resolv.conf, NetworkManager, no ping response on one nameserver

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resolv.conf, NetworkManager, no ping response on one nameserver


byers@f12 ~]$ uname -r
2.6.32.11-99.fc12.i686.PAE
this is a wired box, no wless
router at 192.168.2.1,
eth0 presently using static ip 192.168.2.8,
but that is recent change from previous dhcp 192.168.2.100

I don't think that change is causing my ping symptoms:


byers@f12 ~]$ cat /etc/resolv.conf
# Generated by NetworkManager
search pacbell.net
nameserver 206.13.20.12
nameserver 206.13.31.12
nameserver 68.94.156.1

the first one fails to respond to ping
while the next two respond to ping ok:


[byers@f12 ~]$ ping -c 5 206.13.20.12
PING 206.13.20.12 (206.13.20.12) 56(84) bytes of data.

--- 206.13.20.12 ping statistics ---
5 packets transmitted, 0 received, 100% packet loss, time 14000ms


[byers@f12 ~]$ ping -c 5 206.13.31.12
PING 206.13.31.12 (206.13.31.12) 56(84) bytes of data.
64 bytes from 206.13.31.12: icmp_seq=1 ttl=249 time=47.4 ms
64 bytes from 206.13.31.12: icmp_seq=2 ttl=249 time=48.2 ms
64 bytes from 206.13.31.12: icmp_seq=3 ttl=249 time=46.1 ms
64 bytes from 206.13.31.12: icmp_seq=4 ttl=249 time=46.9 ms
64 bytes from 206.13.31.12: icmp_seq=5 ttl=249 time=47.2 ms

--- 206.13.31.12 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4051ms
rtt min/avg/max/mdev = 46.114/47.217/48.293/0.725 ms


[byers@f12 ~]$ ping -c 5 68.94.156.1
PING 68.94.156.1 (68.94.156.1) 56(84) bytes of data.
64 bytes from 68.94.156.1: icmp_seq=1 ttl=253 time=44.7 ms
64 bytes from 68.94.156.1: icmp_seq=2 ttl=253 time=44.0 ms
64 bytes from 68.94.156.1: icmp_seq=3 ttl=253 time=44.1 ms
64 bytes from 68.94.156.1: icmp_seq=4 ttl=253 time=45.0 ms
64 bytes from 68.94.156.1: icmp_seq=5 ttl=253 time=44.8 ms

--- 68.94.156.1 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4049ms
rtt min/avg/max/mdev = 44.065/44.553/45.014/0.470 ms

Summary:
I see zero response from ping 206.13.20.12,
while ping 206.13.31.12 , 68.94.156.1   both look ok

Is this normal?
I have been using these same IP for nameservers for years,
most recently in F10,F11 and now F12.
Why would NM supply a nameserver that is unresponive to ping?

pinging 206.13.29.12  and 206.13.30.12   also look ok,
but neither of these are in the NM resolv.conf

Am I free to get rid of the one failing ping, 206.13.20.12
and substitute one of 206.13.29.12 or 206.13.30.12?

thanks for any advice
Jack
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