To find generic instructions on how to configure port forwarding, see Main configuration box
A "no" may cause problems for using your server or may require you to make additional configuration changes. Status in brackets indicates the default behavior.
|Service provider||Box (modem/router)||uPnP available||Port 25 openable||Hairpinning||Customizable reverse DNS||Fix IP|
|Cox||Multiple||Yes||No. Only for business class customer.||No||No||Yes, as a business class customer|
|Charter||Multiple||Yes||No. Only for business class customer.||No||No||Yes, as a business class customer|
|DSLExtreme||Multiple||Yes||Yes||No||No||Yes, extra charge.|
|AT&T||Multiple||Yes||No. Only for business class customer.||unknown.||unknown.||unknown.|
|Xfinity (Comcast)||Multiple||Yes||No. Only for business class customer.||unknown.||unknown.||Yes, as a business class customer|
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