[mrtg] monitoring iptables

Sandon Van Ness sandon at van-ness.com
Tue Mar 25 22:35:17 CET 2014

  I do something similar to just graph ipv6 table with ip6tables. 
Basically using some grep/awk with iptables (with -x so its in bytes). 
Only problem can be is if your tables are flushed often and the values 
are reset.

On 03/25/2014 02:18 PM, Steve Shipway wrote:
> IPtables keeps counters against rules, so you can use MRTG to graph 
> this. You would need to write a custom plugin for MRTG that parses the 
> output of ‘iptables –L –n –v’
> If your iptables is not on the same host as your MRTG server, then you 
> will need to run the plugin remotely using some method. Either ssh 
> with keys, NRPE with ‘mrtg-nrpe’, or something similar. This sort of 
> information is not normally in SNMP, though you could write your 
> plugin as a ucd-snmpd extension to make it so, though this is getting 
> into a bit advanced coding. I don’t think anyone else has done this 
> previously, though there was an ipchains extension for ucd-snmpd once.
> Steve
> *Steve Shipway*
> s.shipway at auckland.ac.nz
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