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Remote access to a router with three data sim

Bubblesthefish6

ULTIMATE Member
These are the two settings I got with my SIM.
Screenshot_2021-06-11-20-43-18-488_com.android.settings.jpg
 

kommando828

ULTIMATE Member
I added a 3internet APN using 3internet2 as the name and 3internet as the APN and got an IP in the 188.31 range, if I swap back to the Three 3internet supplied one I get one in the 10.29 range. Seems the setup file sent by Three for the pixel 3a is wrong on the APN or got corrupted on route plus only gives the one APN and as its greyed out cannot be corrected.
 

eccles

Pro Member
Can anyone get port forwarding to work from Three? When I first subscribed it was simply a matter of allowing a single incoming port through my software firewall. Then that stopped about three months ago. Now no matter what I try all incoming ports are blocked.
 

TTJJ

ULTIMATE Member
Can anyone get port forwarding to work from Three? When I first subscribed it was simply a matter of allowing a single incoming port through my software firewall. Then that stopped about three months ago. Now no matter what I try all incoming ports are blocked.
I can’t say for certain but that seems to be a trend amongst mobile providers currently as a security measure. For the significantly vast majority of people an incoming port presents more of a security risk than anything else as most people wouldn’t need to open ports for anything so they’re closed off at the providers end via a firewall.

Of course they’re not just going to open ports for people either, so you’d need an alternative. You have a few options though - if your router or another device is capable you could set up a Cloudflare Argo tunnel (free) or get local network access via Zerotier. Always the VPN option also.
 

twocats

Regular Member
Can anyone get port forwarding to work from Three? When I first subscribed it was simply a matter of allowing a single incoming port through my software firewall. Then that stopped about three months ago. Now no matter what I try all incoming ports are blocked.
I am using a VPN but I temporarily opened a port, on my Asus Router, to connect to one of my cameras and it connected ok.
 

twocats

Regular Member
Connected via IP, I hadn't logged into the VPN.
I tested it via a external port open checker and it said it was open.
Once I deleted the port forward entry it confirmed it was stealth.
 
Last edited:

eccles

Pro Member
Thanks for the comments guys.
I have a spare PC and a laptop running Win7 that I haven't touched which also show my forwarded port as closed. I use 3internet apn. The wan IP address is 188.28.xx.xx. If I set up an apn with three.co.uk the wan address is 10.xx.xx.xx so presumably this uses cgnat. Ports are also blocked but that is expected. I have set up a "virtual server" which is what Huawei calls port forwarding but in the past with the B525 that wasn't necessary, it just worked. The only thing I can come up with is that Three disabled it for my account. Possibly because I am using a phone account?
 
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