네트워크 문제 진단 (1) - ifconfig

네트워크 인터페이스가 살아있는지 진단

inet addr 값은 잘 되어있는지
서브넷 마스크는 잘 설정 되어있는지

$ ifconfig
eth0      Link encap:Ethernet  HWaddr 5E:4E:82:47:8C:89
          inet addr:10.110.236.172  Bcast:10.110.237.255  Mask:255.255.254.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:357463511 errors:0 dropped:0 overruns:0 frame:0
          TX packets:263762065 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:212563799148 (197.9 GiB)  TX bytes:103070430060 (95.9 GiB)
          Interrupt:24
 
lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:2256896 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2256896 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:3244991279 (3.0 GiB)  TX bytes:3244991279 (3.0 GiB)