Check Physical Network Cable Status

If we have remote server/computer with several network interfaces, sometime we will face network connection problem on certain interface. To check physical network cable status on Solaris we can use the following command :

# ndd -get /dev/fjgi link_status
1

Result 1 means cable connected, and if result 0 means cable disconnected.
By default it will read fjgi0 first, to check another fjgi interface we define the instance first then repeat the command

# ndd –set /dev/fjgi instance 2
# ndd -get /dev/fjgi link_status

If the machines using ce interfaces (Sun GigaSwift Ethernet 1.0 driver), we can’t use ndd command. But we have another option by using kstat command :

root@drc-scp14# kstat -p ce | grep link_up
ce:0:ce0:link_up        1
ce:1:ce1:link_up        1
ce:2:ce2:link_up        0
ce:3:ce3:link_up        0
ce:4:ce4:link_up        0
ce:5:ce5:link_up        1
root@drc-scp14# ifconfig -a
lo0: flags=1000849 mtu 8232 index 1
        inet 127.0.0.1 netmask ff000000
ce0: flags=9040843 mtu 1500 index 2
        inet 10.22.248.141 netmask ffffff00 broadcast 10.22.248.255
        groupname scp-front
        ether 0:14:4f:96:8c:96
ce0:1: flags=1000843 mtu 1500 index 2
        inet 10.22.248.143 netmask ffffff00 broadcast 10.22.248.255
ce1: flags=9040843 mtu 1500 index 3
        inet 10.22.248.142 netmask ffffff00 broadcast 10.22.248.255
        groupname scp-front
        ether 0:14:4f:68:6b:30
ce5: flags=1000843 mtu 1500 index 5
        inet 10.22.253.133 netmask fffffff0 broadcast 10.22.253.143
        ether 0:14:4f:96:8c:97
ce2: flags=1000803 mtu 1500 index 10
        inet 10.22.255.133 netmask fffffff0 broadcast 10.22.255.143
        ether 0:14:4f:68:6b:31
root@drc-scp14#

On Linux system we do it like this :

[root@pwsupport-ftpserver tedy]# mii-tool
eth0: negotiated 100baseTx-FD, link ok
eth1: negotiated 100baseTx-FD, link ok
[root@pwsupport-ftpserver tedy]#

Using mii-tool we can check spesific interface like this :

[root@pwsupport-ftpserver tedy]# mii-tool eth0
eth0: negotiated 100baseTx-FD, link ok
[root@pwsupport-ftpserver tedy]#

If there is no cable plugged-in then the result would be like this :

ttirtawi@tedy-laptop:~$ sudo mii-tool eth0
eth0: no link
ttirtawi@tedy-laptop:~$