Can't Port Forward to 2nd Router

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Kaaji1359

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Jun 1, 2012
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Hello,

I'm trying to make a Minecraft server so I can play with some friends. I have 2 routers, one that Comcast gave me (TC8305C), and an Asus RT-N66U, which I'd prefer to connect to. When I connect to the Comcast TC8305C WiFi and enable port forwarding for Minecraft (25565), people can connect to my server.

The issue comes in when I am connected to my Asus RT-N66U router. I've enabled port forwarding on my RT-N66U, but I think I need to have Port Forwarding on the TC8305C directed to my RT-N66U, and then have the RT-N66U port forwarded to 25565.

However port forwarding on the TC8305C does not let me enter in an IP address - it only gives me 10.0.0.x.

Am I going about this issue wrong? How do I solve this problem, or is there another ? Any help would be greatly appreciated. Thank you.
 
Solution
royalcrown
you need to run the comcast TC8305C in "Bridge Mode" also called, "Bridging Mode" sometimes. I run my Comcast supplied Arris Gateway this way.

What this does is disable ALL the "ROUTING" it does and just lets everything pass straight through basically. You need to do this to avoid double NAT.
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royalcrown

royalcrown

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May 31, 2006
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you need to run the comcast TC8305C in "Bridge Mode" also called, "Bridging Mode" sometimes. I run my Comcast supplied Arris Gateway this way.

What this does is disable ALL the "ROUTING" it does and just lets everything pass straight through basically. You need to do this to avoid double NAT.
 
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Solution
drtweak

drtweak

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Sep 17, 2012
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^^^ Yes what he said above. Now besides the ASUS is anything else connected to the comcast router?


Now you can try this

log into the router at 10.0.0.1 default username/password is admin/password. Under Gateway -> Connection -> Local IP Network the top option is Bridge Mode


Also from looking things up it seems like you may have to call up comcast themself and have them do the bridge mode. I know a lot of cable companies are now not allowing anyone to access the router which is a load of BS and why i always tell people to buy their own Cable modem.

 
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Kaaji1359

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Jun 1, 2012
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Thanks for the replies.

FYI I ended up figuring it out: I needed to port forward to 10.0.0.2 (which was my second router), not the 192.xxx.x.x number I thought I had to port to. I was looking at the wrong set of numbers...

With regards to Bridging, I found that option and enabled it but as you said my internet would not work at all. I ended up finally disabling it and my internet came back several minutes later.

Since nothing is connected to my Comcast router, is there any advantage whatsoever in enabling Bridge mode? My second router transmits 5GHz, so I wouldn't be having an issue with interference. And I'm not too sure what "double NAT" is? Just not sure if it's worth dealing with calling Comcast.
 
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royalcrown

royalcrown

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The benefit to bridge mode is that some applications don't like double NAT. Nat or Network Address Translation is what takes your "public" IP, say 79.82..48.65 for example and translates it to your "private" IP such as 10.0.0.x or 192.168.1.x. Nat lets you have a bunch of devices on your LAN (which is your side) share one IP address (which is the "public" or WAN side).

When a device sends information through the router(s) the information "packets" get some extra stuff added to them so that the router knows which device wanted the information. This information sometimes gets messed up if both devices do NAT. Essentially on router is modifying some packets, which get remodified during the second NAT.

Bridge Mode disables WIFI, NAT and ROUTING on the Comcast Gateway and you just do the port forwarding on the ASUS which handles all the NAT and the routing.

If you can.t get internet in BRIDGE MODE, make sure you have your ASUS' WAN port going to port TWO on the Comcast gateway. The manual is in there and it says port two on mine, although Port one also works.

Then try resetting them both by just poking and not holding the reset buttons. Sometimes ASUS are picky about which one is set first, I had a friends AC-66u and that thing was crabby. I run a Netgear now but bridge mode should work regardless. You may have to go through the ASUS setup wizard to get it working right, but it should do it without any tweaking. When you are in bridge mode what is happening is that your public IP is just being passed right through the comcast gateway straight to the ASUS router.



 
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royalcrown

royalcrown

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The other benefit of running your Gateway in bridge mode is that your router can handle more users without crashing then your Arris Gateway.

Also some applications don't do double network address translation well. What network address translation is is it's a let you share one IP address such as 79.82.39.47 on the WAN and side or public side and converts that to an address such as 192.168.0.x or 10.0.0.X. This way it led to a whole bunch of devices on your network share one public IP address.when I device that's on your network asks for information what happens is that information packet get some information added onto it saying which computer it came from so that the router knows where to send replies back to. When you do double that the header that gets changed gets really changed when it goes to the second router and goes to Nat the second time. When you run your gateway in bridge mode to Avis will do all the routing and the NAT so you won't have that double NAT problem.

The other advantage is that they gateway Comcast gives out is pretty crappy and can't handle a bunch of users downloading or torn thing at once whereas if you have a decent router it can handle the load so that's why I run my gateway in bridge mode. Sorry for the text while I had this all typed up in Tom's hardware deleted it so I'm dictating it into my iPhone to save time.
 
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royalcrown

royalcrown

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One thing if you can't get bridge mode to work with your router, sometimes A SUS routers are very picky. You probably need to put it in bridge mode and then run the Azores set up wizard to get it to recognize your Internet. I know my friends AC 66U was incredibly picky and we had to set it up a few times to get it to work. Also the manual in your Comcast gateway if it's like mine says to have that cord coming out of port 2 when it's in bridge mode and not port one. It lets me use it in both though so I don't know what the deal is, I'm running a crappy TC 862.
 
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