Question about public IP for SIM 4G

Black Mamba

@“x”#1327662 wrote:

I’m using the my sim in multi device and the I would like to open a port in one of my router to access it from the internet but operantly I don’t have a IP public, I called the Swisscom tech support but they don’t know what I’m talking about I found many questions about this topic in the community and all points out to a sub of 5.- CHF that solves this but the sale team have no idea about it.

Would you be able to point me to the right direction regarding this Topic.
Best regards
Zakaria

Black Mamba

@zaks-zum

You may have a public IP from the CGNAT range.
Usually an IP from the 100.9x.y.z range.
If so, you must request a CGNAT opt-out via MyService.

r00t

Hi @zaks-zum

As you probably already figured out, there is no clear indication if this option is still available.

A solution that always works: Reverse your idea and build a VPN from the router to an endpoint with a fixed IP/DDNS (i.E. a cheap VPS).

Also add a mechanism that opens the tunnel from the router, if it goes down for some reason (like scheduled ping, or gateway monitor)

I have been using this architecture for years now, works like a charm. 😉

Best,

r00t