DHCP gives an IP when the DHCP relay is not in the subnet
perl-list
perl-list at network1.net
Thu Jan 5 18:42:08 UTC 2017
Without the bit about not giving an IP (or an IP from a different subnet) if the relay is 10.1.1.4, you could do it something like this:
shared-network SomeNetwork {
subnet 192.168.1.0 netmask 255.255.255.0 {
option routers 192.168.1.1;
option subnet-mask 255.255.255.0;
pool {
range 192.168.1.2 192.168.1.254;
}
}
subnet 10.1.1.0 netmask 255.255.255.0 {
}
}
which alerts the DHCP server that requests from 10.1.1.0/24 are in the same physical network as 192.168.1.0/24 and so it will pick a pool address from 192.168.1.2 - 192.168.1.254
as for how to not answer when 10.1.1.4 relays (or answer with a different subnet's IP), that is beyond my knowledge.
> From: "Mik J" <mikydevel at yahoo.fr>
> To: dhcp-users at lists.isc.org
> Sent: Thursday, January 5, 2017 12:36:58 PM
> Subject: DHCP gives an IP when the DHCP relay is not in the subnet
> Hello,
> Is it possible that the dhcp offers an IP but the dhcp relay is not in the
> subnet ?
> I have a vlan 192.168.1.0/24 and 3 dhcp relay. Each dhcp relay will use a
> loopback to relay the dhcp request 10.1.1.1 or 10.1.1.2 or 10.1.1.3. The client
> machines will receive an IP in 192.168.1.0/24
> Is it possible ?
> NB: if there's a DHCP relay in 10.1.1.4, I don't want to offer an IP in
> 192.168.1.0/24
> Do you have a link or keywords that would help to find the typical configuration
> for that
> Thank you
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> dhcp-users mailing list
> dhcp-users at lists.isc.org
> https://lists.isc.org/mailman/listinfo/dhcp-users
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