Network Configuration commands in AIX

In IBM AIX operating System, entX is the physical device. It is associated with physical layer settings such as link speed, and duplex. enX and etX determine the frame type run on entX . IP addresses are configured on enX (Standard Ethernet) or etX (802.3). In a typical AIX network configuration only enX is used.

The examples here assume that the default TCP/IP configuration ( 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 
                     lsattr -El inet0 -a bootup option
  • TCP/IP related daemon startup script
  • 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
  • Temporarily add an address to an interface
                      ifconfig en0 netmask
  • Temporarily add an alias to an interface
                    ifconfig en0 netmask alias
  • To permanently add an IP address to the en1 interface
                  chdev -l en1 -a netaddr= -a netmask=0xffffff00
  • Permanently add an alias to an interface
                   chdev -l en0 -a alias4=,
  • Remove a permanently added alias from an interface
                   chdev -l en0 -a delalias4=,

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
  • 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

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