How to check NIC speed in Unix

Fast Ethernet connection is essential for some operations to work properly.
backup, oracle RAC all require fast Ethernet connection.

Different OS provides different commands to check the network speed currently running.

In Linux, we can run mii-tool or ethtool to check the network speed. Both commands require root access

[root@localhost eth0]# mii-tool eth0
eth0: no autonegotiation, 100baseTx-FD, link ok

[root@localhost eth0]# ethtool eth0
Settings for eth0:
        Supported ports: [ TP ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Advertised pause frame use: No
        Advertised auto-negotiation: Yes
        Speed: 1000Mb/s
        Duplex: Full
        Port: Twisted Pair
        PHYAD: 0
        Transceiver: internal
        Auto-negotiation: on
        MDI-X: Unknown
        Supports Wake-on: umbg
        Wake-on: d
        Current message level: 0x00000007 (7)
        Link detected: yes

In Solaris, we can run kstat or dladm to check the network speed

$ kstat -m igb -i 0 | egrep 'link_autoneg|link_speed|link_duplex'
        link_autoneg                    1
        link_duplex                     2
        link_speed                      100

The output shows that, igb0 is running autonegotiation, 100 Mbps full-duplex

if we have root access, we can run dladm or ndd to check the network speed.

In AIX, we can run entstat to check network speed.
if we want to check the speed of en0

$ entstat -d en0 | egrep '^Device|^Media'
Device Type: 2-Port 10/100/1000 Base-TX PCI-X Adapter (14108902)
Media Speed Selected: Auto negotiation
Media Speed Running: 100 Mbps Full Duplex

We can see that en0 supports upto 1000 Mbps, but it's running 100 Mbps Full Duplex.

In HP-UX, we can run lanadmin or nwmgr to check the network speed.
lanadmin output is shorter

$ /usr/sbin/lanadmin -x 0
Speed = 1000 Full-Duplex.
Autonegotiation = On.

we can also use nwmgr to get detailed information

$ /usr/sbin/nwmgr --get --stats -C lan -I 0

***          lan0 64 bit MIB statistics:
Interface Name               = lan0
PPA Number                   = 0
Description                  = lan0 HP PCI 1000Base-T Release B.11.31.0809.01
Interface Type               = 1000Base-T
MTU Size                     = 1500
Speed                        = 1 Gbps
Station Address              = 0x0A527E583C90
Administration Status        = UP
Operation Status             = UP
Last Change                  = Wed Mar 20 05:58:50 2013
Inbound Octets               = 166627219743
Inbound Unicast Packets      = 975967141
Inbound Multicast Packets    = 1124454
Inbound Broadcast Packets    = 6566058
Inbound Discards             = 1821280
Inbound Errors               = 0
Inbound Unknown Protocols    = 1124769
Outbound Octets              = 185484791114
Outbound Unicast Packets     = 968101273
Outbound Multicast Packets   = 0
Outbound Broadcast Packets   = 1618
Outbound Discards            = 0
Outbound Errors              = 0
Counter Discontinuity Time   = Wed Mar 20 05:58:50 2013
Physical Promiscuous Mode    = FALSE
Physical Connector Present   = TRUE
Interface Alias              =
Link Up/Down Trap Enable     = Enabled

How to get the process listening on certain port

At times we are asked: "what program is listening on port XX?"

In Redhat, we can easily get this using lsof. let's say if we want to know which program is listening on port 80.
[root@localhost ~]# lsof -i :80
COMMAND  PID   USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
httpd   2047   root    4u  IPv6  12636      0t0  TCP *:http (LISTEN)
httpd   2049 apache    4u  IPv6  12636      0t0  TCP *:http (LISTEN)
httpd   2050 apache    4u  IPv6  12636      0t0  TCP *:http (LISTEN)
httpd   2051 apache    4u  IPv6  12636      0t0  TCP *:http (LISTEN)
httpd   2052 apache    4u  IPv6  12636      0t0  TCP *:http (LISTEN)
httpd   2053 apache    4u  IPv6  12636      0t0  TCP *:http (LISTEN)
httpd   2054 apache    4u  IPv6  12636      0t0  TCP *:http (LISTEN)
httpd   2055 apache    4u  IPv6  12636      0t0  TCP *:http (LISTEN)
httpd   2056 apache    4u  IPv6  12636      0t0  TCP *:http (LISTEN)

From the output, we know that httpd is listening on port 80.

Another way to get the process listening on certain port is using netstat.
[root@localhost ~]# netstat -anp | grep 80
tcp        0      0 :::80     :::*            LISTEN      2009/httpd
 
[root@localhost ~]# ps -ef | awk '$2 == 2009'
root      2009     1  0 23:21 ?        00:00:00 /usr/sbin/httpd
 
[root@localhost ~]#
In AIX, most of the time it has no lsof installed, and the netstat is also different from Redhat, but we still can get our question answered.
$ netstat -Aan | grep '.22 ' | grep LISTEN
f1000e0001382bb8 tcp4   0  0  *.22          *.*        LISTEN

$ rmsock f1000e0001382bb8 tcpcb
The socket 0xf1000e0001382808 is being held by proccess 3670142 (sshd).
 
$ ps -ef | grep 3670142
root 3670142 3014676   0   Sep 06      -  0:00 /usr/sbin/sshd

Please note rmsock will not remove the socket, you can confirm this by checking the content of /var/adm/ras/rmsock.log.

reference: http://unix.ittoolbox.com/groups/technical-functional/ibm-aix-l/determine-which-process-is-listening-on-a-port-without-using-lsof-on-aix-1468555