End of my rope w/ Comcast and port forwarding.
Sorry for the wall of text, but I've been through a lot of iterations and want to make my situation as clear as possible.
Been working on this problem for two days now without a working solution.
Here's my network setup:
Gateway is a SMCD3G-CCR currently in Bridge mode (according to Comcast)
Router is a Netgear WNDR3300 w/ DD-WRT
My goal is to open the ports required for Mumble and Source Dedicated Server, or get my computer into a DMZ to achieve the same.
Old network setup worked fine, with no open ports. Router was only device attached to the D3G-CCR, internet worked, I could access either the router just fine, and I could access the modem's options by switching my PC's ethernet cable to the modem's port.
First, I enabled DMZ on my router - set to the static IP of my computer - 192.168.1.129.
No luck, all ports closed.
After some research, I determined that my D3G-CCR was in routing mode and was applying its own firewall rules to my connection - so I enabled the modem's DMZ. I connected my PC directly to the modem and enabled DMZ on the modem's subnet - 10.1.10.10 for my PC.
No luck, all ports closed.
Confused, I instead decided to call Comcast and have them bridge the modem's connection to my router - some googling lead me to the conclusion that this was the solution I needed. I unplugged my router from the modem and plugged my PC in, then called up Comcast and had them set to work.
After a long and arduous phone call, the modem's settings were set, reset, changed around, and messed with remotely by Comcast.
The modem booted up, and connected. Great, I thought, I'm done!
I could not ping the modem. I could not reach its options page through its IP (10.1.10.1). I did, however, have internet. My WAN and LAN IPs were now synchronized - the modem was no longer acting as a router and its subnet was disabled.
Unfortunately....... the ports are still closed.
At this point my helpful Comcast rep seemed to run out of steam - he had no idea why I couldn't ping or connect to the modem, nor had an answer as to why my ports were still closed.
Thinking that perhaps I needed to re-introduce the router to the equation in order to finalize the network tree, I did so. First I reset DD-WRT to factory settings, then re-enabled DMZ to make sure it wouldn't block any connections.
Ports still closed.
That's where I stand - my PC connected through my default-settings (w/ DMZ) WNDR3300, and my D3G-CCR is acting as a bridge, inaccessible via web interface. My ports are still not opened. If I disable DMZ on my 3300 and set up port forwarding, there is no change.
I'm at the end of my knowledge and experience, here. I don't know what else to try, what else to ask Comcast to do.
Any help or advice would be greatly, hugely appreciated.
Thank you for taking the time out of your day to help me out.
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