Hi, I have been having trouble configuring MRTG to monitor traffic correctly from servers with Gigabit cards.
I'm running MRTG, version mrtg-2.10.15-1 on a Scientific Linux 4.1 (free rebuild of Red Hat Enterprise Linux 4 Update 1). The machines I'm trying to monitor are SL 3.0.2 (RHEL 3 U 2), which have net-snmp-5.0.9-2.30E.3. cfgmaker --output=/etc/mrtg/phnxbox.cfg --snmp-options=:::::3 --ifref=ip --global "workdir: /var/www/mrtg/" phnxbox0 phnxbox1 phnxbox2 phnxbox3 phnxbox4 phnxbox5 First hint of a problem was that MaxBytes came to 12.5 Mbyte/sec, so snmp doesn't seem to get quite the right idea about the card. Googling told me that you could override that by adding to /etc/snmp/snmpd.conf: > # ifName Type Speed > interface eth0 6 1000000000 > interface eth1 6 1000000000 Fair enough. But I think I can clearly see a problem with the counters rolling over 32 bits, so that my tranfer rate is misreported by 0xffffffff/(1E6*5*60) Mbyte/sec, about 14 Mbyte/sec, so that when I have an 18 Mbyte/sec transfer going, I see it as 4 Mbyte/sec. I tried snmp 2, but then > --base: snmpget [EMAIL PROTECTED]:::::2:v4only for ifHighSpeed.1 -> Mb/s > --base: snmpget [EMAIL PROTECTED]:::::2:v4only for ifHCInOctets.1 -> --base: check for HighspeedCounters failed ... Dropping back to V1 > --base: snmpget [EMAIL PROTECTED]:::::2:v4only for ifHighSpeed.2 -> Mb/s > --base: snmpget [EMAIL PROTECTED]:::::2:v4only for ifHCInOctets.2 -> --base: check for HighspeedCounters failed ... Dropping back to V1 > --base: snmpget [EMAIL PROTECTED]:::::2:v4only for ifHighSpeed.3 -> Mb/s > --base: snmpget [EMAIL PROTECTED]:::::2:v4only for ifHCInOctets.3 -> --base: check for HighspeedCounters failed ... Dropping back to V1 and snmp 1 surely has this issue. (I'm not completely sure what's happening with snmp 3, even though it seems to work, because I can't figure out how to snmpwalk -v 3.) The only thing that did any good was to reduce the polling time to 1 minute in the crontab file, /etc/cron.d/mrtg, but then you can't specify the Interval: 1 in the .cfg file without an error, even though at least for some values, it looks about right, although I didn't test it to the highest speeds. -- John Haggerty email: [EMAIL PROTECTED] voice/fax: 631 344 2286/4592 http://www.phenix.bnl.gov/~haggerty -- Unsubscribe mailto:[EMAIL PROTECTED] Archive http://lists.ee.ethz.ch/mrtg FAQ http://faq.mrtg.org Homepage http://www.mrtg.org WebAdmin http://lists.ee.ethz.ch/lsg2.cgi
