[Dnsmasq-discuss] Restrict DHCP providing default gateway to *one* host on one network

TJ dnsmasq at iam.tj
Wed Apr 24 08:58:59 BST 2013


On 23/04/13 15:33, Will Dennis (Live.com) wrote:
> interface=vl10-ovsbr0
> interface=vl20-ovsbr0
> bind-interfaces
> dhcp-range=vl10-ovsbr0,192.168.10.50,192.168.10.150,4h
> dhcp-range=vl20-ovsbr0,192.168.20.50,192.168.20.150,4h
> dhcp-host=52:54:00:d5:ee:4d,id:*,192.168.10.1
> dhcp-mac=set:wanem-20,52:54:00:45:8c:6a
> dhcp-option=vl10-ovsbr0,3,192.168.10.254
> dhcp-option=tag:vl20-ovsbr0,tag:!wanem-20,3,192.168.20.254
> log-dhcp

I may be mis-reading the manual but as I understood it dnsmasq will issue a default set of options for
each range.

dhcp-range=vl20-ovsbr0 will get a default option 3 which will be the IP of the host running dnsmasq

dhcp-mac=set:wanem-20 sets a tag for the exceptional client

dhcp-option=tag:vl20-ovsbr0,tag:!wanem-20 will set a (possibly different) gateway for non-exceptional clients.

At this point the exceptional client will have the default option 3 for the range. I think what you need is to not send any default route at all when the exceptional client makes a request:

dhcp-option=tag:vl20-ovsbr0,tag:wanem-20,3



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