I've had no problem at all with networking Sheepshaver *or* BasiliskII on recent linux-i... but I 've always used either the slirp or tun drivers, not sheepnet. I guess the sheepnet driver is the "easy" way to get straight Appletalk working but the only file servers I've ever connected to supported Appletalk-over-IP (IE, NetaTalk), which any driver works fine with.