AIX网络诊断及解决现场实例

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=5e080863,80inet 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 %26 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！！！