On 12/3/2018 4:27 PM, jmperrote wrote:
> We need help to configure dnsmasq with vlans tagged on router.
> 
> We actually have a dnsmasq server serving dns and dhcp, and 3 nics, one
> for each vlans:
> 
> dhcp-range=interface:eth0,set:VLAN_37,10.11.37.50,10.11.37.200,6h
> dhcp-option=eth0,6,10.11.37.15 #dns primario
> dhcp-option=eth0,1,255.255.255.0 # mascara de red
> dhcp-option=eth0,option:router,10.11.37.1 # gateway
> 
> dhcp-range=interface:eth0,set:VLAN_137,10.11.137.90,10.11.137.98,6h
> dhcp-option=eth0,6,10.11.37.15 #dns primario
> dhcp-option=eth0,1,255.255.255.0 # mascara de red
> dhcp-option=eth0,option:router,10.11.137.1 # gateway
> 
> dhcp-range=interface:eth0,set:VLAN_237,10.11.237.50,10.11.237.200,6h
> dhcp-option=eth0,6,10.11.37.15 #dns primario
> dhcp-option=eth0,1,255.255.255.0 # mascara de red
> dhcp-option=eth0,option:router,10.11.237.1 # gateway
> 
> 
> Know we are migratting to a dnsmasq solution with one nic a tagged
> vlans: But the result is not that we want:
> 
> We configure this:
> 
> dhcp-range=tag:vlan37,set:VLAN_37,10.11.37.50,10.11.37.200,6h
> dhcp-range=tag:vlan137,set:VLAN_137,10.11.137.50,10.11.137.200,6h
> dhcp-range=tag:vlan237,set:VLAN_237,10.11.237.50,10.11.237.200,6h
> dhcp-option=tag:vlan37,option:dns-server,10.11.37.15
> dhcp-option=tag:vlan137,option:dns-server,10.11.37.15
> dhcp-option=tag:vlan237,option:dns-server,10.11.37.15
> dhcp-option=tag:vlan137,option:router,10.11.137.1
> dhcp-option=tag:vlan37,option:router,10.11.37.1
> dhcp-option=tag:vlan237,option:router,10.11.237.1
> 
> But all clients recive allways the same gateway, 10.11.237.1
> 

I'm not sure to fully understand the issue(s) you are facing.
As far as dnsmasq is concerned, there is no differences between 3
physical "nicks" and 3 VLAN tagged interfaces  (802.1Q).
So for a start you could simply try:

# Specify DHCP range with a tag
dhcp-range=set:vlan99,172.23.100.200,172.23.100.230,12h
dhcp-range=set:vlan100,172.23.101.200,172.23.101.230,12h
dhcp-range=set:vlan100,172.23.102.200,172.23.102.230,12h

-- 
John Doe

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