need help debugging port mapping/server setup

[Kevin Smith]

Thanks to Doug and help from others..problem solved...
With the help of tcpdump, I learned that packets from ssh were arriving at
the host, however the port was being blocked by the local firewall which I
configured to open.  The packet forwarding from the router was working all
the time.




On Sun, Aug 10, 2008 at 4:06 PM, Kevin Smith <k2msmith at gmail.com> wrote:

> I have my freebsd system configured with a static IP behind an Apple
> Airport Extreme router using ethernet connection rather than wireless.
>  I am trying to set up dynamic dns (with dyndns.com service) and I
> would like to open port 80 and others so that I can use my freebsd
> system as a web server.
>
> My freebsd system is set up with ddclient to associate dynamic ip
> address of router (I have DHCP connection to my ISP,  the local
> connnection to my freebsd sytem is static ip address.
>
> Everything appears to be working and I am able to try to telnet the
> dyndns hostname and it returns the correct address of my router, but
> it does not appear that the router is forwarding the port request to
> the freebsd system.  The port tools on the website for dyndns.com
> return that the ports I am testing  are closed.  (80, 21, 23)
>
> How do I debug this ?  The AE router as a syslog that I have set for
> the highest level of debugging, but I do not see any port mapping
> requests in the.  The router is set of for NAT enabled and I have
> entered the static IP address of my freebsd system associated with the
> desired ports that I want.  A call to my ISP confirmed (at least they
> told me) that they do not block any ports.
>
> Any ideas on where to start ?
>
> Thanks!
>