Internet service providers

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.

USA

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

Found errors? Think you can improve this documentation? Simply click the Edit link at the top of the page, and then the icon on Github to suggest changes.