新装的redhat es 5 联网有问题，ping不通
x3550配成了192.168.1.250,255.255.255.0， 网关为空，笔记本是x201,一样的配置，ip末尾是240，用普通网线直连，ping不通，但3550可以ping通自己的IP以及127.0.0.1。另外还测试ping网关，用笔记本测试时可以通的，然后把网线拔下来插在服务器上，服务器ping不通网关。服务器有四块网卡，测试过程中只配了eth0. 这批服务器一样的有好几台，之前配置挺容易的，这台就是后来插了一块新的双口网卡，然后重装了操作系统。我对网络接触不多，请大家帮忙分析下原因，多谢！
ifconfig -a

[root@localhost ~]# ifconfig -a
eth0 Link encap:Ethernet HWaddr 90:E2:BA:0A:D2:CA  
  inet addr:192.168.1.250 Bcast:192.168.1.255 Mask:255.255.255.0
  UP BROADCAST MULTICAST MTU:1500 Metric:1
  RX packets:0 errors:0 dropped:0 overruns:0 frame:0
  TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
  collisions:0 txqueuelen:1000 
  RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
  Memory:97a80000-97b00000 

eth1 Link encap:Ethernet HWaddr 90:E2:BA:0A:D2:CB  
  UP BROADCAST MULTICAST MTU:1500 Metric:1
  RX packets:0 errors:0 dropped:0 overruns:0 frame:0
  TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
  collisions:0 txqueuelen:1000 
  RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
  Memory:97a00000-97a80000 

eth2 Link encap:Ethernet HWaddr 5C:F3:FC:E7:98:84  
  BROADCAST MULTICAST MTU:1500 Metric:1
  RX packets:0 errors:0 dropped:0 overruns:0 frame:0
  TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
  collisions:0 txqueuelen:1000 
  RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
  Interrupt:169 Memory:92000000-92012800 

eth3 Link encap:Ethernet HWaddr 5C:F3:FC:E7:98:86  
  BROADCAST MULTICAST MTU:1500 Metric:1
  RX packets:0 errors:0 dropped:0 overruns:0 frame:0
  TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
  collisions:0 txqueuelen:1000 
  RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
  Interrupt:210 Memory:94000000-94012800 

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:10036 errors:0 dropped:0 overruns:0 frame:0
  TX packets:10036 errors:0 dropped:0 overruns:0 carrier:0
  collisions:0 txqueuelen:0 
  RX bytes:10714232 (10.2 MiB) TX bytes:10714232 (10.2 MiB)

usb0 Link encap:Ethernet HWaddr 5E:F3:FC:DF:98:87  
  inet addr:169.254.95.120 Bcast:169.254.95.255 Mask:255.255.255.0
  UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
  RX packets:2004 errors:0 dropped:0 overruns:0 frame:0
  TX packets:1058 errors:0 dropped:0 overruns:0 carrier:0
  collisions:0 txqueuelen:1000 
  RX bytes:136470 (133.2 KiB) TX bytes:63249 (61.7 KiB)


------解决方案--------------------
如果网卡禁用的话也是自己的机子可以ping通，别的机子ping不不通ifup启用试试
------解决方案--------------------
eth0的ip都没有，怎么配置的？