i have a nfs server on a system running FreeBSD 6.1-RELEASE, serving two debian etch 2.6.16-2-686.
i have no problem mounting the exported dirs, nor when i copy from debian to frebsd, but when i try to copy from frebsd to debian the speed is hardly 300 kbits/s (it's a 100 Mbits LAN), here is the output of tcpdump

listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
15:42:44.501372 IP 192.168.2.2.3311850499 > 192.168.2.1.nfs: 132 getattr [|nfs]
15:42:44.501563 IP 192.168.2.1.nfs > 192.168.2.2.3311850499: reply ok 116 getattr [|nfs]
15:42:44.501793 IP 192.168.2.2.1023 > 192.168.2.1.nfs: . ack 1558094241 win 32739 <nop,nop,timestamp 2278477 144420689>
15:42:44.507386 IP 192.168.2.2.1042 > 192.168.2.1.domain: 48302+ PTR? 2.2.168.192.in-addr.arpa. (42)
15:42:44.507813 IP 192.168.2.1.domain > 192.168.2.2.1042: 48302 NXDomain 0/1/0 (119)
15:42:44.517183 IP 192.168.2.2.1042 > 192.168.2.1.domain: 53966+ PTR? 1.2.168.192.in-addr.arpa. (42)
15:42:44.519310 IP 192.168.2.1.domain > 192.168.2.2.1042: 53966 NXDomain 0/1/0 (119)
15:42:44.905579 IP 192.168.2.2.3328627715 > 192.168.2.1.nfs: 144 read [|nfs]
15:42:44.906321 IP 192.168.2.1.nfs > 192.168.2.2.3539352609: reply ERR 1448
15:42:44.906609 IP 192.168.2.2.1129580487 > 192.168.2.1.nfs: 0 proc-795634018
15:42:44.906434 IP 192.168.2.1.nfs > 192.168.2.2.4241602810: reply ERR 1332
15:42:44.906785 IP 192.168.2.2.1672162450 > 192.168.2.1.nfs: 0 proc-795634018
15:42:45.143320 IP 192.168.2.1.nfs > 192.168.2.2.3328627715: reply ok 1448 read [|nfs]
15:42:45.143710 IP 192.168.2.2.1023 > 192.168.2.1.nfs: . ack 4229 win 32768 <nop,nop,timestamp 2278638 144421331>
15:42:45.149864 IP 192.168.2.2.3345404931 > 192.168.2.1.nfs: 144 read [|nfs]
15:42:45.150131 IP 192.168.2.2.3362182147 > 192.168.2.1.nfs: 144 read [|nfs]
15:42:45.150312 IP 192.168.2.1.nfs > 192.168.2.2.1023: . ack 432 win 16516 <nop,nop,timestamp 144421338 2278639>
15:42:45.150491 IP 192.168.2.2.3378959363 > 192.168.2.1.nfs: 144 read [|nfs]
15:42:45.150630 IP 192.168.2.1.nfs > 192.168.2.2.3345404931: reply ok 1448 read [|nfs]
15:42:45.150735 IP 192.168.2.1.nfs > 192.168.2.2.413521248: reply ERR 1448
15:42:45.150863 IP 192.168.2.1.nfs > 192.168.2.2.2329713261: reply ERR 1448
15:42:45.150989 IP 192.168.2.1.nfs > 192.168.2.2.283819777: reply ERR 1448
15:42:45.164267 IP 192.168.2.2.1023 > 192.168.2.1.nfs: . ack 7125 win 32768 <nop,nop,timestamp 2278643 144421338>
15:42:45.164664 IP 192.168.2.1.nfs > 192.168.2.2.1606878495: reply ERR 1448
15:42:45.164779 IP 192.168.2.1.nfs > 192.168.2.2.1638989571: reply ERR 1448

and so on..
any clue?
has anyone encountered this problem with freebsd-linux?
thanks.