[Nagiosplug-help] check_dhcp and IP aliasing

[Beltran Cambronero]

I have my nagios checking several DHCP servers and each of them serving different networks so I need to force check_dhcp to send a different giaddr to each server

The easiest way to do that is to create several interfaces (eth0:1, eth0:2, etc) with different IP's and them ask check_dhcp to bind to the interfaces using the option [-i interface]

The problem is that it doesn't seem like check_dhcp likes IP aliasing at all. It works fine if the interface is eth0 but it gives me an error if I try any of the aliased interfaces.


[root]# ./libexec/check_dhcp -v -u -s 64.89.230.195 -i eth0:1
Requested server address: 64.89.230.195
DHCP socket: 3
Error: Could not bind socket to interface eth0:1.  Check your privileges...

For that matter, it's the same error as if I use a bogus string:

[root]# ./libexec/check_dhcp -v -u -s 64.89.230.195 -i foobar
Requested server address: 64.89.230.195
DHCP socket: 3
Error: Could not bind socket to interface foobar.  Check your privileges...


[root]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:0C:29:24:CD:59
          inet addr:192.168.0.221  Bcast:192.168.0.223  Mask:255.255.255.224
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:95045 errors:0 dropped:0 overruns:0 frame:0
          TX packets:75661 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:23443043 (22.3 MiB)  TX bytes:15651222 (14.9 MiB)
          Interrupt:177 Base address:0x1400

eth0:1    Link encap:Ethernet  HWaddr 00:0C:29:24:CD:59
          inet addr:10.0.4.254  Bcast:10.0.4.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Interrupt:177 Base address:0x1400

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:45114 errors:0 dropped:0 overruns:0 frame:0
          TX packets:45114 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:8798317 (8.3 MiB)  TX bytes:8798317 (8.3 MiB)


Any suggestions?


Thanks,
Beltran
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