Do you have any specifics for the Linux patch? I'd love to research a bit more into exactly how Linux resolved this... I apologize for my long silence. I found the following bypass method of the problem in the WEB: > --- src/racoon/ipsec_doi.c.orig Thu Feb 2 23:37:17 2006 > +++ src/racoon/ipsec_doi...

I have asked MT to provide a fix for this on their side

As I know, there is a patch for Linux-based systems that fixes the problem. It would be nice if the developers will implement something similar in RouterOS.

Thanks for your answer, grg . Yes, you are right. The RouterOS v5rc11 also is unable to establish ipsec between itself and my NATed Windows Mobile client properly. A Mikrotik system log registers following errors that lead to disconnecting of ipsec: 13:37:35 ipsec,debug Expecting IP address type in ...

Hello! Has anyone a positive experience for L2TP/IPSec between native Windows Mobile VPN client and MikroTik VPN server? My RB450G@RouterOS 4.17 located behind another router – D-Link DFL 210 that establishes connection to ISP by L2TP, provides NAT. But port forwarding is provided for all necessary ...