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Re: Whatever happend to compression?

To: Bill Sommerfeld <sommerfeld@apollo.hp.com>
Subject: Re: Whatever happend to compression?
From: wobber@pa.dec.com
Date: Thu, 23 May 96 11:25:22 -0700
Cc: karn@qualcomm.com, rodney@sabletech.com, ipsec@TIS.COM
In-Reply-To: Message of Thu, 23 May 1996 12:17:49 -0400 from Bill Sommerfeld <sommerfeld@apollo.hp.com> <199605231617.AA174718270@relay.hp.com>
MMDF-Warning: Parse error in original version of preceding line at neptune.TIS.COM
Sender: ipsec-approval@neptune.tis.com


>>    If the primary use of tunnel mode is for "road warriors" stringing up
>>    a tunnel to the home office, the "last hop" from the other tunnel
>>    endpoint to the application server will probably be over a LAN, which
>>    has effectively infinite bandwidth compared with 28.8k or even ISDN..

Agreed.  Furthermore, the use of tunneled-mode encryption eliminates 
any benefit from network or link level compression (e.g. modem-based) 
since encrypted bytes aren't readily compressible.  It takes payload 
compression prior to encryption to draw back even with non-encrypted 
performance over slow lines. 

Ted Wobber
DEC Systems Research Center

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