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Community Member

CW: Hostname instead of IP-addresses in syslog.log

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

5 REPLIES
Cisco Employee

Re: CW: Hostname instead of IP-addresses in syslog.log

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.

Community Member

Re: CW: Hostname instead of IP-addresses in syslog.log

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.

Cisco Employee

Re: CW: Hostname instead of IP-addresses in syslog.log

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.

Community Member

Re: CW: Hostname instead of IP-addresses in syslog.log

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?

Cisco Employee

Re: CW: Hostname instead of IP-addresses in syslog.log

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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