Mountain Lion weird DNS issue

Hello,
having a weird issue with my DNS. i have a machine running mountain lion with osx server. Whenever i log into one of the laptops (also running mountain lion), and i try to ping the server, the machine resolves to the external IP of the server. if i flush dns, it resolves to the internal IP. If I logout or reboot, it goes back to pointing to the external IP. i've done no modifications to the /etc/hosts. this has me stumped. here is what it looks like (i changed the names and ips):
rmbp15:~ admin$ ping server
PING mydomain.com (70.70.70.70): 56 data bytes
Request timeout for icmp_seq 0
Request timeout for icmp_seq 1
^C
--- mydomain.com ping statistics ---
3 packets transmitted, 0 packets received, 100.0% packet loss
rmbp15:~ admin$ sudo killall -HUP mDNSResponder
Password:
rmbp15:~ admin$ ping server
PING server.mydomain.com (10.10.10.10): 56 data bytes
64 bytes from 10.10.10.10: icmp_seq=0 ttl=64 time=1.209 ms
64 bytes from 10.10.10.10: icmp_seq=1 ttl=64 time=1.237 ms
64 bytes from 10.10.10.10: icmp_seq=2 ttl=64 time=5.686 ms
^C
--- server.mydomain.com ping statistics ---
3 packets transmitted, 3 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 1.209/2.711/5.686/2.104 ms
This happens every time, so hosts cant connect to the server internally... Any help would be greatly appreciated.
thanks!

I'm not as familiar with OS X server as Windows server but it sounds like there might be a DNS record for your external IP in the DNS configuration... I would look for it in the Server Admin GUI and remove it if it exists.. then flush the DNS cache on the server.
I would also check the laptop's network configuration under ADVANCED... see what is in the DNS records for the connection you are using. Delete the external DNS record if there is one and make sure your internal DNS record is showing up there.

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