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<p>Ok, I made some progress.</p>
<p>The vendor of the firewall provided OID that I <span>used with snmpget to find out the engineID of the firewall.</span></p>
<p><span>Then I used snmpkey to generate authkey and privkey to use in SnmpOptions in MRTG config file.</span></p>
<p><span>Also used Perl Package Manager to add Net-Snmp and Crypt-des packages on the server that runs MRTG.</span></p>
<p><span>Then I added "</span><span><span>EnableSnmpV3: yes" and SnmpOptions to Target interfaces of the firewall in mrtg.cfg<span> file, and configured Snmpv3 on the firewall accordingly and restarted MRTG service.</span></span></span></p>
<p><span><span><span>MRTG graphs are stuck on the last values and draw a straight horizontal line, so something does not work right.</span></span></span></p>
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<p><span>This is one of the targets (<span>I replaced IP address of the router with <routerIP>, the actual username with <username>, and used "..." instead of a number in hex format.</span>):</span></p>
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<p><span>Target[<routerIP>_2]: 2:public@<routerIP>:::::3 SnmpOptions[<routerIP>_2]: username=>'<username>', authprotocol=>'md5', authkey=>'0x...', privprotocol=>'des', privkey=>'0x...'</span></p>
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<p><span>Is there something wrong here, or do I need to check something else?</span></p>
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<p><span>Thanks!</span></p>
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