Hello Dan, > Can you run an FTP server on the BIH host, and have it do active mode > transfers and passive mode transfers? Could you elaborate the scenario? You assume BIH host taking FTP sever. I'm not sure whether following scenarios are correct There are two possibilities Option 1: +---------------+ |BIH(FTP sever) |----------NAT64-------FTP Client +---------------+ Option 2: +---------------+ |BIH(FTP sever) |--------------FTP Client +---------------+ In the case of Option 1, it can't work since NAT64 couldn't support IPv4 initiated session In the case of Option 2, it could work if BIH do ALG BTW, if BIH takes the role of FTP client, I guess it works in both active and passive mode when NAT64 do ALG If there is something wrong, please correct me Many thanks Gang _______________________________________________ Ietf mailing list Ietf@xxxxxxxx https://www.ietf.org/mailman/listinfo/ietf