Hi!
I am having hard time getting dhcpd with synchronisation to work. What i
have is two OpenBSD v. 5.0 working in the same subnet as test dhcp
servers and third as dhcp client. Each computer has actually two network
interfaces, one for remote access and the other for playing with dhcp.
They are vmware esx guests and pf is disabled, also they are fresh v.
5.0 installs. Time is the same on all.
To see how dhcp syncronisation works i thought to start with such an
aim: servers have simple dhcpd.conf which configures ip address from a
range to the client and does so with short lease-time. Then client
starts renewing it lease and as a sign on successful sync i expect to
see then /var/db/dhcpd.leases files are kept identical on both dhcp
servers. (Please comment if this is valid expectation.)
As a result my client gets leases and dhcp servers exchange udp packets
but no apparent leases file syncronisation is seen. I would be thankful
if you could point me to the right direction.
Dhcp servers have such dhcpd.conf (not digest identical but content
identical)
# cat /etc/dhcpd.conf
option domain-name "auul";
option domain-name-servers 10.0.9.4, 10.0.9.5;
max-lease-time 60;
default-lease-time 60;
subnet 10.0.101.0 netmask 255.255.255.0 {
range 10.0.101.100 10.0.101.149;
}
/var/db/dhcpd.key files are identical
and dhcpd is started like this
host-101-189# dhcpd -d -f -Y 10.0.101.190 -y 10.0.101.189 em1
host-101-190# dhcpd -d -f -Y 10.0.101.189 -y 10.0.101.190 em1
When i start client like
# dhclient -d em1
then i see on the network that both dhcp servers answer and both send
one udp packet one to the other port 8067. Afterwards, dhcp client asks
renewal directly mostly from one dhcp server and gets a new lease
(answering dhcp server sends one udp packet to the other one after that).
Letting it to work for some time i end up with one dhcp server having
two leases in dhcpd.leases, the other server has tens of leases in its
dhcpd.leases and client has in its leases the first lease from on and
the rest from other dhcp server (as indicated with option
dhcp-server-identifier).
Imre
PS With netstat -np udp i a see both are 8067 listening.
