To determine a DNS problem try "ping yahoo.com"
if that resolves then DNS is probably ok. IF it does not
try this "ping 220.127.116.11" which is the ip for yahoo.com if you
get a response from this and not the above, then DNS is the
NOTE: Do not use the quotes
To check your DNS settings "cat /etc/resolv.conf" for the
DNS server list.
To fix it enter the appropriate server address (from BellSouth website)
# In the DNS Server Search Order field, delete any existing addresses that may be in the field and add the following addresses specified for your state (entering the number into the spaces above the field and clicking Add): GA - 18.104.22.168, 22.214.171.124; FL - 126.96.36.199, 188.8.131.52; AL/KY/NC/SC – 184.108.40.206, 220.127.116.11; LA/MS/TN – 18.104.22.168, 22.214.171.124. For example, if you are in GA, first Add 126.96.36.199, then Add 188.8.131.52.
The format in /etc/resolv.conf would be
Its' interesting to think that your fiber is listed as no faster then
DSL according to Bell South.