[Openswan Users] ipcomp

Jacco de Leeuw jacco2 at dds.nl
Tue Mar 22 23:08:51 CET 2005

Dino Dragovic wrote:

> I need to setup ipsec/l2tp(openswan 2.3.0, 26sec, kernel 2.6.8),and it
> works just fine,but my clients (win xp) also need ip compression. I've
> modified the registry according to Jacco's manual,but when I establish vpn
> connection,in the properties of the connection there is no compression.( i
> am not using ppp compression )

Unfortunately the native IPsec implementation included with Windows 2000/XP
does not support IPsec compression (IPCOMP). That registry hack was meant
for another client, the MSL2TP client for Windows 9x/Me/NT, so it does
not work on Windows 2000/XP.


Perhaps PPP compression is your best bet after all, if you don't want to
change things too much. Unfortunately, the MPPC compression supported by
Windows 2000/XP is patent encumbered. Be glad you're not in the EU (yet)
so you don't have those stupid software patent laws! :-)

Jacco de Leeuw                         mailto:jacco2 at dds.nl
Zaandam, The Netherlands           http://www.jacco2.dds.nl

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