How To Open Nat On Comcast Xfinity Standard Modem

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Jorge Siverio: Worked flawlessly. Steps are outdated obviously ... but the core is still there. Thanks!

Aly Rojas: thank you so much it work

JC 4: Thanks

Nick Setzer: Wow, you have no clue what you are talking about. Almost nothing you said was accurate.

For all here wondering how to open your NAT, simply:
-log into comcast wireless gateway
-go to advanced
-type your Xbox's IP
NOTE: you will need to configure a static IP for your Xbox prior to completing these steps. If you modem is set to it's defaults, the settings below are a safe bet.

IP - (randomly chosen IP within subnet, but generally lower IPs are taken first, so 240 is generally unused, but I would recommend you check)
Subnet mask -
Gateway -
DNS 1 - (Google DNS)
DNS 2 - (Google backup DNS)

DesiredHeadshot: dont need port triggering. just forwarding and Punp options enabled. worked for me.

Billy Bowlin: On your port forwarding screen yours say private ports and public ports how did you get that. I need to forward some external ports to different internal ports. How do I do that with a xfinity router

mirta candreva: lost me at port triggering it asks for more numbers

michael shanks: thanks a lot this was very helpful

TheToekutter: Next time maximize your browser. LMAO

DarkUndeadSpawn: how can I open nats for wii u and xbox 1 and pc? and 8 is the maximum I can add. is there anything I must do to open the nats for every console?

XeXLoaded: Can someone teach me how to change my ip I am told by Comcast that the router I use is a dynamic up but turning off and on the router doesn't work

C.J. Burgess: This helped! Thanks so much!

Vauun: Listening to people try to talk about networking is the most frustrating crap when they don't understand networking.

Mr Rude An Belligerent: I did all this and it still acts up.

Thatoneguyihate: You very CLEARLY dont understand what youve done or didn't do it yourself. Youre all over the place, confused, and wrong about so much...... thanks for the waste of time.

Louis Williams: YOUR'RE A LIFE SAVER!

DeadlyDragon: is a reserved address it is the broadcast address no device can hold this ip address

Corey Norman: Thank u so much only had to do DMZ for xb1

Mike Stayduhar: You're my hero, worked no problem. Didn't have to restart the modem/router, just had to restart my Xbox One once I finished the set up. Just to make sure, on the Xbox I hit the Xbox button, then went to: Settings-> Network-> Network Settings-> Test Multiplayer Settings-> Hit RB, LB, RT, LT at the same time once it said my connection was good and there it is. NAT Type: Open / Detailed NAT information: Your network is behind a cone NAT. So I'll copy and paste this explanation here...

There are four types of NAT as follows:

Full Cone NAT (Static NAT)

A full cone NAT (also known as a one to one NAT) is the only type of NAT where the port is permanently open and allows inbound connections from any external host. A full cone NAT maps a public IP address and port to a LAN IP and port. Any external host can send data to the LAN IP through the mapped NAT IP and port. If it tries to send data through a different port it will fail. This type of NAT is also known as port forwarding. This is the least restrictive type of NAT; the only requirement is that the connection comes in on a specific port (the one you opened).

Example – My PC has a website running on port 80. I create a one-to-one rule that maps the router WAN IP of to with port 80 to port 80. Any external host that sends data to on port 80 is NATed (and sent) to port 80.
Note: the port numbers do not have to be the same; I could run my website on port 56456 but create the NAT mapping to forward port 80 to port 56456. This gives the appearance to the public Internet that my website is on port 80. A connection attempt on any other port is dropped.

Restricted Cone NAT (Dynamic NAT)

A restricted cone NAT works in the same way as a full cone NAT but applies additional restrictions based on an IP address. The internal client must first have sent packets to IP address (X) before it can receive packets from X. In terms of restrictions the only requirement is that packets come in on the mapped port and from an IP address that the internal client has sent packets to.

Example – My PC makes an outbound connection to a website ( with my source IP and source port 56723. The NAT creates a (dynamic) mapping to my PC using source port 56723. Packets that arrive with a source IP of (the website IP) using a destination port of 56723 (which was the outbound NATed source port) will be accepted and sent to my PC. Connection attempts from any other IP using the correct port of 56723 will be dropped. Connection attempts from the correct IP with a destination port other than 56723 will also be dropped.

Port Restricted Cone NAT (Dynamic NAT)

A port restricted cone NAT acts in exactly the same way as a restricted cone NAT but applies restrictions to ports also. Where a restricted cone NAT will accept connections from any source port a port restricted cone NAT restricts this further by only accepting connections from the IP address and port it sent the outbound request to.

Example – My PC makes an outbound connection to website IP on port 80 (destination port). The NAT maps my source IP to the WAN IP of and source port 56723. When the website sends packets back it must have it’s source IP as, destination port as 56723 (like a restricted cone NAT) but in addition the source port must be 80. If any of these three are different a port restricted cone NAT drops the connection.

Symmetric NAT (Dynamic NAT)

A symmetric NAT applies restrictions exactly the same way as a port restricted cone NAT but handles the NAT translation differently. Symmetric NAT is more complicated and has it’s own unique problem so I have wrote a separate article dedicated to Symmetric NAT and It’s Problems.

Valhallic Group: Wanted to post to say this does work for Xbox One.
All those trying to find out what the IPV6 IP for the DMZ step. Just go to connected devices, click on your Xbox One in the connected devices menu, it should pop up with a menu that shows a description that shows the IPv4 and the IPv6. Just copy it from there. I literally followed this guide after trying so many and it worked so well. I loaded up a GTA 5 online session in less than a minute with other people. My usually story for the past year has been to close my game app and restart over and over till I'm able to join a session. I am glad to say I have restarted my Xbox now about 10 times and it has stayed Open Nat type and I have no issues joining games, parties or online matches. Thanks @tutsamillion !
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How to open nat on comcast xfinity standard modem