我的网络接口（eth0）很少总是有：
$ ifconfig eth0
eth0 Link encap:Ethernet HWaddr aa:00:04:00:0a:04
inet addr:10.100.1.198 Bcast:10.100.1.255 Mask:255.255.255.0
inet6 addr: fe80::a800:4ff:fe00:a04/64 Scope:Link
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:300017 errors:0 dropped:0 overruns:0 frame:0
TX packets:125399 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:131522946 (125.4 MiB) TX bytes:13330040 (12.7 MiB)
Interrupt:43 Base address:0x8000
和
$ route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 eth0
当我连接到有 DHCP 服务器的网络时，一切正常，它给我 10.100.1.198 地址，我可以访问网络，但是当我想查看我的 IP 地址时，总是返回：192.168.1.1
怎么了？
更新：我使用 debian wheezy 并且我有这个：
$ tree -L 2 /etc/network
/etc/network
├── if-down.d
│ ├── avahi-autoipd
│ ├── bind9
│ ├── openvpn
│ ├── sendmail
│ └── wpasupplicant -> ../../wpa_supplicant/ifupdown.sh
├── if-post-down.d
│ ├── avahi-daemon -> ../if-up.d/avahi-daemon
│ ├── bridge -> /lib/bridge-utils/ifupdown.sh
│ ├── sendmail
│ ├── vde2
│ ├── vlan
│ ├── wireless-tools
│ └── wpasupplicant -> ../../wpa_supplicant/ifupdown.sh
├── if-pre-up.d
│ ├── bridge -> /lib/bridge-utils/ifupdown.sh
│ ├── ethtool
│ ├── vde2
│ ├── vlan
│ ├── wireless-tools
│ └── wpasupplicant -> ../../wpa_supplicant/ifupdown.sh
├── if-up.d
│ ├── avahi-autoipd
│ ├── avahi-daemon
│ ├── bind9
│ ├── ethtool
│ ├── ip
│ ├── mountnfs
│ ├── openssh-server
│ ├── openvpn
│ ├── sendmail
│ └── wpasupplicant -> ../../wpa_supplicant/ifupdown.sh
├── interfaces
└── run -> /run/network
5 directories, 29 files