On Sat, Jun 11, 2011 at 02:13:56PM +0300, Andrew O. Shadoura wrote: > This isn't really needed as it can use `ip link show` to determine the > interface status.
I'm afraid I'm not sure that is correct. Take the following example of a system that has eth0 and eth1 and only the second one (eth0) has a network cable plugged in: jfs@silicio$ ip link show eth0 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000 link/ether 00:11:2f:80:11:1b brd ff:ff:ff:ff:ff:ff jfs@silicio:$ ip link show eth1 3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000 link/ether 00:c0:df:03:c5:e9 brd ff:ff:ff:ff:ff:ff jfs@silicio:$ sudo mii-tool eth0 eth0: no link jfs@silicio:$ sudo mii-tool eth1 eth1: negotiated 100baseTx-FD flow-control, link ok And 'ip link show up' lists both of these interfaces, even if eth0 does not have a hardware link. I'm afraid that as soon as an interface is 'UP' in the system 'ip link show' will indicate it is up even though it does not have link. I would appreciate if you could proppose an exact way in which to use ip in this context. If not, I will have to close this bug. Regards Javier
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