[Dnsmasq-discuss] clients getting wrong gateway

[Keith Lyons]

Hi Simon,

That is correct we are using dhcp-relay on our switches

My concern with removing them completely is that the devices will no longer
respond to ping, we use a Web based systems to send dat to them (they are
label printers) that depends on the device to be ping-able to send the
print jobs to them.

As for tagging - Are you saying i would be able to tag the correct gateway
to correspond with my Option 82 statements? below is part of my
dnsmasq.conf file



dhcp-circuitid=set:01_port_01,temp-2b.plant.ldn01:ge-0/0/12.0:pack1-5-302
dhcp-circuitid=set:02_port_02,temp-2b.plant.ldn01:ge-0/0/6.0:pack1-5-302
dhcp-circuitid=set:03_port_03,temp-2b.plant.ldn01:ge-0/0/2.0:pack1-5-302
dhcp-circuitid=set:04_port_04,temp-2b.plant.ldn01:ge-0/0/18.0:pack1-5-302
dhcp-circuitid=set:05_port_05,temp-2b.plant.ldn01:ge-0/0/9.0:pack1-5-302

dhcp-range=net:01_port_01,temp-2b.plant.ldn01:ge-0/0/12.0:pack1-5-302,10.192.4.11,10.192.4.11,255.255.255.0
dhcp-range=net:02_port_02,temp-2b.plant.ldn01:ge-0/0/6.0:pack1-5-302,10.192.4.21,10.192.4.21,255.255.255.0
dhcp-range=net:03_port_03,temp-2b.plant.ldn01:ge-0/0/2.0:pack1-5-302,10.192.4.31,10.192.4.31,255.255.255.0
dhcp-range=net:04_port_04,temp-2b.plant.ldn01:ge-0/0/18.0:pack1-5-302,10.192.4.41,10.192.4.41,255.255.255.0
dhcp-range=net:05_port_05,temp-2b.plant.ldn01:ge-0/0/9.0:pack1-5-302,10.192.4.51,10.192.4.51,255.255.255.0


Thanks!

On Wed, Jun 28, 2017 at 5:24 PM, Simon Kelley <simon at thekelleys.org.uk>
wrote:

> On 28/06/17 13:25, Keith Lyons wrote:
> > I have Dnsmasq configured for option 82 for three different subents:
> > 10.192.4.x, 10.192.5.x and 10.192.9.x, all of the clients get the proper
> > IP's as expected via the Option 82 statements, but the 10.192.5 and
> > 10.192.9.x clients are getting the Gateway for the 10.19.4.x subnet.
> >
> > We are using Juniper switches and they are setup for DHCP relay, and
> > only one nic on the dnsmasq instance. Dnsmasq is running on a Centos 7
> > virtual machine.
> >
> > For each subnet declared I am declaring the corresponding gateway like
> this:
> > dhcp-option=option:router,10.192.4.1
> > dhcp-option=option:router,10.192.5.1
> > dhcp-option=option:router,10.192.9.1
> >
> > Any insight on how to do this so that the clients each get the proper
> > gateway would be greatly appreciated.
> >
> > I can post the full conf file if that would be helpful
> >
> > Thanks,
> >
> > Keith
> >
>
> The solution might be a simple as removing the
> dhcp-option=option:router,....... lines completely. If the DHCP relay is
> running on the router (and it sounds like it is) then the defaults will
> just do the right thing.
>
>
> Failing that, you're going to need to learn about DHCP tags, and
> selecting the correct router option using tags set from the option 82 data.
>
>
>
> Cheers,
>
> Simon.
>
>
>
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