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RE: IPCOMP and IPSEC
Saroop,
Well IPSEC does change the whole picture for compression. With
encryption being performed at the IP layer, compression needs to happen
there too (not at the datalink). The IP-layer compression (IPPCP) calls
for zero-history compression - for which the performance can be bad.
When we did LZS zero-history support for X.25 links, we used a minimum
packet size of 500bytes, i.e. we would not even try to compress the
packet if it was smaller than that.
On my office link (ISDN/PPP/LZS with history), I average 2:1
compression. I suspect this would reduce noticeably for zero-history.
Steve.
-----Original Message-----
From: Saroop Mathur [SMTP:saroop@cylan.com]
Sent: Friday, May 29, 1998 1:02 AM
To: Eric Dean; Daniel Harkins
Cc: Stephen Waters; ippcp@external.cisco.com; ipsec@tis.com
Subject: Re: IPCOMP and IPSEC
Eric,
The compression ration depends a lot on the type of data and the packet
size. Using IPSEC will not change the compression ratio since
compression
is done before IPSEC.
- Saroop
----------
> From: Eric Dean <edean@gip.net>
> To: Daniel Harkins <dharkins@cisco.com>
> Cc: Stephen Waters <Stephen.Waters@digital.com>;
ippcp@external.cisco.com; ipsec@tis.com
> Subject: Re: IPCOMP and IPSEC
> Date: Thursday, May 28, 1998 3:39 PM
>
> > Anybody out there want to test IPSec and IPCOMP together? Send me an
> > email.
> >
>
> Sure, we tried IPCOMP without IPSec and got about 1.05:1 compression
ratio
> though. I can't wait for after IPSec.
>
> _______________________________________________________________
> Eric Casey Dean
> Supervisor: IP Product Engineering
> Tel#: 703-689-5298 Fax#: 703-478-7852 Mobile#: 703-598-0962
>
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