PPP WAN types do not obtain DNS servers properly in 2.0.2-RELEASE
[Note: This has already been resolved in 5feadf7fca75866582af73834c8d2ab14edca456 - Putting an entry here for others to find]
In 2.0.2-RELEASE, PPP type WANs, such as PPPoE, do not obtain DNS servers properly. By consequence, if a user has defined no custom DNS servers, they can end up without functional DNS.
This is due to an issue in the ppp-linkup script not properly parsing the parameters passed to it by mpd.
Add DNS servers under System > General. If you do not know your DNS servers, use common public DNS servers like 18.104.22.168 / 22.214.171.124 or 126.96.36.199 / 188.8.131.52
Install the System Patches Package
Add a new patch and fetch/apply it:
Path Strip Count: 1
Ignore Whitespace: [X]