Network Configuration commands in AIX

The examples here assume that the default TCP/IP configuration (rc.net) method is used. If the alternate method of using rc.bsdnet is used then some of these examples may not apply.

Also Read:  AIX Basic concepts and commands

• Determine if rc.bsdnet is used over rc.net 

                     lsattr -El inet0 -a bootup option

• TCP/IP related daemon startup script

                      /etc/rc.tcpip

• To view the route table

                        netstat -r

• To view the route table from the ODM DB

                      lsattr -EHl inet0 -a route

• Temporarily add a default route

                       route add default 192.168.1.1

• Temporarily add an address to an interface

                      ifconfig en0 192.168.1.2 netmask 255.255.255.0

• Temporarily add an alias to an interface

                    ifconfig en0 192.168.1.3 netmask 255.255.255.0 alias

• To permanently add an IP address to the en1 interface

                  chdev -l en1 -a netaddr=192.168.1.1 -a netmask=0xffffff00

• Permanently add an alias to an interface

                   chdev -l en0 -a alias4=192.168.1.3,255.255.255.0

• Remove a permanently added alias from an interface

                   chdev -l en0 -a delalias4=192.168.1.3,255.255.255.0

Also Read: AIX Scenario based questions

• List ODM (next boot) IP configuration for interface

                    lsattr -El en0

• Permanently set the hostname

                    chdev -l inet0 -a hostname=tsmserver

• List networking devices

                       lsdev -Cc tcpip

• List Network Interfaces

                          lsdev -Cc if

• List attributes of inet0

                          lsattr -Ehl inet0

• List (physical layer) attributes of ent0

                           lsattr -El ent0

• List (networking layer) attributes of en0

                          lsattr -El en0

• Set (desired) speed is found through the entX device

                       lsattr -El ent0 -a media speed

• Find actual (negotiated) speed, duplex, and link

                entstat -d ent0 ----- The interface must be up (ifconfig en0 up) for stats to be valid

• Set the ent0 link to Gig full duplex

           chdev -l ent0 -a media speed=1000 Full Duplex -P
                 Auto Negotiation is another option

• Turn off Interface Specific Network Options

                   no -p -o use isno=0

• Get (long) statistics for the ent0 device (remove -d for shorter results) 

                entstat -d ent0 ⇐or⇒ netstat -v ent0 
         The results of entstat vary by device type. Virtual, physical, and IVE (LHEA) devices all produce different results.

• List all open, and in use TCP and UDP ports

                    netstat -anf inet

• List all LISTENing TCP ports

                     netstat -na | grep LISTEN

• Remove all TCP/IP configuration from a host

                       rmtcpip

• Flush the netcd DNS cache

                       netcdctrl -t dns -e hosts -f

• Hostname lookup order is determined using 

                    /etc/irs.conf, /etc/netsvc.conf and then $NSORDER. 
             irs.conf and $NSORDER are typically not used.

• IP packets can be captured using 

                     iptrace / ipreport or tcpdump