Bluetooth PAN Kills Network Connection

My iMac lost its network connection this morning. The system.log was full of these:

May 11 10:54:11 iMac configd[48]: bootp_session_transmit: bpf_write(en2) failed: No buffer space available (55)
May 11 10:54:11 iMac configd[48]: DHCP en2: INIT transmit failed

which is odd, because the iMac only has two ethernet interfaces: en0 (wired) and en1 (wireless), so what is en2?

It seems that 10.4.9 introduced something called ‘Bluetooth PAN‘ and when I paired up my new Nokia 6300, OS X enabled this. Unfortunately, it is this which causes the DHCP issue shown in system.log.

The solution (thanks to Jonas Salling’s comment on Justin Williams’ Blog) is to disable Bluetooth PAN in system preferences.

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