Wrong hostname from DHCP

Hi,
I've been following a strange issue between Macs and Windows Server based DHCP for some time.
Mac's got their IP address via DHCP, just like Windows machines.
The compter name is set up in Sharing in System Preferences. Everything seems to be normal.
Now the fun starts:
When I open a Terminal window I see a completely different name on the command prompt. This probably causes Apple Remote Desktop not to see some clients when they are on, because they have wrong hostname. ARD complains the Mac are offline when I can walk to the Mac and plainly see it's switched on and connected to the network.
So, my theory is, the IP Mac get's was previously assigned to an laptop computer, which goes off the network and the DHCP-supplied IP address is released and next get's assigned to a Mac. Somehow the hostname used by the previous IP lease holder sticks to the IP address and get's slapped to the Mac. Strangely this hostname overrides the name assigned on System Preferences.
Has anyone else observed similar behavior?

Here's some of my journal:
Nov 01 12:01:41 localhost kernel: e1000e 0000:00:19.0: irq 40 for MSI/MSI-X
Nov 01 12:01:41 localhost kernel: e1000e 0000:00:19.0: irq 40 for MSI/MSI-X
Nov 01 12:01:41 localhost kernel: IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
Nov 01 12:01:43 localhost kernel: e1000e: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: R
Nov 01 12:01:43 localhost kernel: IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
Nov 01 12:01:43 localhost dhcpcd[243]: version 5.6.2 starting
Nov 01 12:01:43 localhost dhcpcd[243]: eth0: sending IPv6 Router Solicitation
Nov 01 12:01:43 localhost dhcpcd[243]: eth0: sendmsg: Cannot assign requested address
Nov 01 12:01:43 localhost dhcpcd[243]: eth0: broadcasting for a lease
....[non relevant services]...
Nov 01 12:01:46 localhost dhcpcd[243]: eth0: offered 192.168.10.120 from 192.168.10.1
Nov 01 12:01:46 localhost dhcpcd[243]: eth0: acknowledged 192.168.10.120 from 192.168.10.1
Nov 01 12:01:46 localhost dhcpcd[243]: eth0: checking for 192.168.10.120
Nov 01 12:01:47 localhost dhcpcd[243]: eth0: sending IPv6 Router Solicitation
Nov 01 12:01:50 localhost dhcpcd[243]: eth0: leased 192.168.10.120 for 14400 seconds
Nov 01 12:01:50 IC-1 dhcpcd[243]: forked to background, child pid 275
Nov 01 12:01:50 localhost netcfg-daemon[154]: :: ethernet-dhcp up [done]
Nov 01 12:01:50 localhost systemd[1]: Started Netcfg multi-profile daemon.
Nov 01 12:01:50 localhost systemd[1]: Starting Network.
Nov 01 12:01:50 localhost systemd[1]: Reached target Network.
See 5 lines from the bottom, the hostname briefly changes, then immediately changes back. IC-1 is the dns name assigned by dnsmasq.
I'm using netcfg.service. dhcpcd@ is disabled. I don't have ifplugd installed. There's no net-auto-wired service enabled.
I'm not sure what is calling dhcpcd in this log.
Maybe this should be in a different subforum...
Last edited by tladuke (2012-11-01 19:18:04)

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