I am using a pair of Wavelan silver cards between 2 UDBs and quite happy with the performance. I routinely get about 5Mb/s on ftp transfers. (RH 6.1 + 2.2.14 + cs 3.13). However, I have a hard time with NFS over the link. The mount will hang for minutes when I access mounted fs and I get a lot kernel: nfs: task xxxxx can't get a request slot in the log file.