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Allowing DHCP into the Firewall

I just posted a question about allowing DHCP request from my ISP into the Firewall.

I think I fixed it but would like your opionion. 

First. I went to Definitions/Networks and created a new Network

Name:Broadcast 
IP address:255.255.255.255 
Subnet mask:255.255.255.255

Second. I then go to Definitions/Services and created a new service.

Name:COX-DHCP 
Protocol:UDP 
S-Port/Client:67 
D-Port/Server:68

Third. I then go to Packet Filter/Rules and add a new rule.

From (Client):COX_DHCP 
Service:COX_DHCP 
To(Server):Broadcast 
Action:Allow

That seems to fix it. I am wondering if this is the right way to do this and if this is possibly a security risk?

Anthony


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