How to connect Linux(server) and Windows(client) using only IPsec

[hotsouce]

I have to make a security tunnel between Linux(server) and Windows(client).

Tunnel will be using to remote administration Linux server.

Is any Windows Client IPsec for Windows ?
I don't want use pptp(unsecure) and l2tp(SLES 10 SP2 hasn't l2tp demon support)

Have you any solution ?

PS
Sorry for my english ;-)

[topdog]

windows does have a command line ipsec client.