windows server 2003 required for L2TP VPN?

[djc]

I'm trying to get my clients using L2TP/IPSec for VPN instead of PPTP. I'm
using ISA Server 2000 on Windows 2000 Server SP4, can this work? or is
Windows Server 2003 actually required?

any input is appreciated. Thanks.

 

[Steven L Umbach]

L2tp will work on Windows 2000 as long as there is not any NAT devices being
used either by the client or in front of the Windows 2000 VPN server. If NAT
is used then you will have to use Windows 2003 and the NAT-T client update
on Windows 2000/XP Pro computers to access the Windows 2003 VPN server. The
NAT-T update does not allow Windows 2000 VPN server to work behind a NAT
device - it is only a VPN client update. Windows 2000 also requires computer
certificates on VPN server and VPN client. Pptp is still reasonably secure
as long as mschapv2 is used and the users use strong passwords however pptp
does not use computer authentication. --- Steve