[Dnsmasq-discuss] Help with dnsmasq and vlans tags

[jmperrote]

El 2018-12-04 12:26, john doe escribió:
> On 12/4/2018 12:02 PM, jmperrote wrote:
>> El 2018-12-03 13:30, john doe escribió:
>>> 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, sorry for my mistake, my actual configuration of dnsmasq 
>> are:
>> 
>>     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:eth1,set:VLAN_137,10.11.137.90,10.11.137.98,6h
>>     dhcp-option=eth1,6,10.11.37.15 #dns primario
>>     dhcp-option=eth1,1,255.255.255.0 # mascara de red
>>     dhcp-option=eth1,option:router,10.11.137.1 # gateway
>> 
>>     dhcp-range=interface:eth2,set:VLAN_237,10.11.237.50,10.11.237.200,6h
>>     dhcp-option=eth2,6,10.11.37.15 #dns primario
>>     dhcp-option=eth2,1,255.255.255.0 # mascara de red
>>     dhcp-option=eth2,option:router,10.11.237.1 # gateway
>> 
>> We have 3 nics on the system eth0/eth1/eth2, one for each VLAN, and 
>> try
>> to replace for one nic with VLANs tagged.
>> 
>> We try the tag option and the dhcp assign ip on correct range for each
>> PC on each vlan, but dnsmasq allways assign to the PC the same 
>> gateway,
>> that is the las vlan configured.
>> 
>> For example on this configuraton assign the correct range to the PC, 
>> but
>> the gateway always assign 10.11.237.1 gateway, to all PC
>> 
>> dhcp-range=interface:eth0.37,set:VLAN_37,10.11.37.90,10.11.37.98,6h
>> dhcp-option=eth0.37,6,10.11.37.15 #dns primario
>> dhcp-option=eth0.37,1,255.255.255.0 # mascara de red
>> dhcp-option=eth0.37,option:router,10.11.37.1 # gateway
>> 
>> dhcp-range=interface:eth0.137,set:VLAN_137,10.11.137.90,10.11.137.98,6h
>> dhcp-option=eth0.137,6,10.11.37.15 #dns primario
>> dhcp-option=eth0.137,1,255.255.255.0 # mascara de red
>> dhcp-option=eth0.137,option:router,10.11.137.1 # gateway
>> 
>> dhcp-range=interface:eth0.237,set:VLAN_237,10.11.237.50,10.11.237.200,6h
>> dhcp-option=eth0.237,6,10.11.37.15 #dns primario
>> dhcp-option=eth0.237,1,255.255.255.0 # mascara de red
>> dhcp-option=eth0.237,option:router,10.11.237.1 # gateway
>> 
>> 
>> It is necessary to use "vconfig" to configure virtual vlan interface 
>> on
>> the operating system, or can use tagged vlans from the router ?
>> 
> 
> To be able to answer your question I need to know the following:
> 
>  - What hardware is the router (netgear, cisco ...)?
>  - What type of distribution (name and version) are you using 'vconfig'
> on (Linux, Oracle)?
> 
> I can't answer your question without knowing your network topology, but
> if the router is VLAN tagging capable I would use it and also use the
> DHCP capability from that router.
> 
> Also, to isolate whether it is a vlan configuration or a dnsmasq issue
> simply try the line I have provided, obviously you can change the Ip
> ranges to your liking.


Hello john doe,

Send the data:
  -- Router mikrotik RB1100 AH
  -- Ubuntu 16.04
  -- Using vconfig with 3 VLANs

Yes, the router have capabilitie to dhcp, you recommend to use that 
instead of dnsmasq for dhcp ?.

Regards.