New Xfinity modem not working with SmartLink - Help!

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Yesterday I tried to set up the new Xfinity wifi modem/router - Arris TG 1682G .   I can no longer get into my 6700 using SmartLink with my SmartSDR iOS software via the WAN.   SmartSDR iOS is still working fine within the LAN however   I tried to setup the port forwarding as suggested on the SmartLink Setup screen but no joy!    All had been fine with the previous Xfinity Modem an Arris TG 862G, which others on the forum used successfully.   Tried setting up the port forwarding through the modem portal on my computer but no luck.   Tried going through Xfinity web portal to externally set up the port forwarding but still getting the red light on SmartLink.    One option is to send the new modem back to Xfinity and stick with the old one but I am hoping that wouldn't be necessary.  Has anyone been successful with the TG 1682G?   Any advice appreciated.  Thanks
Jim NX3Z
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James Eastham

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Posted 2 years ago

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Chris Tate - N6WM, Elmer

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Charlie

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When i changed routers and had issues, I got the following from Flex Tech Support. It worked for me.

As in the setup one rule for the UDP port 4993, Starting port 4993, ending 4993, being sent to 192.168.1.136 Protocol - UDP
Second rule for the TCP port 4994 , Starting port 4994, ending port 4994, being sent to 192.168.1.136, Protocol - TCP

Then you should have a Static IP for your radio MAC address , 192.168.1.136 If you set this in the router, when ever the radio comes up , it will be assigned this address, you should not have to actually put that address in the static address of the radio..

Once you enter this, power the radio down , remove the DC , reboot the router, and power up the radio once the router has completely booted up ..

Then open SmartSDR -> SmartLink setup -> Link Test at the bottom .. be sure to click "Save"

The IP address is the one my router assigned to the radio. Yours will be different.

KJ4AUQ
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James Eastham Jr

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Thanks for the suggestions.  I have tried everything suggested with no success.  uPnP, static ip for radio, TCP and UDP ports forwarded.   I have a help ticket into Flex so we'll see what they suggest.
NX3Z
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James Eastham

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Well I’m still stumped, I’ve tried every possible combination including Flex tech support suggestions. UPnP or, manual port forwarding, made sure port forward was turned off when trying UPnP, forwarded 21040 and 22000 then tried 4993 and 4994 , no joy ....Ive seen postings with all these setup suggestions. Only one modem so no double NATs Always get a red test button result. Is it possible that this new Arris TG 1682 G just won’t work? Has anyone used this specific modem with success? As I said my previous modem from COMCAST Arris TG 862 G worked but it was much slower than this new one. The ONLY change I made is the modem. All port forward are the same, my Smart Ether VPN setup with SmartEther manual port forward works fine on this new modem. Smartlink works fine through the VPN. The only thing that won’t work is the Smartlink through the WAN . I guess if it ain’t broke don’t fix it is the answer here!
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Mark - WS7M

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I have the Arris TG862G which seems to be a different model.  I have mine in "bridge mode" which turns it mainly into a modem and use my IQ router to do all the important work.

No issues here.
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James Eastham

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My TG862G worked fine with Smartlink and WAN access.
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Bob - W7KWS -

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James,

Could this be the issue?

https://community.flexradio.com/flexr...
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Scott Russell - N1SER

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Get rid of the Xfinity modem/router and get your own equipment. Less trouble, more flexibility and won't cost you $ every month. For your average home user their stuff is fine but when you do more than just surf the web it's better to be in control of your own network.
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Ken - NM9P, Elmer

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What modem do you recommend for use with Xfinity? I just moved and they are the main players in this neighborhood.

I have an ASUS router but am thinking of buying my own cable modem to put in front of it.
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Bob Gerzoff, WK2Y

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I have an earlier model and no issues.  Recommended by the techs who came by my house once and Xfinity tech support. "It's the Cadillac unit.'  I use it with an iQRouter.
73, Bob

ARRIS Surfboard (16x4) DOCSIS 3.0 Cable Modem Plus AC1600 Dual Band Wi-Fi Router, 686 Mbps Max Speed, Certified for Xfinity, Spectrum, Cox & More (SBG10)
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Pat - WH6HI

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I use a Netgear CM700 which is approved for exfinity and other networks. In my case it is. Spectrum. Recently found cable delivery problem which which I used the logging on the CM700 to aid in trouble shooting. Tech found a bad connector on the poll end of cable. Log stays clean for many days now. This modem is Docsis 3.0 but newer modems have Docsis 3.1.
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Bob Gerzoff, WK2Y

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Funny you should mention the bad connector.  That's exactly what the tech found when I had them out.  He redid all of the connectors noting that the last tech had left too much pigtail sticking out and hadn't looped the coax enough so that water would drip off.  
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Scott Russell - N1SER

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Sorry Ken, late to the question. I would get the ARRIS Surfboard SB6183. No frills, just works. I don’t recommend the all in one stuff. Think of it like a shack in the box. Does good at everything, not great at any one. Plus if you have to replace the modem, it’s just the modem. If it’s the router, it’s just the router. This is $69.99 on Amazon.
(Edited)
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Scott Russell - N1SER

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Also to note, Comcast/Xfinity has their modem/router combo setup so it provides public WiFi. That’s how they get away with having whatever number hotspots all around the US. I don’t know about you, but don’t want my internet shared.
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AB4RW

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just checked my comcast router/modem, i have same setup, just upgraded mine a couple months ago, my works like a champ, no special setup or anything, 
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Bob G W1GLV

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I had the same modem/router when i subscribed to ATT. Very difficult to program Port Forwarding.
As far as I was concerned it was a piece of junk. I returned to Cox and used my own router and have been a happy camper since then.