[Dnsmasq-discuss] How to pin IP range on an interface?

Geert Stappers stappers at stappers.nl
Tue Nov 5 21:31:18 GMT 2019


On Tue, Nov 05, 2019 at 01:26:55PM -0600, Lonnie Abelbeck wrote:
> > On Nov 5, 2019, at 12:39 PM, bln 77 <bln_77 at yahoo.de> wrote:
> > 
> > Hi everyone,
> > 
> > I have a 10.1.0.0/16 network.
> > I want to have clients in the same network because I want to be able to receive IP-broadcast for autodiscovery.
> > I configured two VLANs and the router has an interface/ip in both:
> > lan1: 10.1.1.0 with subnet mask 255.255.0.0
> > lan2: 10.1.2.0 with subnet mask 255.255.0.0
> > 
> > Both interfaces are bridged together and I filter/firewall the traffic with etables rules.
> > I have a filter that blocks DHCP traffic from being bridged/forwarded.
> > 
> > Now I want to configure dnsmasq to offer the following ranges on the interfaces so I can easily recognise in which net the client belongs:
> > 
> > dhcp-range=set:lan1,10.1.1.50,10.1.2.199,255.255.0.0,12h
> > dhcp-range=set:lan2,10.1.2.50,10.1.3.199,255.255.0.0,12h
> > 
> > Unfortunately the clients on the second interface also getting an offer from the 10.1.1.x range.
> > 
> > I think both ranges are active on both interfaces?
> > 
> > Is there any way to pin a range to an interface?
> > 
> > Any help is appreciated.
> 
> Alternatively, use isolated subnets with 255.255.255.0 masks, no bridge, and enable "avahi-daemon" to share the broadcasts you need between subnets.
> 
> Everything is now simple ... except possibly configuring "avahi-daemon". :-)
> 

Here another person that doesn't understand the use case of O.P.

But I think the question is
> > Is there any way to pin a range to an interface?


Two snippets from http://thekelleys.org.uk/dnsmasq/docs/dnsmasq-man.html

1: The tag "bootp" is set for BOOTP requests, and a tag whose name is the
   name of the interface on which the request arrived is also set.

2: --dhcp-range=[tag:<tag>[,tag:<tag>],][set:<tag>,]<start-addr>
     [,<end-addr>|<mode>][,<netmask>[,<broadcast>]][,<lease time>]


Let us, this mailinglist, know how helpfull this posting was.


Groeten
Geert Stappers
-- 
Leven en laten leven



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