Question how to egress Only on ipv4? using the comcast biz router model CGA4131COM

[luv2liv]

I got an expensive proprietary logistic software to handle inventory.
for some reason, the company wants to limit my access to their server. meaning the 3 computers i have can only access it at my house. if i go elsewhere, even to neighbors, the software will be useless. fine. i will have to follow their rules. here's the vendor's email:



I had to ask Chatgpt how. and this is what i got:



i called comcast. they gave me a static v4 account so i logged into my comcast router at 10.1.10.1. made the changes as recommended by cgpt.
strangely, when i go to https://ifconfig.me i still see my ipv6, not ipv4.
what am i doing wrong?
also, when i try to add 2 more computers, the comcast router gave me error saying my ipv4 from comcast was already used. so i have to pay more to get more static ip???
pls help. what are my options? i cant dump the software, that's not an option unfortunately.

 

[luv2liv]

no one? oh man

 

[bba-tcg]

I suppose that unless you have some compelling need for IPV6, you could put the Comcast modem / router in bridge (or pass-through) mode, put another user supplied router behind it and disable IPV6 on it.

Edit: You might try disabling IPV6 on your PC first to see if it'll achieve what you're after.

 

[ch33zw1z]

the advanced NAT picture looks to configure access into your network.

If you can’t disable ipv6 from your WAN to the remote IP, the I also suggest getting your own router and put the gateway in bridge mode.

Fwiw, I have Comcast business, gateway is bridge mode, have a router. Internet sees me as ipv4.

 

[bba-tcg]

no one? oh man

So, did you make any progress on this?

 

[DaaQ]

I got an expensive proprietary logistic software to handle inventory.
for some reason, the company wants to limit my access to their server. meaning the 3 computers i have can only access it at my house. if i go elsewhere, even to neighbors, the software will be useless. fine. i will have to follow their rules. here's the vendor's email:
View attachment 131330


I had to ask Chatgpt how. and this is what i got:
View attachment 131331


i called comcast. they gave me a static v4 account so i logged into my comcast router at 10.1.10.1. made the changes as recommended by cgpt.
strangely, when i go to https://ifconfig.me i still see my ipv6, not ipv4.
what am i doing wrong?
also, when i try to add 2 more computers, the comcast router gave me error saying my ipv4 from comcast was already used. so i have to pay more to get more static ip???
pls help. what are my options? i cant dump the software, that's not an option unfortunately.

View attachment 131332

You will need to have a static TP for each computer you are trying to use, unless, you set up to only have 1 of them use the static IP.
Out of curiosity, is that modem a Technicolor with 8 ethernet ports and quite large size that sits flat?

 

[marokra]

I can't believe I'm reading this. First things first: this is a *them* problem:
1. They need to limit access
2. They apparently don't understand that every network stack worth its salt, uses IPv6 preferentially.
3. They apparently can't deal with IPv6
4. They nevertheless have AAAA records published, otherwise they wouldn't be receiving IPv6 traffic from you.

So my first action would be to push back on this. Push back hard. You may not be able to give up the software, but you can absolutely use the threat of taking your money elsewhere.

There really are only a few ways of doing this:
1. Disable IPv6 completely on your router. This disables IPv6 for your entire network. This is completely unacceptable.
2. Disable IPv6 on the computers that run this software. This may have been a reasonable request in 2005, but it's unacceptable in 2025
3. Implement a NAT64 gateway and only route traffic destined to their stuff through it. The problem is that they're using AWS, so destination IPs could change without warning.