monitoring a service

[Mario Sergio Candian]

Hi guys,

how i can to monitor a service enable for some IPs by firewall?
Ex:
if i try to give telnet in the port 110 of the server with nagios, is deny
by firewall. Look:

cyberdine:/# telnet 200.210.x.x 110
Trying 200.210.x.x...
^C
cyberdine:/#

This service (POP3) is enabled for some IPs, like:

(root at webmail) # ipfw sh | grep 110
00920        0           0 allow tcp from 200.230.x.x to me dst-port
110 setup keep-state
00930        0           0 allow tcp from 200.230.x.x to me dst-port
110 setup keep-state
00940        0           0 allow tcp from 200.210.x.x to me dst-port 110
setup
keep-state
00950        0           0 allow tcp from 200.210.x.x to me dst-port 110
setup
keep-state
00950        0           0 allow tcp from 200.246.x.x to me dst-port 110
setup keep-state
00960        2         120 deny log tcp from any to me dst-port 110 setup
keep-state

This is a server that the nagios is installed.

Any help is appreciated.

Mario Sergio



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