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在Linux中安裝兩塊網卡網路不通的解決方法

←手機掃碼閱讀     火星人 @ 2014-03-09 , reply:0

  案例一
  一天,小王突然急匆匆的來找我,他說:「我在機子上剛裝的redhat怎麼老也ping不通伺服器,我網卡的驅動都安裝了,ping 自己的兩塊網卡的IP都能通,可就時訪問不了伺服器.我輸入http://172.31.0.101就提示『當試圖與172.31.0.101聯繫時,連接被拒絕』」
  
  我來到小王的機器前查看了一下網路配置.
  
  [root@rhas root]# ifconfig -a
  eth0 Link encap:Ethernet HWaddr 00:D0:B7:C6:8F:1D
  inet addr:172.31.0.200 Bcast:172.31.0.255 Mask:255.255.255.0
  UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
  RX packets:16 errors:0 dropped:0 overruns:0 frame:0
  TX packets:5 errors:0 dropped:0 overruns:0 carrier:0
  collisions:0 txqueuelen:1000
  RX bytes:1306 (1.2 Kb) TX bytes:210 (210.0 b)
  Interrupt:10 Base address:0xe800 Memory:d9100000-d9100038
  
  eth1 Link encap:Ethernet HWaddr 00:01:03:40:A4:15
  inet addr:172.31.0.201 Bcast:172.31.0.255 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:32 errors:0 dropped:0 overruns:0 carrier:32
  collisions:0 txqueuelen:1000
  RX bytes:0 (0.0 b) TX bytes:1920 (1.8 Kb)
  Interrupt:11 Base address:0xec00
  
  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:1430 errors:0 dropped:0 overruns:0 frame:0
  TX packets:1430 errors:0 dropped:0 overruns:0 carrier:0
  collisions:0 txqueuelen:0
  RX bytes:143776 (140.4 Kb) TX bytes:143776 (140.4 Kb)
  
  [root@rhas root]# route -n
  Kernel IP routing table
  Destination Gateway Genmask Flags Metric Ref Use Iface
  172.31.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
  172.31.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
  169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth1
  127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
  0.0.0.0 172.31.0.254 0.0.0.0 UG 0 0 0 eth1
  
  到這一步我猜想網線可能沒有插到默認網關對應的網卡上即eth1(嗨!小王的機器被鑲在桌子里不太好挪動.連他自己把網線插在那塊卡上都不知道了.)
  
  接著我在一機子上ping 172.31.0.200和172.31.0.201,在小王的機器監聽
  [root@rhas root]# tcpdump
  tcpdump: listening on eth0
  19:32:29.109283 172.31.0.101 > 172.31.0.200: icmp: echo request (DF)
  19:32:30.109337 172.31.0.101 > 172.31.0.200: icmp: echo request (DF)
  19:32:31.109418 172.31.0.101 > 172.31.0.200: icmp: echo request (DF)
  19:32:42.670162 172.31.0.101 > 172.31.0.201: icmp: echo request (DF)
  19:32:43.670218 172.31.0.101 > 172.31.0.201: icmp: echo request (DF)
  19:32:44.670291 172.31.0.101 > 172.31.0.201: icmp: echo request (DF)


  ........................
  ........................
  19:32:56.671040 172.31.0.101 > 172.31.0.201: icmp: echo request (DF)
  19:32:57.671064 172.31.0.101 > 172.31.0.201: icmp: echo request (DF)
  19:32:58.671133 172.31.0.101 > 172.31.0.201: icmp: echo request (DF)
  19:32:59.671187 172.31.0.101 > 172.31.0.201: icmp: echo request (DF)
  19:33:00.671257 172.31.0.101 > 172.31.0.201: icmp: echo request (DF)
  19:33:01.671349 172.31.0.101 > 172.31.0.201: icmp: echo request (DF)
  19:33:02.671377 172.31.0.101 > 172.31.0.201: icmp: echo request (DF)
  19:33:03.671441 172.31.0.101 > 172.31.0.201: icmp: echo request (DF)
  
  36 packets received by filter
  0 packets dropped by kernel
  
  沒有回應,看一下Firewall的設置.
  [root@rhas3 123]# iptables -L -n
  Chain INPUT (policy ACCEPT)
  target prot opt source destination
  
  Chain FORWARD (policy ACCEPT)
  target prot opt source destination
  
  Chain OUTPUT (policy ACCEPT)
  target prot opt source destination
  
  又不是防火牆的問題,想了一下,我越發肯定剛才的想法是正確的.
  
  [root@rhas root]# cat /etc/modules.conf
  alias eth0 e100
  alias eth1 3c59x
  alias sound-slot-0 via82cxxx_audio
  post-install sound-slot-0 /bin/aumix-minimal -f /etc/.aumixrc -L >/dev/null 2>&1 || :
  pre-remove sound-slot-0 /bin/aumix-minimal -f /etc/.aumixrc -S >/dev/null 2>&1 || :
  alias usb-controller usb-uhci
  
  [root@rhas root]#mii-tool
  eth0: negotiated 100baseTx-Fd flow-control, link ok
  eth1: no linkk
  
  
  找到原因了,果然是插反了.既然不方便換埠最簡單的就把eth1即3Com網卡宕調就OK了
  當然也可以把兩塊網卡分配在不同的網段.
  [root@rhas root]# vi /etc/sysconfig/network-scripts/ifcfg-eth1
  # 3Com Corporation|3c905C-TX/TX-M [Tornado]
  DEVICE=eth1
  BOOTPROTO=static
  BROADCAST=172.31.0.255
  HWADDR=00:01:03:40:A4:15
  IPADDR=172.31.0.201
  NETMASK=255.255.255.0
  NETWORK=172.31.0.0
  ONBOOT=no
  TYPE=Ethernet~
  ~
  ~
  "/etc/sysconfig/network-scripts/ifcfg-eth1" [已轉換] 10L, 207C 9,1 全部
  或者在啟動哦時根本不要載入3Com網卡的驅動哦.
  從啟動我們的網路
  [root@rhas root]# service network restart
  正在關閉介面 eth0: [ 確定 ]
  關閉環回介面: [ 確定 ]
  設置網路參數: [ 確定 ]
  彈出環回介面: [ 確定 ]
  彈出界面 eth0:
  
  [ 確定 ]
  [root@rhas root]#
  [root@rhas root]#
  [root@rhas root]#
  [root@rhas root]# ifconfig


  eth0 Link encap:Ethernet HWaddr 00:D0:B7:C6:8F:1D
  inet addr:172.31.0.200 Bcast:172.31.0.255 Mask:255.255.255.0
  UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
  RX packets:68 errors:0 dropped:0 overruns:0 frame:0
  TX packets:10 errors:0 dropped:0 overruns:0 carrier:0
  collisions:0 txqueuelen:1000
  RX bytes:5560 (5.4 Kb) TX bytes:504 (504.0 b)
  Interrupt:10 Base address:0xe800 Memory:d9100000-d9100038
  
  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:2041 errors:0 dropped:0 overruns:0 frame:0
  TX packets:2041 errors:0 dropped:0 overruns:0 carrier:0
  collisions:0 txqueuelen:0
  RX bytes:209184 (204.2 Kb) TX bytes:209184 (204.2 Kb)
  
  [root@rhas root]# ping 172.31.0.101
  PING 172.31.0.101 (172.31.0.101) 56(84) bytes of data.
  64 bytes from 172.31.0.101: icmp_seq=0 ttl=64 time=0.542 ms
  64 bytes from 172.31.0.101: icmp_seq=1 ttl=64 time=0.270 ms
  
  --- 172.31.0.101 ping statistics ---
  2 packets transmitted, 2 received, 0% packet loss, time 1004ms
  rtt min/avg/max/mdev = 0.270/0.406/0.542/0.136 ms, pipe 2
  [root@rhas root]# route -n
  Kernel IP routing table
  Destination Gateway Genmask Flags Metric Ref Use Iface
  172.31.0.0 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 0 0 0 eth0
  127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
  0.0.0.0 172.31.0.254 0.0.0.0 UG 0 0 0 eth0
  [root@rhas root]#
  
  
  此時訪問網路沒有問題,故障排除.
  
  案例二
  由此我又想相類似的案例,一win98用戶錯將」TCP/IP撥號適配器」設置了IP,結果造成他ping不通其他機器.
  e.g.將撥號適配器設置ip=172.31.0.1
  
  C:>ipconfig/all
  Windows 98 IP Configuration
  
  Host Name . . . . . . . . . : R4U2L8
  DNS Servers . . . . . . . . :
  Node Type . . . . . . . . . : Broadcast
  NetBIOS Scope ID. . . . . . :
  IP Routing Enabled. . . . . : No
  WINS Proxy Enabled. . . . . : No
  NetBIOS Resolution Uses DNS : No
  
  0 Ethernet adapter :
  
  Description . . . . . . . . : PPP Adapter.
  Physical Address. . . . . . : 44-45-53-54-00-00
  DHCP Enabled. . . . . . . . : No
  IP Address. . . . . . . . . : 172.31.0.1
  Subnet Mask . . . . . . . . :


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