Dynamic DHCP but need to skip few mac addresses

Installing and Using OpenWrt Network and Wireless Configuration
1

Dear Friends,

I have this scenario where all my clients get IP address via DHCP, however, I want to ignore / skip few mac addresses when it comes to leasing them an IP.

Static leases won't be an answer as I have 200 + clients and this is a requirement for 10 - 20 hosts.

Best Regards,

2

What is your goal? You want the DHCP server to ignore the request of certain clients? Then why connect them to your network at all?

3

The hosts have 2 NICs, I want the DHCP to ignore for the second NIC while staying on the same segment.

4

Well, then the same question. Why connect that 2nd NIC? When it doesn't get an IP address, and is not somehow bonded (in which case it should ask only a single IP), it has no function in your network.

5

I know I had this on vanilla dnsmasq running. But I don't know if luci/dnsmasq is supporting it:

dhcp-host=xx:xx:xx:xx:xx:xx,ignore

Maybe you have to circumvent openwrt's dnsmasq implementation.

EDIT:

http://www.thekelleys.org.uk/dnsmasq/docs/dnsmasq-man.html

-G, --dhcp-host=[][,id:<client_id>|*][,set:][tag:][,][,][,<lease_time>][,ignore]

EDIT 2:

Well a problem would be IPv6. Because on OpenWrt it's managed by odhcp6 and in addition to that the manpage of dnsmasq is inicating:

"Note that in IPv6 DHCP, the hardware address may not be available, though it normally is for direct-connected clients, or clients using DHCP relays which support RFC 6939"

So for todays infrastructure with IPv6 this is probably not an option anymore.

Only client-side solutions left (probably). :confused:

6

Well, I understand where you are coming from but it is not a design thing at the moment and not relevant.

Question was simple actually that if there is a feature / method that could allow dhcp to skip for certain hosts. I was going through different ignore options within openwrt but couldn't find any. @pwned, I don't think it may work here, I will check and see though.