Strange configuration problem

[Petar Kozić]

Hi,
I have a strange problem with isc-dhcp-server 4.0 on Ubuntu 18.04. I tried
everything, read documentation, forums, etc.. but I can't solve problem.

I have server with two vlan interface which is connected on vswitch. Both
interfaces have set of public IP addresses.
All that is ok and address is reachable and works.

My interfaces name is vmbr0 and vmbr0:2
Both interface I have set in /etc/default/isc-dhcp-server

INTERFACESv4="vmbr0 vmbr0:2"

In dhcpd.conf I have:


#
# Global options
#

authoritative;
log-facility local7;
default-lease-time 3600;
max-lease-time 7200;

#
# Subnet declarations
#
subnet 116.199.70.96 netmask 255.255.255.240 {
default-lease-time 3600;
option routers 116.199.70.97;
option interface-mtu 1400;
option subnet-mask 255.255.255.240;
option broadcast-address 116.199.70.111;
option domain-name-servers 8.8.8.8, 8.8.4.4;
range 116.199.70.98 116.199.70.110;
}

subnet 116.199.68.208 netmask 255.255.255.240 {
default-lease-time 3600;
option routers 116.199.68.209;
option interface-mtu 1400;
option subnet-mask 255.255.255.240;
option broadcast-address 116.199.68.223;
option domain-name-servers 8.8.8.8, 8.8.4.4;
range 116.199.68.210 116.199.68.222;
}

## IP reservation from first subnet ##

host myhost1 {
hardware ethernet FE:4A:DB:C0:BF:AD;
fixed-address 116.199.70.98;
}
host myhost2 {
hardware ethernet AA:6D:47:76:58:58;
fixed-address 116.199.70.99;
}
host myhost3 {
hardware ethernet 86:CB:59:8B:CD:BA;
fixed-address 116.199.70.100;
}
host myhost4 {
hardware ethernet D6:9R:79:44:93:AD;
fixed-address 116.199.70.101;
}
host myhost5 {
hardware ethernet 06:BW:15:DD:09:79;
fixed-address 116.199.70.102;
}

## IP reservation from second subnet ##

host myhost6 {
hardware ethernet A6:88:27:56:E8:3A;
fixed-address 116.199.68.210;
}
host myhost7 {
hardware ethernet 82:62:6C:7B:AB:74;
fixed-address 116.199.68.211;
}
host myhost8 {
hardware ethernet CA:A1:7C:C3:D4:B3;
fixed-address 116.199.68.217;
}
host myhost9 {
hardware ethernet F1:A6:7B:25:57:F4;
fixed-address 116.199.68.219;
}
host myhost10 {
hardware ethernet BE:87:BF:DB:F4:9E;
fixed-address 116.199.68.218;
}


My problem is in that because the client in IP reservation sometimes gets
reserved IP sometimes first free IP from range which isn't in the
reservation list.
I can't figure how to set this config to permanent stay on the same IP.

For example if myhost1 gets the right IP and that VM works about 10 days
and I need to reboot for some reason after reboot get another IP, that is
weird.
Or on an example I have baremetal server where I have virtualization and
there is my VM from myhost1 to myhost8, if I reboot baremetal after
booting, two VM get right IP, other not.

What wrong am I doing?
Thank you.


*—*

*Petar Kozić*
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