Adrian Knoth <a...@drcomp.erfurt.thur.de>: >(I really prefer the v6-mapped-v4 solution with a single > socket, thus eliminating this problem)
One little problem here is that it is possible to disable the IPv6-mapped IPv4 addresses at least under Linux and some BSD variants. For Linux, have a look at sys.net.ipv6.bindv6only. Some authors even recommend to do so for security considerations (for example, Murphy & Malone in IPv6 Network Administration, O'Reilly 2005). So the approach that maximizes the environments where it works out of the box is this: Call getaddrinfo with PF_UNSPEC and open a socket for each IP version it returns (usually this means two sockets on IPv6-enabled hosts, but this may change in the future... who knows?) If the connection handling code already makes use of one big select loop, this should not be *too* hard... Christian -- Dipl.-Inf. Christian Kauhaus <>< Lehrstuhl fuer Rechnerarchitektur und -kommunikation Institut fuer Informatik * Ernst-Abbe-Platz 1-2 * D-07743 Jena Tel: +49 3641 9 46376 * Fax: +49 3641 9 46372 * Raum 3217
