Shared network thresholds

project722 project722 at gmail.com
Tue Nov 22 20:42:02 UTC 2016


For one of our markets we are using the "shared network" directive. Config
looks like this:

shared-network "mysharednetwork" {
option domain-name "example.com";
subnet 192.168.100.0 netmask 255.255.255.0 {
option broadcast-address 192.168.100.255;
option routers 192.168.100.1;

        pool {
                range 192.168.100.10 192.168.100.254;
              }
          }

subnet 192.168.200.0 netmask 255.255.255.0 {
option broadcast-address 192.168.200.255;
option routers 192.168.200.1;

        pool {
                 range 192.168.200.10 192.168.200.254;
                }
             }
          }

When I implemented the shared network for this market, the primary subnet
192.168.100.0 was around 80% max. Its now at 90% and still climbing. The
secondary is taking on leases but I want to know what logic controls
whether or not new turn-ups get addresses from the primary or secondary? Is
there an option or directive I can add to tell dhcpd to hover around the
80% mark on the primary? What's going to happen if dhcpd maxes it out? I'm
sure new turn-ups would go into the secondary pool but I'd like to have at
least a 15% buffer.

We have another DHCP server that also uses a shared network and its primary
seems to stay around 80-85% max. Seems like dhcpd has its own logic for
this.
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