Not all subnets are balancing
Norman Elton
normelton at gmail.com
Thu Oct 9 20:28:56 UTC 2014
I've got two DHCP servers configured for failover:
failover peer "wm-dhcp-01-02" {
primary;
address 1.2.3.4;
port 647;
peer address 1.2.3.5;
peer port 647;
max-response-delay 30;
max-unacked-updates 10;
load balance max seconds 3;
mclt 1800;
split 128;
min-balance 60;
max-balance 300;
}
I've noticed that our DHCP log file shows helpful information when
subnets get balanced:
balancing pool 7f9da82e7960 INIT-WM-HALL total 240 free 88 backup
96 lts -4 max-own (+/-)18
But this doesn't seem consistent. That is, there are some subnets that
balance, others never show up in the log. Presumably there's some
small difference between the two, but I can't figure it out. Here's a
subnet that is getting balanced:
group {
option subnet-mask 255.255.255.0;
option domain-name-servers 128.239.29.9, 128.239.20.9;
option domain-name "wm.edu";
default-lease-time 3600; # 1 hour
max-lease-time 3600; # 1 hour
shared-network INIT-WM-HALL {
subnet 10.45.170.0 netmask 255.255.255.0 {
option routers 10.45.170.1;
pool {
failover peer "wm-dhcp-01-02";
range 10.45.170.11 10.45.170.250;
}
}
}
}
And here's a seemingly similar subnet that is never showing up in the log file:
shared-network ADMIN-NET {
subnet 128.239.96.0 netmask 255.255.224.0 {
option subnet-mask 255.255.224.0;
option routers 128.239.102.1;
option domain-name-servers 128.239.29.9, 128.239.20.9;
option domain-name "wm.edu";
deny bootp;
default-lease-time 432000; # 5 days
max-lease-time 432000; # 5 days
pool {
failover peer "wm-dhcp-01-02";
range 128.239.102.10 128.239.102.254;
}
}
}
Am I missing something? Is there some reason why the first would
rebalance and the second not?
Thanks,
Norman Elton
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