weird NFS problem ?

[Aziz Kezzou]

Hi all,
I am experiencing a weird problem while mounting nfs files. 

Configuration :
- NFS client : FreeBSD 5.3 running on QEMU, IP = 192.168.0.2
- NFS server : FC3, the host, IP = 192.168.0.1

Firewalling: 
absolutely everything is authorized from 192.168.0.2 on 192.168.0.1

Problem :
some UDP ports on 192.168.0.2  are unreachable without any reason I know of ?!!

Command:
arwen# mount -t nfs 192.168.0.1:/home/akezzou/pfe/cvs /mnt/host
[udp] 192.168.0.1:/home/akezzou/pfe/cvs: RPCPROG_MNT: RPC: Timed out
[udp] 192.168.0.1:/home/akezzou/pfe/cvs: RPCPROG_MNT: RPC: Timed out

Tcpdump output :
[root at eowyn bin]# /usr/sbin/tcpdump -i tun0
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on tun0, link-type EN10MB (Ethernet), capture size 96 bytes
21:04:51.560121 IP 192.168.0.2.675 > 192.168.0.1.sunrpc: UDP, length 56
21:04:51.561806 arp who-has 192.168.0.2 tell 192.168.0.1
21:04:51.564088 arp reply 192.168.0.2 is-at 52:54:00:12:34:56
21:04:51.564118 IP 192.168.0.1.sunrpc > 192.168.0.2.675: UDP, length 28
21:04:51.570214 IP 192.168.0.2.1117046890 > 192.168.0.1.nfs: 40 null
21:04:51.570368 IP 192.168.0.1.nfs > 192.168.0.2.1117046890: reply ok 24 null
21:04:51.575164 IP 192.168.0.2.954 > 192.168.0.1.sunrpc: UDP, length 56
21:04:51.576338 IP 192.168.0.1.sunrpc > 192.168.0.2.954: UDP, length 28
21:04:51.581561 IP 192.168.0.2.621 > 192.168.0.1.650: UDP, length 108
21:05:04.528129 IP 192.168.0.1.650 > 192.168.0.2.621: UDP, length 68
21:05:04.530154 IP 192.168.0.2 > 192.168.0.1: icmp 36: 192.168.0.2 udp
port 62 1 unreachable
21:06:01.613750 IP 192.168.0.2.1006 > 192.168.0.1.sunrpc: UDP, length 56
21:06:01.616083 IP 192.168.0.1.sunrpc > 192.168.0.2.1006: UDP, length 28
21:06:01.622336 IP 192.168.0.2.1117192688 > 192.168.0.1.nfs: 40 null
21:06:01.626734 IP 192.168.0.1.nfs > 192.168.0.2.1117192688: reply ok 24 null
21:06:01.637315 IP 192.168.0.2.843 > 192.168.0.1.sunrpc: UDP, length 56
21:06:01.641915 IP 192.168.0.1.sunrpc > 192.168.0.2.843: UDP, length 28
21:06:01.646715 IP 192.168.0.2.792 > 192.168.0.1.650: UDP, length 108
21:06:06.614378 arp who-has 192.168.0.2 tell 192.168.0.1
21:06:06.615755 arp reply 192.168.0.2 is-at 52:54:00:12:34:56
21:06:16.682754 IP 192.168.0.1.650 > 192.168.0.2.792: UDP, length 68
21:06:16.684556 IP 192.168.0.2 > 192.168.0.1: icmp 36: 192.168.0.2 udp
port 79 2 unreachable
21:07:11.659900 IP 192.168.0.2.764 > 192.168.0.1.sunrpc: UDP, length 56
21:07:11.662292 IP 192.168.0.1.sunrpc > 192.168.0.2.764: UDP, length 28
21:07:11.668228 IP 192.168.0.2.1117147813 > 192.168.0.1.nfs: 40 null
21:07:11.671916 IP 192.168.0.1.nfs > 192.168.0.2.1117147813: reply ok 24 null
21:07:11.676171 IP 192.168.0.2.693 > 192.168.0.1.sunrpc: UDP, length 56
21:07:11.683197 IP 192.168.0.1.sunrpc > 192.168.0.2.693: UDP, length 28
21:07:11.688238 IP 192.168.0.2.958 > 192.168.0.1.650: UDP, length 108
21:07:16.660731 arp who-has 192.168.0.2 tell 192.168.0.1
21:07:16.661668 arp reply 192.168.0.2 is-at 52:54:00:12:34:56

 
Any hint is greatly appreciated.
thanks,
-aziz