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Gmod - Unable to Connect from Internet. LAN Works Fine
Basic Info
Server OS: Ubuntu Release 12.04 (precise) 64-bit
Processor: i5 2500k
Game: Garry's Mod
Start Up Command: orangebox/srcds_run -console -game garrysmod +maxplayers 16 +map gm_construct -autoupdate
Admin Mods: None

Network and Bandwidth Info
Downlink: 107 Mbps
Uplink: 21 Mbps

Router: Netgear N600 WNDR3700 - Wired Connection
Comcast Router: SMC SMCD3GNV

Netgear is connected to the Comcast router, which pretty much only serves as a modem, but also performs routing functions like port forwarding

Local IP of Router: Netgear is on the LAN side
Between the two routers, the Netgear's address is and the Comcast router is

External IP:

Port Forwarding:

Comcast Router:

Netgear Router:

On the Netgear router:
Source1 - UDP
Source2 - UDP
Source3 - UDP
Source4 - TCP
Source5 - UDP
Source6 - TCP

hostname        "The Impeesa Staff"

sv_password        "saff"

rcon_password        ""

sv_voiceenable        "0"

sv_minrate         "0"

sv_maxrate        "20000000"

net_maxfilesize        "64"

sv_allowupload        "1"

sv_allowdownload    "1"

sv_lan            "0"

exec startup.cfg

Here's a diagram of my home network:

Now, to the issue. I have sv_lan set to 0, and I have TCP/UDP forwarded on 27015 to the IP of my server. However, although I can connect and play from my PC, none of my friends over the internet can see the server. They see this:

I have checked the port (even though it is forwarded properly) and I see that it is apparently closed:

I've tried googling for other possible ports to forward, so I've tried those as well. But to no avail.

Any ideas would be greatly appreciated.
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