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在Linux中安裝兩塊網卡網絡不通的解決方法

  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不通服務器,我網卡的驅動都安裝了,ping 自己的兩塊網卡的IP都能通,可就時訪問不了服務器。我輸入http://172.31.0.101就提示‘當試圖與172.31.0.101聯系時,連接被拒絕’”     我來到小王的機器前查看了一下網絡配置。    [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裡不太好挪動。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。既然不方便換端口最簡單的就把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 Corporation3c905C-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加載3Com網卡的驅動哦。   從啟動我們的網絡   [root@rhas root]# service network restart   正在關閉接口 eth0: [ 確定 ]   關閉環回接口: [ 確定 ]   設置網絡參數: [ 確定 ]   彈出環回接口: [ 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]#       此時訪問網絡沒有問題,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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