Portscan: all 1000 ports filtered but tracert detects the device...why?

[SheaO <shea () pobox sk>]

Hi this might be a stupid question, im a bit of a newbie here, but maybe
someone can clarify it for me.

Im doing some portscanning with nmap on a IP-address, and get the result
that all ports are closed (even tried using nmap -PN xxx.xxx.xxx.xxx). When
I run a traceroute to a server on the same network, the router
(xxx.xxx.xxx.xxx) with 1000 filtered ports, shows up! How can it be a part
of the network if it's ports are all closed? 
Any suggestions? Clarification?


/Shea
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