I'm trying to host a small web server from my home network; however, I have not been able to successfully port forward ports to the local server. My current network topology looks like this:

Cable Modem/Router -> Secondary Wireless Router -> Many computers (including server)

The modem/router I'm using is a Cisco (Scientific Atlantic) DPC2100, provided by my ISP. The wireless router that I'm using as the central hub to my home network is a Linksys E3000. The computer being used as a server is running Ubuntu 10.04 Server Edition. The main issue is that I can't access the server remotely, using my WAN IP address. I have port forwarded my wireless router; however, I believe that I need to somehow set my modem to bridge mode. As far as I can tell though, this isn't possible.

Here are the various IP address settings:

DPC2100

WAN: 69.xxx.xxx.xxx
Internal IP: 192.168.100.1
Internal Network: 192.168.7.0

E3000

IP Address: 192.168.7.2
Gateway: 192.168.7.1
Internal IP: 192.168.1.1
Internal Network: 192.168.1.0

Server

IP Address: 192.168.1.123
Gateway: 192.168.1.1

Now I can do an nmap at various nodes, and here are the results (from the server):
nmap localhost: 22,25,53,80,110,139,143,445,631,993,995,3306,5432,8080 open
nmap 192.168.7.2: 22,25,80 (filtered),110,139,445 open (ports I have forwarded in the E3000)*
nmap 69.xxx.xxx.xxx: 1720 open

*For some reason, I can SSH into the server at 192.168.7.2, but not view the website.

Here are also some other settings:

/etc/hosts/

127.0.0.1       localhost
127.0.1.1       servername
::1     localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

/etc/apache2/sites-available/default snippet

<VirtualHost *:80>
        DocumentRoot /srv/www/
        <Directory />
                Options FollowSymLinks
                AllowOverride None
        </Directory>
        <Directory /var/www/>
                ...
        </Directory>
        ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/
        <Directory "/usr/lib/cgi-bin">
                ...
        </Directory>
        ErrorLog /var/log/apache2/error.log
        LogLevel warn
        CustomLog /var/log/apache2/access.log combined
    Alias /doc/ "/usr/share/doc/"
    <Directory "/usr/share/doc/">
        ...
    </Directory>
</VirtualHost>

Let me know if you need any other information; some stuff probably slipped my mind.