[Dnsmasq-discuss] Simplest working "shared-network" configuration? (was Re: dnsmasq on an IPv4 /32 interface)

john doe johndoe65534 at mail.com
Sat Jul 10 18:25:56 UTC 2021

On 7/10/2021 9:57 AM, Paul Gear via Dnsmasq-discuss wrote:
> On 10/7/21 5:13 pm, john doe wrote:
>> On 7/10/2021 7:58 AM, Paul Gear via Dnsmasq-discuss wrote:
>>> Hi all,
>>> It's been a while since I originally posted about this, and I've done a
>>> lot of experimenting without landing on a working setup.
>>> I'm trying to get a very simple test case working, where I have a number
>>> of vnet interfaces, all configured with the link-local address
>>>, and have dnsmasq allocate the leases out of a different
>>> range (in this case, I'm using a portion of the documentation prefix,
>>>  Here's my configuration:
>>> pid-file=/var/lib/dnsmasq-vnet/dnsmasq-vnet.pid
>>> bind-dynamic
>>> interface=vnet*
>>> log-dhcp
>>> no-hosts
>>> dhcp-range=,, 1d
>> From (1):
>> " this dhcp-range MUST include the netmask."
>> Unless I'm missing something, I don't see a subnet mask being specified.
>> 1)  https://thekelleys.org.uk/dnsmasq/docs/dnsmasq-man.html
> Hi John,
> Unless I'm missing something is a netmask, and dnsmasq
> doesn't appear to support CIDR notation in dhcp-range specifications. At
> least, when I attempt to use /29 instead, it fails to start, saying:

I should have said, 'I don't see a subnet mask being specified in the
correct column' (sorry about that).

Still according to the same man page:


> dnsmasq: bad dhcp-range at line 41 of /var/lib/dnsmasq-vnet/dnsmasq.conf

The mask is specified as an 'end-range'.

John Doe

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