How come dd if=/dev/zero of=/nfs/dev/null does not send packets over the network?

[Piszcz, Justin Michael]

root@jpiszcz:~# mkdir /p500/dev
root@jpiszcz:~# mount 192.168.0.253:/dev /p500/dev
root@jpiszcz:~# echo blah > /p500/dev/null
root@jpiszcz:~# ls -l /p500/dev/null
crw-rw-rw-  1 root sys 1, 3 Jul 17  1994 /p500/dev/null
root@jpiszcz:~# dd if=/dev/zero of=/p500/dev/null

6179737+0 records in
6179736+0 records out

Instead it treats it as a local block device?

Kernel 2.6.5.


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