dhcpd through Relay Agent was configured once, one iface eth0 10.12.249.7/24 addresses for subnet 10.12.253.0
Here is /etc/dhcpd.conf it was not saved
###################################
ddns-updat e-style none;
shared-network ALL {
options ...
subnet 10.12.253.0 netmask 255.255.255.0 {
range 10.12.253.1 10.12.253.254;
}
}
#########################################
This configuration was working until another subnet was added 10.12.254.0 /etc/dhcpd.conf now looks like this:
#########################################
ddns-upda te-style none;
shared-network ALL {
subnet 10.12.253.0 netmask 255.255.255.0 {
range 10.12.253.1 10.12.253.254;
}
subnet 10.12.254.0 netmask 255.255.255.0 {
range 10.12.254.1 10.12.254.254;
}
}
#########################################
dhcpd cannot ba started:
No subnet declaration for eth0...
Please advise

Is the netmask for eth0 255.255.0.0?

Um, the options you've cliped out of the first one may be of some importance.

I know for sure that the line
options ...
won't work.

Thanks everybody it's solved. Local subnet also should be declared