[mrtg] Graphing VPN SAs from Sonicwall

[Peter Erickson]

I am trying to graph the amount of information that is encrypted from our vpn gateway, but am running into a problem. Within the sonicwall, there is an index into a table for each SA. Since the sonicwall doest have a OID for all info encrypted and decrypted, im taking each SA and adding them all together. So currently, the cfg file looks like:

Target[Sonic_vpn]:    1.3.6.1.4.1.8741.1.3.2.1.1.1.9.38&1.3.6.1.4.1.8741.1.3.2.1.1.1.11.38:user at 172.20.1.2
                    + 1.3.6.1.4.1.8741.1.3.2.1.1.1.9.39&1.3.6.1.4.1.8741.1.3.2.1.1.1.11.39:user at 172.20.1.2
                    + ...
SetEnv[Sonic_vpn]: MRTG_INT_IP="172.20.1.2" MRTG_INT_DESCR="eth0"
Options[Sonic_vpn]: noinfo,nopercent
MaxBytes[Sonic_vpn]: 1250000
Title[Sonic_vpn]: VPN Traffic Analysis for SonicWALL PRO/100
PageTop[Sonic_vpn]: <H1>VPN Traffic Analysis for SonicWALL PRO/100</H1>
 <TABLE>
   <TR><TD>System:</TD>     <TD>PRO/100 in Edina</TD></TR>
   <TR><TD>Maintainer:</TD> <TD>hostmaster at evalumed.com</TD></TR>
   <TR><TD>Description:</TD><TD>eth0  </TD></TR>
   <TR><TD>ifType:</TD>     <TD>ethernetCsmacd (6)</TD></TR>
   <TR><TD>ifName:</TD>     <TD></TD></TR>
   <TR><TD>Max Speed:</TD>  <TD>1250.0 kBytes/s</TD></TR>
   <TR><TD>Ip:</TD>         <TD>172.20.1.2</TD></TR>
 </TABLE>

As I was running MRTG, I just realized that as these SAs are created and torn down, the index into the tables change and when an SA goes away,. MRTG stops graphing an starts emailing me all these errors. The first value of the target is EncryptedByteCount and the second is DecryptedByteCount. The question that I have is this. Is there a way to setup the target so that it goes through all possible values within the ByteCount arrays and adds the values or do I need to write a custom script that will do this for me and set the target to that value? And if I need to write a script, can someone point me in the right direction for finding out how to do this?

I really appreciate any help on this one. Im on a short timeline. Thanks.
-- 
Peter Erickson

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