[linux-elitists] Re: Looking back ten years: Another Cypherpunksfailure (fwd)

Matt Crawford crawdad at fnal.gov
Mon Jan 28 17:30:22 EST 2002


> 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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