Sorry, used the wrong term. By WAN I meant the broadband telephone line. Modem cards for dial up connections were common back in the day, but since ADSL and beyond I don't recall any commonly available products, USB winmodems aside. VDSL/Fiber capable cards would be very handy to build 100% FOSS broadband routers, but they seem next to unobtanium.
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Sorry, used the wrong term. By WAN I meant the broadband telephone line. Modem cards for dial up connections were common back in the day, but since ADSL and beyond I don't recall any commonly available products, USB winmodems aside. VDSL/Fiber capable cards would be very handy to build 100% FOSS broadband routers, but they seem next to unobtanium.