In my pc under linux Scientific Linux 6.4 I have many ethernet
interfaces ( managed through Network Manager) eth0 connects to the
switch, I'm not concerned about that. eth1 used to connect directly to
another pc. Most of the time I don't use it, and there's nothing plugged
into it.
The problem is when nothing is plugged into eth1 the ip address
(192.168.5.1) associated with it is not available, as you can see:
Eth1 plugged:
# ip address show
1: lo: mtu 16436 qdisc noqueue state UNKNOWN link/loopback
00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host valid_lft forever preferred_lft forever
2: eth0: mtu 1500 qdisc mq state UP qlen 1000 link/ether
e4:1f:13:e1:55:d8 brd ff:ff:ff:ff:ff:ff inet 192.168.1.12/24 brd
192.168.1.255 scope global eth0 inet6 fe80::e61f:13ff:fee1:55d8/64 scope
link valid_lft forever preferred_lft forever
3: eth1: mtu 1500 qdisc mq state UP qlen 1000 link/ether
e4:1f:13:e1:55:d9 brd ff:ff:ff:ff:ff:ff inet 192.168.5.1/24 brd
192.168.5.255 scope global eth1 inet6 fe80::e61f:13ff:fee1:55d9/64 scope
link valid_lft forever preferred_lft forever
Eth1 not plugged: # ip address show
1: lo: mtu 16436 qdisc noqueue state UNKNOWN link/loopback
00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host valid_lft forever preferred_lft forever
2: eth0: mtu 1500 qdisc mq state UP qlen 1000 link/ether
e4:1f:13:e1:55:d8 brd ff:ff:ff:ff:ff:ff inet 192.168.1.12/24 brd
192.168.1.255 scope global eth0 inet6 fe80::e61f:13ff:fee1:55d8/64 scope
link valid_lft forever preferred_lft forever
3: eth1: mtu 1500 qdisc mq state DOWN qlen 1000 link/ether
e4:1f:13:e1:55:d9 brd ff:ff:ff:ff:ff:ff inet6
fe80::e61f:13ff:fee1:55d9/64 scope link valid_lft forever preferred_lft
forever
How can I get the ip 192.168.5.1 eth1 available even if it is not
connected (plugged to another pc/switch) ?
