (Matt Crawford)
Mon Jan 28 17:46:31 2002
Date: Mon, 28 Jan 2002 16:30:22 -0600
From: Matt Crawford <crawdad@fnal.gov>
In-reply-to: "28 Jan 2002 12:41:32 EST." <sjmvgdm5q5v.fsf@kikki.mit.edu>
To: Derek Atkins <derek@ihtfp.com>
Cc: cryptography@wasabisystems.com
Message-id: <200201282230.g0SMUMZ10775@gungnir.fnal.gov>
> There are other problems with using IPsec for VoIP.. In many cases
> you are sending a large number of rather small packets of data. In
> this case, the extra overhead of ESP can potentially double the size
> of your data.
HOW small? You'd already be adding IP+UDP+RTP headers (20 [or 40] +
8 + 12 = 40 [or 60] bytes). Using ESP with authentication would add
another 22, plus possible explicit IV and padding, if needed -- call
it 30?
20ms of uncompressed telephone quality data is 160 bytes ...
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