Filter DHCP through VPN tunnel

[Orfeus]

Problem: We have 2 sites connected via a VPN tunnel, each site used a different subnet with 2 dhcp servers at each end, NT4 domain not AD.

Some macines are now picking up dhcp address from the servers on the opposite side of the VPN tunnel, if you then renew the address the servers pick up the correct address from the local subnet.

Is it possible to set up a filter to prevent the dhcp traffic through the vpn and if so do I set up the protocols (dhcp is not in the protocol list) and the filter.

An help gratefully received.
Mark

 

[tmt7734]

DHCP uses ports 67 and 68. Add a filter to block these ports. It is not in the protocol list on SEF by default, you have to add it in. You do this on the protocols tree item, right click on protocols, new > protocol. Set the type as tcp source as 67 destination as 68. Be sure to click the show protocol in rule window box.