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DHCP is only required if you are connected directly to a modem from your NIC. If you have a router or a proxy server that you connect through, you will only need DHCP if you use it to assign a local IP address to your machine on your LAN.

If your router, for example, is a DHCP server for your network, you need to have your router's LAN IP address handy. Since most routers are installed with the default of 192.168.1.1, we'll use that address for this example. If you have a direct connection, you will substitute your ISP's DHCP server IP address for "192.168.1.1" in your own rules. The rules will be the same for a directly connected user; the IP address in the first rule will be the only variation.

ALLOW
both directions
UDP
application ANY
single local port 68
single remote port 67
single remote address 192.168.1.1*
nolog - noalert
Notes: *For a router in many default configurations, substitute the IP address of your ISP's DHCP server as appropriate.

ALLOW
OUT
UDP
application ANY
single local port 68
single remote port 67
single remote address 255.255.255.255
nolog - noalert

Rule position: high

021102-513

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by gwion See Profile edited by JMGullett See Profile
last modified: 2007-05-31 16:43:37