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In the firewall settings on a Netgear DG834GU modem/router I am trying to create an inbound rule that allows SMTP traffic (port 25) only from an address range (only allow mail from Postini anti-spam service).

Under WAN Users I select Address Range and enter start 74.125.148.0 and end 74.125.151.255.

An error appears when I try and save: "Invalid destination start ip, please enter again, Invalid finish ip, please enter again".

I also tried entering as an IP/subnet pair but same error.

Why wouldn't this work?

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up vote 0 down vote accepted

start 74.125.148.1 and end 74.125.151.254

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Yes, that worked. And I feel like an idiot for not thinking of that myself. Thanks so much. –  John Jun 3 '12 at 2:08
    
well I consider this a problem in the netgear interface... they should not assume 24bit netmasks for this application –  Mike Pennington Jun 3 '12 at 2:11
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