router security

From: Christian Christmann (plfriko_at_yahoo.de)
Date: 12/30/04 

Date: Thu, 30 Dec 2004 21:48:06 +0100

Hi,

I've a DSL router with a firewall. Behind this
router my Linux box is running.

Nmap indicates the following ports:

PORT STATE SERVICE
21/tcp open ftp (this is my forwarded xmule-port)
53/tcp closed domain
113/tcp closed auth
1720/tcp open H.323/Q.931
61441/tcp closed netprowler-sensor
65301/tcp closed pcanywhere

Is it possible to get access to my Debian system
through the router from outside? If so, how could
an attack look like?

Thanks
Chris

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