but, i couldn't try it manually beacause i want to install the system with automatic netinstall finally,
so i must use interface=auto as boot parameter, let installer can't auto adapt the NIC which have plug a cable.
here is the relative log:
Dec 10 10:48:06 main-menu[358]: INFO: Menu item 'ethdetect' selected
Dec 10 10:48:06 kernel: [ 25.607101] r8169 Gigabit Ethernet driver 2.3LK-NAPI loaded
Dec 10 10:48:06 kernel: [ 25.607125] r8169 0000:02:00.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
Dec 10 10:48:06 kernel: [ 25.607167] r8169 0000:02:00.0: setting latency timer to 64
Dec 10 10:48:06 kernel: [ 25.607210] alloc irq_desc for 26 on node -1
Dec 10 10:48:06 kernel: [ 25.607212] alloc kstat_irqs on node -1
Dec 10 10:48:06 kernel: [ 25.607228] r8169 0000:02:00.0: irq 26 for MSI/MSI-X
Dec 10 10:48:06 kernel: [ 25.607831] eth0: RTL8168c/8111c at 0xffffc9000034e000, 00:21:85:01:ff:5c, XID 1c2000c0 IRQ 26
Dec 10 10:48:06 kernel: [ 25.615707] Intel(R) PRO/1000 Network Driver - version 7.3.21-k5-NAPI
Dec 10 10:48:06 kernel: [ 25.615710] Copyright (c) 1999-2006 Intel Corporation.
Dec 10 10:48:06 kernel: [ 25.615748] e1000 0000:03:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
Dec 10 10:48:06 net/hw-detect.hotplug: Detected hotpluggable network interface lo
Dec 10 10:48:06 net/hw-detect.hotplug: Detected hotpluggable network interface eth0
Dec 10 10:48:07 kernel: [ 25.867589] e1000: 0000:03:00.0: e1000_probe: (PCI:33MHz:32-bit) 00:07:e9:10:79:e1
Dec 10 10:48:07 kernel: [ 25.902177] e1000: eth1: e1000_probe: Intel(R) PRO/1000 Network Connection
Dec 10 10:48:07 kernel: [ 25.902208] e1000 0000:03:01.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
Dec 10 10:48:07 kernel: [ 26.154391] e1000: 0000:03:01.0: e1000_probe: (PCI:33MHz:32-bit) 00:07:e9:10:79:de
Dec 10 10:48:07 kernel: [ 26.193637] e1000: eth2: e1000_probe: Intel(R) PRO/1000 Network Connection
Dec 10 10:48:07 net/hw-detect.hotplug: Detected hotpluggable network interface eth2
Dec 10 10:48:07 net/hw-detect.hotplug: Detected hotpluggable network interface eth1
Dec 10 10:48:07 hw-detect: Loading PCMCIA bridge driver module: i82365
Dec 10 10:48:07 hw-detect: FATAL: Module i82365 not found.
Dec 10 10:48:08 check-missing-firmware: no missing firmware in /dev/.udev/firmware-missing
Dec 10 10:48:08 kernel: [ 27.596162] r8169: eth0: link down
Dec 10 10:48:08 kernel: [ 27.596495] ADDRCONF(NETDEV_UP): eth0: link is not ready
Dec 10 10:48:08 kernel: [ 27.626452] ADDRCONF(NETDEV_UP): eth1: link is not ready
Dec 10 10:48:08 kernel: [ 27.683856] ADDRCONF(NETDEV_UP): eth2: link is not ready
Dec 10 10:48:09 init: starting pid 339, tty '/dev/tty2': '-/bin/sh'
Dec 10 10:48:09 check-missing-firmware: no missing firmware in /dev/.udev/firmware-missing
Dec 10 10:48:10 main-menu[358]: INFO: Menu item 'netcfg' selected
Dec 10 10:48:10 netcfg[3916]: INFO: eth0 is disconnected. (MII)
Dec 10 10:48:10 netcfg[3916]: INFO: eth0 is not a wireless interface. Continuing.
Dec 10 10:48:10 kernel: [ 29.266430] r8169: eth0: link down
Dec 10 10:48:10 kernel: [ 29.266760] ADDRCONF(NETDEV_UP): eth0: link is not ready
Dec 10 10:48:10 netcfg[3916]: INFO: eth1 is disconnected. (MII)
Dec 10 10:48:10 netcfg[3916]: INFO: eth1 is not a wireless interface. Continuing.
Dec 10 10:48:10 kernel: [ 29.289684] ADDRCONF(NETDEV_UP): eth1: link is not ready
Dec 10 10:48:10 netcfg[3916]: INFO: eth2 is disconnected. (MII)
Dec 10 10:48:10 netcfg[3916]: INFO: eth2 is not a wireless interface. Continuing.
Dec 10 10:48:10 kernel: [ 29.347050] ADDRCONF(NETDEV_UP): eth2: link is not ready
Dec 10 10:48:10 kernel: [ 29.437364] r8169: eth0: link down
Dec 10 10:48:10 kernel: [ 29.437695] ADDRCONF(NETDEV_UP): eth0: link is not ready
Dec 10 10:48:45 kernel: [ 63.884359] lo: Disabled Privacy Extensions
Dec 10 10:48:45 kernel: [ 63.889074] r8169: eth0: link down
Dec 10 10:48:45 kernel: [ 63.889397] ADDRCONF(NETDEV_UP): eth0: link is not ready
Dec 10 10:48:45 netcfg[3916]: INFO: executing: ip addr add
172.16.0.96/24 broadcast 172.16.0.255 dev eth0
Dec 10 10:49:14 netcfg[3916]: INFO: eth0 is disconnected. (MII)
Dec 10 10:49:14 netcfg[3916]: INFO: eth0 is not a wireless interface. Continuing.
Dec 10 10:49:14 netcfg[3916]: INFO: eth1 is disconnected. (MII)
Dec 10 10:49:14 netcfg[3916]: INFO: eth1 is not a wireless interface. Continuing.
Dec 10 10:49:14 kernel: [ 93.801715] ADDRCONF(NETDEV_UP): eth1: link is not ready
Dec 10 10:49:14 kernel: [ 93.804385] e1000: eth1 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
Dec 10 10:49:15 netcfg[3916]: INFO: eth2 is disconnected. (MII)
Dec 10 10:49:15 netcfg[3916]: INFO: eth2 is not a wireless interface. Continuing.
Dec 10 10:49:15 kernel: [ 93.867068] ADDRCONF(NETDEV_UP): eth2: link is not ready
Dec 10 10:49:15 main-menu[358]: (process:3915): udhcpc (v1.17.1) started
Dec 10 10:49:15 main-menu[358]: (process:3915): Sending discover...
Dec 10 10:49:15 main-menu[358]: (process:3915): Sending discover...
Dec 10 10:49:15 main-menu[358]: (process:3915): Sending discover...
Dec 10 10:49:15 main-menu[358]: (process:3915): udhcpc: has been called with an unknown param: leasefail
Dec 10 10:49:15 main-menu[358]: (process:3915): Received SIGTERM
Dec 10 10:49:15 main-menu[358]: INFO: Menu item 'netcfg' succeeded but requested to be left unconfigured.
Dec 10 10:49:18 main-menu[358]: INFO: Menu item 'partman-base' selected
Dec 10 10:49:18 net/hw-detect.hotplug: Detected hotpluggable network interface eth0
Dec 10 10:49:18 net/hw-detect.hotplug: Detected hotpluggable network interface eth1
Dec 10 10:49:18 net/hw-detect.hotplug: Detected hotpluggable network interface lo
Dec 10 10:49:18 net/hw-detect.hotplug: Detected hotpluggable network interface eth2
Dec 10 10:49:18 hw-detect: Loading PCMCIA bridge driver module: i82365
Dec 10 10:49:18 hw-detect: FATAL: Module i82365 not found
BTW i have read the netcfg source:netcfg.c netcfg-common.c, i can't find where the program deal with interface=auto?