I am also seeing trouble with the new ifupdown. None of my interfaces are working now -- I had to get the network running by manually configuring it. Here's a typical trace of the errors, and I've attached my interfaces file.
Apr 5 17:18:29 kleph ifplugd(eth0)[23315]: Executing '/etc/ifplugd/ifplugd.action eth0 down'. Apr 5 17:18:30 kleph ifplugd(eth0)[23315]: client: /sbin/ifdown: interface eth0 not configured Apr 5 17:18:30 kleph ifplugd(eth0)[23315]: Program executed successfully. Apr 5 17:18:30 kleph ifplugd(eth0)[23315]: Exiting. Apr 5 17:19:22 kleph ifplugd(eth0)[24104]: ifplugd 0.26 initializing, using NETLINK device monitoring. Apr 5 17:19:22 kleph ifplugd(eth0)[24104]: Using interface eth0/00:0D:60:2E:4D:9D with driver <e1000> (version: 5.6.10.1-k2-NAPI) Apr 5 17:19:22 kleph ifplugd(eth0)[24104]: Using detection mode: SIOCETHTOOL Apr 5 17:19:22 kleph ifplugd(eth0)[24104]: Initialization complete, link beat detected, interface enabled. Apr 5 17:19:22 kleph ifplugd(eth0)[24104]: Executing '/etc/ifplugd/ifplugd.action eth0 up'. Apr 5 17:19:26 kleph ifplugd(eth0)[24104]: client: SIOCSIFADDR: No such device Apr 5 17:19:26 kleph ifplugd(eth0)[24104]: client: wired-home: ERROR while getting interface flags: No such device Apr 5 17:19:26 kleph ifplugd(eth0)[24104]: client: SIOCSIFNETMASK: No such device Apr 5 17:19:26 kleph ifplugd(eth0)[24104]: client: SIOCSIFBRDADDR: No such device Apr 5 17:19:26 kleph ifplugd(eth0)[24104]: client: wired-home: ERROR while getting interface flags: No such device Apr 5 17:19:26 kleph ifplugd(eth0)[24104]: client: wired-home: ERROR while getting interface flags: No such device Apr 5 17:19:26 kleph ifplugd(eth0)[24104]: client: Failed to bring up wired-home. Apr 5 17:19:26 kleph ifplugd(eth0)[24104]: Program executed successfully. Apr 5 17:19:57 kleph ifplugd(eth0)[24104]: Executing '/etc/ifplugd/ifplugd.action eth0 down'. Apr 5 17:19:57 kleph ifplugd(eth0)[24104]: client: /sbin/ifdown: interface eth0 not configured Apr 5 17:19:57 kleph ifplugd(eth0)[24104]: Program executed successfully. Apr 5 17:19:57 kleph ifplugd(eth0)[24104]: Exiting.
# /etc/network/interfaces -- configuration file for ifup(8), ifdown(8) # The loopback interface auto lo iface lo inet loopback mapping hotplug script /usr/local/sbin/map-exclude map eth0 map ath0 mapping ifplugd script /bin/echo mapping eth* script /usr/local/sbin/map-mac-address map 00:0d:60:2e:4d:9d wired map 00:05:4e:45:3c:f0 wireless mapping ath* script /usr/local/sbin/map-mac-address map 00:0d:60:2e:4d:9d wired map 00:05:4e:45:3c:f0 wireless mapping wired script /usr/local/sbin/map-scheme map home wired-home map work wired-work map none wired-default mapping wireless script /usr/local/sbin/map-scheme map home wireless-home map work wireless-work map none wireless-default iface wired-home inet static address 192.168.1.9 netmask 255.255.255.0 gateway 192.168.1.254 broadcast 192.168.1.255 network 192.168.1.0 dns_search csail.mit.edu ai.mit.edu mit.edu dns_nameservers 204.127.202.19 216.148.227.79 24.147.1.62 iface wired-work inet static address 128.30.16.24 netmask 255.255.255.0 gateway 128.30.16.1 broadcast 128.30.16.255 network 128.30.16.0 dns_search csail.mit.edu ai.mit.edu mit.edu dns_nameservers 128.30.2.23 128.30.2.24 128.30.2.25 128.30.0.125 iface wired-default inet dhcp dns_search csail.mit.edu ai.mit.edu mit.edu name Unknown interface type iface wireless-home inet static wireless_essid cph-home-g address 192.168.1.10 netmask 255.255.255.0 gateway 192.168.1.254 broadcast 192.168.1.255 network 192.168.1.0 metric 1 dns_search csail.mit.edu ai.mit.edu mit.edu dns_nameservers 204.127.202.19 216.148.227.79 24.147.1.62 iface wireless-work inet static wireless_essid StataCenter address 128.30.4.107 netmask 255.255.254.0 gateway 128.30.4.1 broadcast 128.30.5.255 network 128.30.4.0 metric 1 dns_search csail.mit.edu ai.mit.edu mit.edu dns_nameservers 128.30.2.23 128.30.2.24 128.30.2.25 128.30.0.125 iface wireless-default inet dhcp metric 1 dns_search csail.mit.edu ai.mit.edu mit.edu iface usb0 inet static address 192.168.129.1 pointopoint 192.168.129.201 netmask 255.255.255.255 broadcast 192.168.129.1 network 192.168.129.1 iface usb1 inet static address 192.168.129.2 pointopoint 192.168.129.202 netmask 255.255.255.255 broadcast 192.168.129.2 network 192.168.129.2