check_dhcp failing to return OK from virtualised DHCP servers

[Steve Hennerley]

Hi All,

I've been tearing my hair out and unsuccessfully googling this problem for what feels like a lifetime... I'm coming to the conclusion I've missed something blindingly obvious as nobody else in the world seems to have my problem.

I have a Nagios 2 server (standalone machine) monitoring my environment.  In the same subnet are 2 domain controllers, each providing DHCP (separate scopes as per M$ guidelines).  The kicker appears to be that since these two servers are virtualised, the check_dhcp plugin seems to think that the DHCP addresses are coming from the VIRTUAL HOST via the servers as a proxy.

Check_dhcp is version:  check_dhcp v1.4.15 (nagios-plugins 1.4.15)

Here's my check_dhcp output - I'm looking to find either 192.168.1.12 or 192.168.1.11 as DHCP addresses from the servers. (the VMhost they live on is 192.168.1.1)  (IPs changed to protect the innocent!)

# ./check_dhcp -v -s 192.168.1.12 -s 192.168.1.11
Requested server address: 192.168.1.12
Requested server address: 192.168.1.11
DHCP socket: 3
Hardware address: xx:xx:xx:xx:xx
DHCPDISCOVER to 255.255.255.255 port 67
DHCPDISCOVER XID: 294279994 (0x118A5B3A)
DHCDISCOVER ciaddr:  0.0.0.0
DHCDISCOVER yiaddr:  0.0.0.0
DHCDISCOVER siaddr:  0.0.0.0
DHCDISCOVER giaddr:  0.0.0.0
send_dhcp_packet result: 548




recv_result_1: 300
recv_result_2: 300
receive_dhcp_packet() result: 300
receive_dhcp_packet() source: 192.168.1.12
Result=OK
DHCPOFFER from IP address 192.168.1.1 via 192.168.1.12
DHCPOFFER XID: 294279994 (0x118A5B3A)
DHCPOFFER chaddr: 00065B22CF10
DHCPOFFER ciaddr: 0.0.0.0
DHCPOFFER yiaddr: 192.168.0.8
DHCPOFFER siaddr: 192.168.1.1
DHCPOFFER giaddr: 0.0.0.0
Option: 53 (0x01)
Option: 1 (0x04)
Option: 58 (0x04)
Option: 59 (0x04)
Lease Time: 0 seconds
Renewal Time: 43200 seconds
Rebinding Time: 75600 seconds
Added offer from server @ 192.168.1.1 of IP address 192.168.0.8


recv_result_1: 300
recv_result_2: 300
receive_dhcp_packet() result: 300
receive_dhcp_packet() source: 192.168.1.11
Result=OK
DHCPOFFER from IP address 192.168.1.1 via 192.168.1.11
DHCPOFFER XID: 294279994 (0x118A5B3A)
DHCPOFFER chaddr: 00065B22CF10
DHCPOFFER ciaddr: 0.0.0.0
DHCPOFFER yiaddr: 192.168.1.106
DHCPOFFER siaddr: 192.168.1.1
DHCPOFFER giaddr: 0.0.0.0
Option: 53 (0x01)
Option: 1 (0x04)
Option: 58 (0x04)
Option: 59 (0x04)
Lease Time: 0 seconds
Renewal Time: 43200 seconds
Rebinding Time: 75600 seconds
Added offer from server @ 192.168.1.1 of IP address 192.168.1.106


No (more) data received (nfound: 0)
Result=ERROR
Total responses seen on the wire: 2
Valid responses for this machine: 2
CRITICAL: Received 2 DHCPOFFER(s), 0 of 2 requested servers responded, max lease time = 0 sec.



Grrrrrrrr.... It's so frustrating knowing the plugin is seeing my servers but misinterpreting what it's seeing!

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