so, i have an extreme distaste for comcast because those jackasses have a traffic cap in my area and charge an extra 50 if you exceed it which is (the cap) pretty damn low. i wanted to switch to centurylink (fiber) however their modem is blocking my sub-network dhcp requests. i have their router/modem connected to my server and my server does dhcp requests and all that fun stuff for my network underneath.

so, my server can use dns but any device under that cannot. if i create a vpn tunnel, then dns traffic runs fine but a naked dns request will get blocked 100% of the time by their modem/router. so it is blocking all my iot devices, my rokus, my work computer and everything that cannot run a vpn on start-up through it.

as usual, the useless "techs" at centurylink can only parrot "it is my network"...blah, blah, blah when i have proven it is their modem/router blocking the traffic.

i need to figure a way around this or i have to go back to paying 120+ for internet. can linux (fedora 30) be configured to connect to pppoe directly (thus eliminating the use of their router/modem) or can someone help me figure out another way around this?

I use a Linux router with two ethernet ports as my firewall. One talks to the ISP, and the other provides NAT, DNS and DHCP for my internal network. In fact, I had to set up a second internal subnet due to work-from-home which has a VPN and its own wi-fi router. This beats worrying about any ISP-imposed limits.

thanks smallpond. i have the same set-up. the issue is that when i have my server connected to the router with the pcs on the network of my server, the f-ing centurylink router deletes (or drops) all the dns requests unless the traffic is encrypted. now, there have been many discussions about that so it is sufficient to say that i cannot just vpn all my traffic. so i need a way to get the router to stop deleting my requests. one way is remove it and have linux communicate directly with their network but in order to do that, it must be able to login correctly. i am not sure if this is possible thus the question.

the other way is to figure out why the router is deleting (or dropping) dns requests, i am going to work on that because those incompetant f-ers at centurylink are as useless as you can get and dont even remedially understand what i am talking about.

Make your encrypted requests from the Linux server, and have it be a caching-only nameserver on port 53 for your internal network.

In your dhcpd.conf what are you pushing to the clients for DNS server?