12-13-2006 08:30 AM
Recently we updated our CiscoWorks server from LMS 2.5 to 2.6.
Since we use the newer version, the appearance of the syslog.log has changed: The devices are listed by their IP-addresses, earlier we saw their (DNS-) hostnames.
We run a simple script every morning which generates a 24 hour syslog-summary from the syslog.log and emails it to the administrators. Earlier this email showed hostnames, now it shows IP-addresses which are not very readable/meaningful.
The report which CW generates in a browser-window shows hostnames, not IPs.
We already checked DNS on the CW-server, it works properly (reverse also).
Is there a way to make the CW-syslogserver log the hostnames instead of the IPs?
Thanks in advance,
Rolf
12-13-2006 10:47 AM
In LMS 2.6, enabling syslog DNS resolution is very easy. Go to Common Services > Server > Admin > System Preferences, and check the box for "Enable crmlogger DNS resolution." Be aware, though, that enabling this may have a performance impact depending on the volume of messages you are receiving.
12-13-2006 10:59 AM
Thank you for the quick response!
I'll give it a try tomorow when I'm in the office. Rating follows.
You mention a potential performance impact. That sounds very comprehensible.
Are there any experience values of "how much is too much"?
Thanks again.
12-13-2006 11:12 AM
We recommend no more than 200 messages per second with bursts to 1000. Without knowing the latency involved with your DNS resolution, I cannot comment on how many messages per second until you start seeing issues, but if you're receiving 50 messages per second, and it takes 1 second to do a lookup, you're actually receiving 100 per second. So DNS will effectively cut your total message capacity.
12-13-2006 11:19 PM
Thank you once again!
Unfortunately I didn't find the checkbox for enabling DNS resulution.
My fault! We're still running LMS2.5 - 2.6 is ordered but not yet installed.
Is there a way to do the same with LMS2.5?
12-14-2006 12:00 AM
Yes, but you need to manually edit the registry. The key is HKLM\SYSTEM\CurrentControlSet\Services\crmlog\Parameters\CrmDnsResolution. Set this to 1, and restart the CiscoWorks syslog service.
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