New modem/router - NAT/bridge issues

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enterthecookie

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Sep 18, 2010
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I recently got a SBR-AC1750 router and SB6141 Modem. I got internet to work by directly connecting modem to computer but had an amazingly insane trip trying to get this to work with the router.

I'll try to keep it short but what I am stuck on now is "NAT" There is a setting in my router that says NAT Mode and the three options are RoutedWithoutNAT, RoutedWithNAT and Bridged. I can get internet working when setting it to Bridged, but then that makes the Wireless on the router obsolete because then no wireless devices receive an IP address. Well I set a static IP, but they still did not get internet. So I had to switch back to RoutedWithoutNAT, then my wireless devices starting automatically getting IP - but no internet wireless OR wired....

I checked out my ipconfig while Bridged, went into my router and changed from DHCP to settings from ipconfig while Bridged, turned the NAT back on - first WITH and then WITHOUT, but it just won't get online if the NAT mode is not in Bridge mode...

Talked to support, went through power cycling, resetting to default, restarting... nothing. Put me on "hold" but hung up and never called back...

what the hell is going on
 
Solution
B
Pretty much what you ran into is the security the cable company has. They only give you 1 ip address which they lock to a mac address. The modem will pick the very first device it sees and will not check again until it is power cycled. Now what you could have done is put the mac address of your PC in your router wan port. The modem would think it was still the PC. Many router has this option just because of this problem, some modems that are owned by the ISP will not change even when you power cycle them.

Luckily the method you used works in most cases
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CN Shana

CN Shana

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almost shocks me to see that people even use a modem seperately from a router these days, i almost thought it was a thing of the past now, any reason your not just using an all in one cable router that you directly plug the coax into?
 
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enterthecookie

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Well the all in one from Comcast was really weak wifi wise and when I did some google searching, it was recommended to have separate modem and router.. I also tried an amped wireless range booster but it still wasn't working well.. But this has been very frustrating.. I'm thinking the router is just defective or something because it just won't get internet unless it's in bridged mode in the nat settings. Maybe I should just ask Comcast for a new upgraded all in one with better range


OK tech support figured it out! Connect modem directly to computer - reset modem factory - restart modem - right when lights go off unplug computer Ethernet, plug in Ethernet from modem to router (WAN port of course) and that's it! Now it will work with routing w/ NAT and etc..
 
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CN Shana

CN Shana

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Hey im glad you were able to figure it out, personally whether you know it or not, you are getting charged monthly for the devices you get from comcast, paying 5-6$ a month to rent that router/modem, theres almost no reason to be doing this, when you can just as easily purchase a router and get rid of the comcast one, comcast routers are almost always low quality routers as well, your much better off purchasing your own linksys cisco router modem combo, or netgear of the same like.
 
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bill001g

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Aug 9, 2012
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Pretty much what you ran into is the security the cable company has. They only give you 1 ip address which they lock to a mac address. The modem will pick the very first device it sees and will not check again until it is power cycled. Now what you could have done is put the mac address of your PC in your router wan port. The modem would think it was still the PC. Many router has this option just because of this problem, some modems that are owned by the ISP will not change even when you power cycle them.

Luckily the method you used works in most cases
 
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enterthecookie

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Yeah I totally messed up. This is the first router these guys put out. I knew their modem was great because I bought one for my dad a few years back and it was just amazing. So I thought about upgrading this All-in-one from Comcast, and when I saw their modem/router combo on Amazon, I just figured their routers would be amazing too. I mean don't get me wrong, it's cool so far and wifi speeds are a lot better, but the web management software is pretty damn limited at the moment... there was definitely no area to set a custom MAC id, or to spoof one, etc.. even my super old Netgear router had that probably 5+ years ago.

But thank you very much for that bit of information Bill, that actually helped me understand what happened a lot better.

Also, Shana, that was another reason I bought this modem and router... I was tired of paying comcast for a shitty all-in-one... I've been looking to switch for almost a year... just super lazy and kept putting it off since my main connection is hardwired anyway.


Another thing I just thought about... at first when I got it, I hooked up everything the way it is now, modem to router and computer to router. Then I realized - oh I have to activate this modem.. so I directly hooked it up to my computer and called Comcast to get the modem working and out of the way. That was a huge mistake... I should have just left it hooked up the way it is. Then when comcast activated it and sent out that IP - it would already be assigned to that router. Is that correct or am I trippin?
 
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bill001g

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Once you learn the order you must power cycle things with a cable modem all is fine. This is one of those things where the level 1 support guys script of power cycle the modem/router/pc actually can fix issues for people that have never seen this problem.
 
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