I've tried to set up manual port forwarding on the comcast router, with no joy. Has someone made this work, and if so can you explain the steps necessary to get it working?
Comcast has "helpfully" moved some of my router control functions to its website (https://internet.xfinity.com/) at least in my area. I set up a reserved IP address (on the router's local web page) so my 6500 will always have the same IP. Then I set up the forwarding for ports 4993 (UDP) and 4994 (TCP) on the external Xfinity site.
I could give more details, but things might be different in your area, or you might have a different router.
73 Martin AA6E
@Kevin - what do you get it you select the SmartLink option for your radio in your radio chooser?
That is a connection that goes out to SmartLink and returns back, with everything on your Xfinity/Comcast network. If it works it then suggests your SmartLink problems are at your AT&T cell hookup for your iPad.
GL & 73,
As Martin mentioned above, I too avoid UPNP. I use either a Maestro or Windows tablet. For me, manually forwarding the two necessary ports, 4993UDP & 4994TCP, is easier & much more likely to yield a stable result than relying on an automatic scheme that might act unpredictably.
Since you didn't say which modem you are using, setup advice isn't possible here.
You might consider buying your own modem for Comcast. Motorola labeled modems are widely available & it will save you $10 a Month on your Comcast bill.
I also have telephone Service with Comcast so I needed a modem that would handle that as well. I bought a refurbished Comcast Arris TG826 on eBay & set it to "Bridge" mode. If you don't want to navigate the setup screens, Comcast will do this for you when you activate the unit with them. This bypasses the modem's routing function.
With that you can buy an everyday $100 router of your choice & install it behind the modem. If you get a router that other Flex users have described here, you will, presumably, have full access to all its features including simple port forwarding, a manual plus access to good advice on this forum.
I frequently use my Maestro tethered to my AT&T Prepaid phone via the Internet & Comcast at home. It works well & you can look forward to good times with yours.
First, Xfinity allows you to either rent a modem or use your own. Direct from an Xfinity tech he said their modems are crap. Best to go and buy your own. You'll pay for it in a very short time not paying the rental.
I did this. I bought an Arris TG862 modem. What I found worked the best was to put this modem in "bridge" mode. Which means it is nothing more than a modem. No routing, firewall or anything.
Then I purchased an IQ Router based on the recommendations in this forum. That is what handles all the routing and it loves uPNP.
This solution works very nicely. You'll quickly pay for the modem and IQ Router in the savings of the rental.
Just my 2c
Mark - WS7M
I had used it in bridge mode with a good Asus router, but the Cisco by itself worked better for me. (More reliable)
Moral: Go ahead with your own router if you want, but you might try the Comcast unit first.