Repeated "Network transition occurred." message logged in DirectoryService.server.log

[XFox]

I already posted a reply regarding this problem in the “DirectoryService.server.log” topic but this is a more complete description of the situation.
I’m experiencing the issue on Mac OS X Server 10.4.8 configured as Open Directory Master and acting as the gateway of the network.
My DirectoryService.server.log looks like:

2006-09-29 19:23:48 CEST - Network transition occurred.
2006-09-29 19:24:18 CEST - Network transition occurred.
2006-09-29 19:24:48 CEST - Network transition occurred.
2006-09-29 19:25:18 CEST - Network transition occurred.
2006-09-29 19:25:48 CEST - Network transition occurred.

As you see, the message is printed every 30 seconds.

I don’t know if it’s related but the server is also the DNS server for itself and its FQDN resolves to both the IPs of the internal and
external interface:

% hostname
myserver.mycompany.lan
% host myserver
myserver.mycompany.lan has address 192.168.x.x
myserver.mycompany.lan has address 81.x.x.x

We have a public static IP but no company domain name assigned, so I did this with Server Admin’s DNS control panel to keep changeip happy and maintain the DNS server IP address on the internal subnetwork.

Moreover, I got these errors in system.log:

Sep 29 18:04:46 myserver DirectoryService[1844]: Search connection
failure: During an attempt to bind to [127.0.0.1] LDAP server.
Sep 29 18:04:46 myserver DirectoryService[1844]: Search connection
failure: Disabled future attempts to bind to [127.0.0.1] LDAP
server for next 0 seconds.

Sometimes, the server seems to hang (spinning beach ball of death and no more ssh logins) but continues to route network traffic and recovers by itself within some hours. I didn’t find any related log entry when it happens.
Any thoughts and/or possible explanations?

[XFox]

For any who will find this thread by searching the Internet, the cause of the network transition messages is the router configured in half-bridge mode.
Refers to this thread for all the details.
And yes, I should have searched the forum before posting… 😳

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