Networking set up on workstation not quite right, yet

I've installed a fresh copy of RHEL Workstation (moved over from FC, glad I did).  I'm experiencing some network domain issues.  I can get to the network (local and outside), but my domain name stuff is not quite right.

Details:

• IP address is set/retrieved via DHCP
• ifconfig returns:

$ ifconfig
eth0      Link encap:Ethernet  HWaddr 00:13:72:2F:1B:3D 
          inet addr:192.168.43.105  Bcast:192.168.43.255  Mask:255.255.255.0

• contents of /etc/resolve.conf:

# Generated by NetworkManager
domain office.mydomain.com
search office.mydomain.com
nameserver 192.168.43.61

• contents of /etc/hosts:

127.0.0.1   localhost rhineheart.office.mydomain.com rhineheart
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

• domainname, hostname, hostname -i, hostname -f output:

[me@rhineheart ~]$ domainname
(none)
[me@rhineheart ~]$ hostname
rhineheart.office.mydomain.com
[me@rhineheart ~]$ hostname -i
127.0.0.1
[me@rhineheart ~]$ hostname -f
localhost

• Contents of /etc/sysconfig/network:

NETWORKING=yes
HOSTNAME=rhineheart.office.mydomain.com
 

• nslookup rhineheart:

Server:        192.168.43.61
Address:    192.168.43.61#53

** server can't find rhineheart: SERVFAIL
 

• /etc/nsswitch.conf:

hosts:      dns files

ethers:     files
netmasks:   files
networks:   files
 

Our main domain (mydomain.com) is hosted on another network.  The domain 'office.mydomain.com' is our local office.

Hmmm. Ideas?