ifconfig解析

$ ifconfig
eth0      Link encap:Ethernet  HWaddr 00:0C:29:C2:8D:7E
          inet addr:192.168.10.223  Bcast:192.168.10.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:10 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          RX bytes:0 (0.0 b)  TX bytes:420 (420.0 b)
          Interrupt:10 Base address:0x10a0

eth1      Link encap:Ethernet  HWaddr 00:0C:29:C2:8D:88
          inet addr:192.168.56.136  Bcast:192.168.56.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:603 errors:0 dropped:0 overruns:0 frame:0
          TX packets:110 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          RX bytes:55551 (54.2 Kb)  TX bytes:7601 (7.4 Kb)
          Interrupt:9 Base address:0x10c0

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:37 errors:0 dropped:0 overruns:0 frame:0
          TX packets:37 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:3020 (2.9 Kb)  TX bytes:3020 (2.9 Kb)
$ route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.10.0    *               255.255.255.0   U     0      0        0 eth0
192.168.56.0    *               255.255.255.0   U     0      0        0 eth1
127.0.0.0       *               255.0.0.0       U     0      0        0 lo
default         192.168.10.1    0.0.0.0         UG    0      0        0 eth0
两个网络接口，一个网络接口连到192.168.10.0/24网络，另一个网络接口连到192.168.56.0/24网络
路由表的Destination是目的网络地址，Genmask是子网掩码，Gateway是下一跳地址，Iface是发送接口，Flags中的U标志表示此条目有效（可以禁用某些条目），G标志表示此条目的下一跳地址是某个路由器的地址，没有G标志的条目表示目的网络地址是与本机接口直接相连的网络，不必经路由器转发，因此下一跳地址处记为*号。