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 (rc.net) method is used. If the alternate method of using rc.bsdnet is used then some of these examples may not apply.
- 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
- 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
