How to: Keep DHCPDISCOVER messages off the console in Solaris 11

Bill Shirley bill at
Sat Mar 23 16:42:37 UTC 2019

Console messages are controlled by the kernel.printk knob.  Try
sysctl -w "kernel.printk=3 4 1 7"

I have this in /etc/sysctl.d/99-mystuff.conf which is run after a reboot:
#define KERN_EMERG    "<0>"  /* system is unusable               */
#define KERN_ALERT    "<1>"  /* action must be taken immediately */
#define KERN_CRIT     "<2>"  /* critical conditions              */
#define KERN_ERR      "<3>"  /* error conditions                 */
#define KERN_WARNING  "<4>"  /* warning conditions               */
#define KERN_NOTICE   "<5>"  /* normal but significant condition */
#define KERN_INFO     "<6>"  /* informational                    */
#define KERN_DEBUG    "<7>"  /* debug-level messages             */
#- console_loglevel: messages with a higher priority than
#  this will be printed to the console
#- default_message_level: messages without an explicit priority
#  will be printed with this priority
#- minimum_console_loglevel: minimum (highest) value to which
#  console_loglevel can be set
#- default_console_loglevel: default value for console_loglevel

# console was too verbose
kernel.printk = 3 4 1 7


On 3/22/2019 4:27 PM, Richard Westerveld wrote:
> All,
>   Not real familiar (yet) with the ISC DHCP server.  In the past we used the regular old Solaris non-ISC version.  Hopefully 
> we'll get more familiar with this one as time goes on.
>   Have it up and running - and working, from the viewpoint of what we use it for.  We don't use it for actually assigning 
> leases like a traditional use (all our clients have static IP addresses); we use it for booting already identified clients (ie 
> ones that have entries in /etc/inet/dhcpd4.conf).
>   The problem is we get lots of those DHCPDISCOVER/no free leases messages continually scrolling on the console for units that 
> haven't been identified as ones we want to net boot (there's an application that adds their entries to the conf file when 
> someone wants to boot them).
>   I'd like some way to either turn that particular message off; or else direct them to some other location.
>   I tried setting "unknown-clients" to ignore; but that apparently doesn't turn off the messages.  (Note:  I *think* these 
> requests are coming from "unknown" clients; since I haven't found their mac addresses in the conf file.)
>   I also tried setting the dhcp server to use syslog; but that doesn't seem to keep them from appearing on the console either.
>   I'm sure *someone* at some point has tried to get rid of these same messages; so can anyone point me to the proper place to 
> find out how to do it?  An example might help, too.
>   Thanks.
> -Richard
> _______________________________________________
> dhcp-users mailing list
> dhcp-users at
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <>

More information about the dhcp-users mailing list