If the DS does shutdown the worldwide DNS system, or if they just delete entries for the conservative sites, you can set up a home DNS server in advance that can maintain the missing dns entries to keep you online. Here’s an easy one for Windows Macines https://simpledns.plus/ and linux machines would need to use something like DNSMasq.

Instead of a full dns server, you may be able to just point your dns server to one of these special purpose dns server, as long as they aren’t poisoned too, but we won’t know that until SHTF day. It info worth holding onto until that day tho. https://www.lifewire.com/free-and-public-dns-servers-2626062

If the DS does shutdown the worldwide DNS system, or if they just delete entries for the conservative sites, you can set up a home DNS server in advance that can maintain the missing dns entries to keep you online. Here’s an easy one for Windows Macines https://simpledns.plus/ and linux machines would need to use something like DNSMasq.