nagios on VPN gateway: ping trouble

[dick at uchicago.edu]

greetz,

i have successfully installed nagios-2.0b4p0-chroot and its related packages,
nagios-plugins-1.4.1 and nagios-web-2.0b4-chroot, on my home firewall/VPN
gateway that's running openbsd-3.8 release. i'm starting simple and doing a
check_ping on all my local machines (10.9.0/24 and 10.9.1/24 subnets), which is
working great and i can see their status under the nagios web interface. now
that i have check_ping working for my local machines, i want to do the same for
hosts at my remote location (10.0.0/24 and 10.0.1./24 subnets) that are under
the same VPN.

however, i am not able to check_ping for 10.0.0.1, the remote VPN gateway, even
though i'm able to ping it from my home VPN gateway. since my home VPN gateway
has both a public IP, x.y.z.w, and a private IP, 10.9.0.1, i have to issue a
"ping -I 10.9.0.1 10.0.0.1" to ping the remote VPN gateway via the VPN,
otherwise the interface address transmitted falls outside my VPN subnet
(10.9/16) and the ping doesn't get routed through the VPN. i changed the
ping_syntax variable in cgi.cfg from "/bin/ping -n -c 5 $HOSTADDRESS$" to
"/bin/ping -I 10.9.0.1 -n -c 5 $HOSTADDRESS$" to try to remedy the problem, but
it hasn't done the trick.

just to be clear, here is an text rendering of the situation:

  #########################              #############################
  # home VPN gw           #              # work VPN gw               #
  # pub. IP = x.y.z.w     #--internet----# pub. IP = a.b.c.d         #
  # priv. IP = 10.9.0.1   #              # priv. IP = 10.0.0.1       #
  # VPN for 10.9/16       #              # VPN for 10.0/16           #
  #########################              #############################

am i not supposed to run nagios on such a gateway? i could move it to another
machine behind the gateway at home, but i would rather not for computing
resource reasons. any suggestions on how to successfully check_ping in this
situation would be appreciated. thx for reading.

cheers,
jake


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