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Ubuntu 20.04 false subnet per interface isc-dhcp-server

ng flag
Dr. Memory

This morning I have configure my interfaces

network:
    version: 2
    renderer: networkd
    ethernets:
        ens160:
          dhcpd4: true
          nameservers:
            addresses: [8.8.8.8,8.8.4.4]
        ens192:
          dhcpd4: false
          addresses: [192.168.0.1/24]
         ens224:
           dhcpd4: false
           addresses: [192.168.10.1/24]

And tried to configure my DHCP server:

subnet 192.168.0.0 netmask 255.255.255.0 {
    interface ens192;
    option domain-name "Tor.org";
    range 192.168.0.2 192.168.0.252;
    option routers 192.168.0.1;
    option domain-name-servers 192.168.0.1;
    option subnet-mask 255.255.255.0;
}


subnet 192.168.10.0 netmask 255.255.255.0 {
    interface ens224;
    option domain-name "Network.org";
    range 192.168.10.2 192.168.10.252;
    option routers 192.168.10.1;
    option domain-name-servers 192.168.10.1;
    option subnet-mask 255.255.255.0;
}

on /etc/default/isc-dhcp-server I add this: INTERFACESv4: "ens192 ens224"

However, any subnet return from the dhcp server is from: 192.168.0.0/24 and I have no idea why, so I checked dhcp manual:

""" Please note that the current implementation assumes clients only have a single network interface. A client with two network interfaces will see unpredictable behavior. This is considered a bug, and will be fixed in a later release. It may be helpful to enable the one-lease-per-client parameter so that roaming clients do not trigger this same behavior. """

Do you have any idea ?

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djdomi avatar
za flag
djdomi
i had similar issues and changed over to dnsmask since it had an easier Syntax. Maybe this might be a option for you?
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