Along with Bill's comment about the (hopefully) typo.  You don't have  
a 2nd IP Address to assign to your firewall.  With a /30 subnet mask  
you will have only 2 valid IP Addresses, yours and your gateway.

Just for example.  If you have 192.168.0.0/30 as your network, you'll  
have 2 IP's available for hosts.  192.168.0.1 and 192.168.0.2.   
192.168.0.0 would be your subnet and 192.168.0.3 would be your  
broadcast address.  In your scenario, you would be assigned one of  
these host IPs, and your ISP would be the other (This would also be  
set as your gateway).

You said that you did one up from your modems static address, when in  
fact you would have to replace your airport with your firewall and use  
the IP Address you assigned to your airport, then put the airport  
behind it in a private subnet.


On Jan 15, 2008, at 9:32 AM, mtnbkr wrote:

>
> Michael Kennard wrote:
>> Hello,
>>
>> I feel like novice, I thought I knew what I was doing.
>>
>> I have a static IP from my ISP /30 address. I managed to get my  
>> airport
>> up and running with a fixed address for the mean time but want to use
>> the firewall instead.
>>
>> Here's what I have done, what have I missed?
>>
>> General Setup
>> Added ISP DNS servers
>>
>> WAN
>> Type to Static
>> IP to the 2nd IP address, one up from my modem static address
>> Gateway 255.255.255.252
>
> I'm guessing that you made a late-night typo, but 255.255.255.252 is  
> not
> a valid gateway address. It is valid netmask though for a /30.
>
> Your ISP will tell you your gateway. In your case it is probably one
> less than your first valid IP - just a wild guess though.
>
> --
> Bill Arlofski
> Reverse Polarity, LLC
>
>
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