I have the same problem. This is a Thinkpad R60 with Intel Core 2 Duo running Debian/amd64.
~# uname -a Linux melech 2.6.20-melech #1 SMP Mon Feb 19 11:33:33 CET 2007 x86_64 GNU/Linux ~# ifup -v eth0 Running mapping script guessnet-ifupdown on eth0 guessnet: 1 candidate profiles guessnet: Starting peer test subsystem guessnet: Sending 10 ARP probes, 1 every second... Caught unexpected exception, 15 stack frames unwound: guessnet-ifupdown [0x43a583] /usr/lib/libstdc++.so.6 [0x2b5cff1ef5e6] /usr/lib/libstdc++.so.6 [0x2b5cff1ef603] /usr/lib/libstdc++.so.6(__gxx_personality_v0+0x472) [0x2b5cff1ef562] /lib/libgcc_s.so.1 [0x2b5cff4be392] /lib/libgcc_s.so.1(_Unwind_ForcedUnwind+0xac) [0x2b5cff4be65c] /lib/libpthread.so.0(__pthread_unwind+0x40) [0x2b5cfef0abe0] /lib/libpthread.so.0 [0x2b5cfef052ab] /lib/libpthread.so.0 [0x2b5cfef0c410] /lib/libpthread.so.0(recvfrom+0x70) [0x2b5cfef0b640] /usr/lib/libpcap.so.0.7(pcap_read+0x81) [0x2b5cff01a071] /usr/lib/libpcap.so.0.7(pcap_next+0x1c) [0x2b5cff01b70c] guessnet-ifupdown [0x42513f] /lib/libpthread.so.0 [0x2b5cfef05f1a] /lib/libc.so.6(__clone+0x72) [0x2b5cff68c602] terminate called without an active exception Ignoring unknown interface eth0=eth0.
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