CheckCable prints out the status of the network interfaces links on Solaris. # checkcable Interface Link Duplex Speed AutoNEG hme0 UP FULL 100 ON The above shows my hme0 has a cable plugged in (Link is UP), is in full duplex mode, and is running at 100 Mb/s. The Link UP reported is different from that which ifconfig prints (ifconfig is just showing if the interface is enabled). This is what happened after I unplugged the network cable, # checkcable Interface Link Duplex Speed AutoNEG hme0 DOWN FULL 100 ON /var/adm/messages has also had the following line added, Mar 21 03:22:03 mars hme: [ID 786680 kern.notice] SUNW,hme0 : No response from Ethernet network : Link down -- cable problem? The following example is on a Solaris x86 server, # checkcable Interface Link Duplex Speed AutoNEG rtls0 ??? FULL 100 ??? This card does not provide enough status info to populate all fields. This is common on x86 cards or older Sun cards (eg "le").