change L2tp port - is it possible?

RouterOS General
1

Hi,

We use Mikrotik as router, gateway and firewall for internal subnet.
Inside we use Small Business Server 2008 (SBS2008) with built in DHCP, DNS … and VPN connection for remote users from outside. For this PPTP I create dst-nat for port 1723.

In future we open 2 branch offices (A and B). I want all traffice from A and B go outside to internet through HQ (because stand-alone protocol/anti-spam cacher).

To create Point-to-point between branches MT and HQ MT i need port 1723 who I already dst-nat for SBS2008 functionality.
Plus for connection between A and HQ I need pppoe.
What sugestions to create Secure tunnel between A and HQ and B and HQ

Mocha
p.s. exchuse about my bad english.

2

Before dst-nat rule add accept rule where destination is B and source is A (or vice versa, depending which is the server). That way connection from another office is not dst-natted.