Add Utility to Mask Hotspot data as "on-device" data

[parker-stephens]

I've added an option to add some iptables/ip6tables rules that would mask what would normally be counted as hotspot data in the T-mobile dashboard as "on-device" data, that would allow a user on an unlimited plan to have unlimited high-speed data on the hotspot and its connected devices, instead of 5GB/40GB or whatever a plan offers at high-speed which would then be throttled to 3G.

This would not bypass any sort of network-management or video throttling that may be apart of a customer's plan's terms. Also if a customer is on a straight-up limited data plan, this would not work either.

There's a good read-up here explaining what TTL rules do.

Great work on the project btw!

[parker-stephens]

I will also add, that to verify that this is working, any traceroute to an IPv4/6 address should end 1 hop after the hotspot. I've attached a picture below of what it looks like when the rule is working properly.

[c-herz]

Apologies for taking so long to review this, I just happened to see it! I like the option you added, but there are just a few small things to change. All of them just affect integrating the function into the rest of the script; none of them affect the feature you added itself. Also, there's a typo or two I noticed. Great work though, and I appreciate you adding to the project!