9/20    I am running NAT on an Extreme Networks switch connected to a
        Cisco switch at GigE speeds. Copying a file across the same link
        w/o using NAT gets about 25 MB/sec, but with NAT turned on I get
        2.5 MB/sec. The CPU is 98% idle and there is plenty of RAM. I know
        that NAT in s/w has an overhead but could it realistically be a
        factor of 10 slower?
        \_ what kind of file copy?
           \_ NFS or SFTP. Same symptoms with either.
        \_ Are you sure it is not your test platform that is slower? This
           seems really crappy. Are you perhaps having a duplex mismatch
           problem on the switch the NAT is connected to?
           \_ What test platform? You mean the one I am copying with? I
              said that I get 25 MB/sec with NAT off and 2.5 MB/sec with
              NAT on - using the exact same hardware. Therefore, I doubt
              it is a duplex problem or it would be present both times.