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AIX网络诊断及解决现场实例

新客网 XKER.COM 2008-02-17 来源:新客网Unix系统 佚名 收藏本文

  【新客网aix教程】问题:有两台aix的测试机器,一台做应用,一台做数据库,都在同一个网段下(无双机),其中应用网络没有问题,而数据库这台网络有问题,内网下载只有30几K。

  解决方法:对比法

  由于这两台机器属于同一网段,机型完全一样,可以将两台机器的网络设置进行细致的对比,看看有何差异,然后改之。

  使用netstat -v ent0 | grep -p "Specific Statistics"命令分别查看两台机器应用:

  netstat -v ent0 | grep -p "Specific Statistics"
  10/100 Mbps Ethernet PCI Adapter II (1410ff01) Specific Statistics:
  --------------------------------------------------------------------
  Link Status: Up
  Media Speed Selected: Auto negotiation
  Media Speed Running: 100 Mbps Full Duplex
  Receive Pool Buffer Size: 1024
  Free Receive Pool Buffers: 1024
  No Receive Pool Buffer Errors: 0
  Receive Buffer Too Small Errors: 0
  Entries to transmit timeout routine: 0
  Transmit IPsec packets: 0
  Transmit IPsec packets dropped: 0
  Receive IPsec packets: 0
  Receive IPsec packets dropped: 0
  Inbound IPsec SA offload count: 0
  Transmit Large Send packets: 0
  Transmit Large Send packets dropped: 0
  Packets with Transmit collisions:
  1 collisions: 0 6 collisions: 0 11 collisions: 0
  2 collisions: 0 7 collisions: 0 12 collisions: 0
  3 collisions: 0 8 collisions: 0 13 collisions: 0
  4 collisions: 0 9 collisions: 0 14 collisions: 0
  5 collisions: 0 10 collisions: 0 15 collisions: 0

  数据库:

  netstat -v ent0 | grep -p "Specific Statistics"
  10/100 Mbps Ethernet PCI Adapter II (1410ff01) Specific Statistics:
  --------------------------------------------------------------------
  Link Status: Up
  Media Speed Selected: 100 Mbps Half Duplex
  Media Speed Running: 100 Mbps Half Duplex
  Receive Pool Buffer Size: 1024
  Free Receive Pool Buffers: 1024
  No Receive Pool Buffer Errors: 0
  Receive Buffer Too Small Errors: 0
  Entries to transmit timeout routine: 0
  Transmit IPsec packets: 0
  Transmit IPsec packets dropped: 0
  Receive IPsec packets: 0
  Receive IPsec packets dropped: 0
  Inbound IPsec SA offload count: 0
  Transmit Large Send packets: 0
  Transmit Large Send packets dropped: 0
  Packets with Transmit collisions:
  1 collisions: 233543413 6 collisions: 0 11 collisions: 0
  2 collisions: 0 7 collisions: 0 12 collisions: 0
  3 collisions: 0 8 collisions: 0 13 collisions: 0
  4 collisions: 0 9 collisions: 0 14 collisions: 0
  5 collisions: 0 10 collisions: 0 15 collisions: 0

  仔细对比发现数据库这台显然是双工模式与应用这台不同,应用的机器是自适应的,运行时是100M全双工模式,而数据库的机器限制为100M半双工模式,现在就是要将数据库这台改成与应用一样

  更改双工模式的命令为smitty chgenet ,但是在此之前要将需要更改的网卡down掉,以及所有经过此网卡的服务停止

  步骤如下:

  ifconfig -a
  输出:
  en0: flags=5e080863,80<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,
  MULTICAST,GROUPRT,64BIT,CHECKSUM_OFFLOAD,PSEG,CHAIN>
  inet 10.100.10.6 netmask 0xffffff00 broadcast 10.100.10.255
  再输入:
  ifconfig en0 down
  ifconfig en0 detach
  smitty chgennt

  输出:
  [Entry Fields]
  Ethernet Adapter ent0
  Description 10/100 Mbps Ethernet PCI Adapter II (1410ff01)
  Status Available
  Location 1L-08
  Transmit descriptor queue size [512]
  Receive descriptor queue size [512]
  Software transmit queue size [8192]
  Receive buffer pool size [1024]
  Media Speed Auto_Negotiation
  IPsec Offload no
  Enable hardware transmit and receive checksum yes
  Enable TCP Large Send Offload no
  Enable Link Polling no
  Time interval for Link Polling [500]
  Enable ALTERNATE ETHERNET address no
  ALTERNATE ETHERNET address [0x000000000000]
  Apply change to DATABASE only no

  更改之后需要重新设置默认网关(原来的会丢失)
  smitty tcpip
  Minimum Configuration & Startup
  输出:
  [Entry Fields]
  * HOSTNAME [TEST1-CRM-DB-CLS]
  * Internet ADDRESS (dotted decimal) [10.100.10.8]
  Network MASK (dotted decimal) [255.255.255.0]
  * Network INTERFACE en0
  NAMESERVER
  Internet ADDRESS (dotted decimal) []
  DOMAIN Name []
  Default Gateway
  Address (dotted decimal or symbolic name) [10.100.10.1]
  Cost [0]
  Do Active Dead Gateway Detection? no
  Your CABLE Type N/A
  START TCP/IP daemons Now no

  最后将网卡启用
  ifconfig en0 up
  问题得到解决!!!!
  

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