# Mac networking problem

I’ve been having problems in the last week or two with my iMac losing its network connection. It’s the built-in Ethernet connection, which I have manually configured to give me a consistent IP number within the local network. I don’t know how to restart the connection, so I’ve rebooted the machine the 3-4 times it’s happened. (In Linux, I’d run the networking rc script and probably save myself a reboot.)

The /var/log/system.log file is littered with lines that look like this:

Apr 23 03:16:48 malMini configd[38]: bootp_session_transmit:
bpf_write(en4) failed: No buffer space available (55)
Apr 23 03:16:48 malMini configd[38]: DHCP en4: INIT transmit failed


The DHCP part puzzled me for a bit, because I’m not using DHCP, but I soon realized that my main Ethernet connection--what I think of as the Ethernet connection--is en0, not en4. The en4 connection is some sort of fake connection created by Parallels.

A Google search on some of the phrases in that message led me to this page, which suggests that the problem is some sort of Bluetooth/network interface added by Apple to the 10.4.9 update. I turned off that interface--it’s called “Bluetooth PAN”--this morning, using the Network pane of System Preferences. It’s too early to tell if that change will fix the problem, but I’ll keep an eye on it.

Update 5/7/07 No network drops in the two weeks since I turned off the Bluetooth PAN interface.

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