I can no longer resolve DNS from my Fedora core 4 install. Things have been working fine for months then just quit. I can NOT ping via domain name but can ping via IP. /etc/resolv.conf is populated with the same DNS servers other machines in the network are using and the interface seems to otherwise work (can ssh to box, etc.)I checked though the few things I could think of and am looking for some guidance.

Example:
# ping google.com
ping: unknown host google.com

# ping 72.14.207.99
PING 72.14.207.99 (72.14.207.99) 56(84) bytes of data.
64 bytes from 72.14.207.99: icmp_seq=0 ttl=237 time=65.3 ms
64 bytes from 72.14.207.99: icmp_seq=1 ttl=237 time=62.9 ms
64 bytes from 72.14.207.99: icmp_seq=2 ttl=237 time=64.9 ms

--- 72.14.207.99 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2015ms
rtt min/avg/max/mdev = 62.937/64.415/65.352/1.097 ms, pipe 2

# cat /etc/resolv.conf
search hsd1.tx.comcast.net.
nameserver 205.166.226.38
nameserver 64.63.77.89
nameserver 68.87.85.98

Ideas?

Thanks in advance, DQ

I found port 53 open on 205.166.226.38
Probably it's an acl issue in the DNS configuration. Contact your ISP. Meantime check with these DNS servers ->

Verizon (Level3) Nameservers
4.2.2.1
4.2.2.2
4.2.2.3
4.2.2.4
4.2.2.5
4.2.2.6