Linksys RV082 Open Ports

Hi,

I need some help here interpretting the results of a port scan on a router/firewall.

Behind the router there is a mail server, a web server, and a terminal server.

There is a VPN tunnel set up.

And remote administration is enabled (dumb, but not my choice).

The common ports I am familiar with and understand why they are open.

Open ports:

25/tcp open smtp

80/tcp open http

135/tcp filtered msrpc

137/tcp filtered netbios-ns
138/tcp filtered netbios-dgm
139/tcp filtered netbios-ssn

443/tcp open https

445/tcp filtered microsoft-ds

593/tcp filtered http-rpc-epmap

1723/tcp open pptp

2555/tcp open unknown

3000/tcp open ppp

3389/tcp open ms-term-serv

5554/tcp filtered unknown

8080/tcp open http-proxy

9996/tcp filtered unknown

Thanks.