vpn protocols and ports

[kp]

i have installed and tested a win2k vpn with active directory on my lan.
works great.

when I am on the road and try to connect i am being filtered by one of my
routers at work

using tcpdump from a linux box i see admin prohibbited filters from one of
the routers

anyone know off hand which ports and protocols are used for win2k vpn?

kp

 

[Marc Reynolds [MSFT]]

Hi,

PPTP uses TCP port 1723 and GRE (IP Protocol 47).


Thanks,
Marc Reynolds
Microsoft Technical Support

 

[DJ]

But if you use IPSec with L2TP - it's also IP port 50 for
ESP header to follow. However if you use NAT-T IPSec then
what you are lookin for UDP 4500. SO :

L2TP - User Datagram Protocol (UDP) 500, UDP 1701
NAT-T - UDP 4500
ESP - Internet Protocol (IP) protocol 50