Strange tcpdump behavior?

[Paul Goyette <paul%whooppee.com@localhost>]

While looking for some other problem, I noticed the following strange 
output from tcpdump.  Pay close attention to the UDP port numbers in the 
following:

14:37:13.609510 IP (tos 0x0, ttl 64, id 20218, offset 0, flags [none], 
proto UDP (17), length 152, bad cksum 0 (->3197)!) 
quicky.155202703 > speedy.nfs: 124 getattr [|nfs]

14:37:13.609604 IP (tos 0x0, ttl 64, id 41145, offset 0, flags [none], 
proto UDP (17), length 140) speedy.nfs > quicky.155202703: reply ok 112 
getattr DIR 755 ids 0/0 [|nfs]

14:37:13.609653 IP (tos 0x0, ttl 64, id 20219, offset 0, flags [none], 
proto UDP (17), length 152, bad cksum 0 (->3196)!) quicky.155202704 > 
speedy.nfs: 124 getattr [|nfs]

14:37:13.609697 IP (tos 0x0, ttl 64, id 41146, offset 0, flags [none], 
proto UDP (17), length 140) speedy.nfs > quicky.155202704: reply ok 112 
getattr DIR 755 ids 0/0 [|nfs]


----------------------------------------------------------------------
|   Paul Goyette   | PGP DSS Key fingerprint: |  E-mail addresses:   |
| Customer Service | FA29 0E3B 35AF E8AE 6651 |  paul%whooppee.com@localhost   |
| Network Engineer | 0786 F758 55DE 53BA 7731 | pgoyette%juniper.net@localhost |
----------------------------------------------------------------------