I had the same issue on my local network (DHCP server could not update DNS) so I cobbled up a shell script that runs periodically to update DNS manually. It does a ping-sweep using "nmap -sP 192.168.1.0/24" and parses the output. The output (obfuscated and abbreviated) looks like this: > Starting Nmap 4.11 ( http://www.insecure.org/nmap/ ) at 2010-07-16 20:53 CDT > Host 192.168.1.1 appears to be up. > MAC Address: **:**:**:**:**:** (Unknown) > Host 192.168.1.2 appears to be up. > MAC Address: **:**:**:**:**:** (Compaq Computer) > Host workstation.local (192.168.1.5) appears to be up. > MAC Address: **:**:**:**:**:** (Hewlett Packard) > Host printer.local (192.168.1.9) appears to be up. In my case, I added the MAC address/DNS name pairs in /etc/ethers and use that to drive the process. I've even got a few VMware hosts with bridged interfaces, they work the same as the physical machines. Admittedly, it's a heck of a kludge. -- Jay Leafey - jay.leafey at mindless.com Memphis, TN -------------- next part -------------- A non-text attachment was scrubbed... Name: smime.p7s Type: application/x-pkcs7-signature Size: 3274 bytes Desc: S/MIME Cryptographic Signature URL: <http://lists.centos.org/pipermail/centos/attachments/20100716/349fa677/attachment-0005.bin>