[Dnsmasq-discuss] dnsmasq not overriding leases for static assigments, by design

Geert Stappers stappers at stappers.nl
Sat May 15 15:36:42 UTC 2021

On Sat, May 15, 2021 at 12:38:16PM +0100, Jesus M Diaz wrote:
> Hello,

> I have a 'TP-Link One-Mesh' system at home formed by the main router and
> three satellite access-points. It works really well making a good coverage
> over the house with smooth change from one AP to the other, but it has a
> caveat: for DHCP requests, the AP change the client mac-address with a
> combination of the three last duplas from the own AP mac-addr and the last
> three ones from the client itself.
Why?  Long / verbose:  I wonder **why** the Acces Point makes that change.

> So, imagine my client mac-addr is A:B:C:D:E:F and my APs mac-addr are
> aN:bN:cN:dN:eN:fN, with N a number to identify the AP.
> If the client connects directly to the router, the dhcp request will come
> from A:B:C:D:E:F. But if it connects to one of the AP, the dhcp request
> will come from dN:eN:fN:D:E:F.
> This is not a problem for dynamic assignments (well, sometimes is for the
> name link in the dns part, but not critical).
> But when I have static leases the problems. I have defined dhcp-hosts
> entries with multiple mac-addr, something the documentations explain as:
> *As a special case, in DHCPv4, it is possible to include more than one
> > hardware address.
> > eg: --dhcp-host=11:22:33:44:55:66,12:34:56:78:90:12, This allows
> > an IP address to be associated with multiple hardware addresses, and gives
> > dnsmasq permission to abandon a DHCP lease to one of the hardware addresses
> > when another one asks for a lease.*
> But the reality is that when a second request comes, dnsmasq finds the IP
> is in used and assigns a new one from the global pool, instead of the
> static one.
> I have tried the configuration either using wildcards (*:*:*:D:E:F, given
> the last part of the mac-addr remains unchanged), but also defining each
> one of the possible cases
> (d1:e1:f1:D:E:F,d2:e2:f2:D:E:F,d3:e3:f3:D:E:F,A:B:C:D:E:F). Same outcome in
> both cases.
> Am I doing something wrong? Any idea how to fix this?

Changing the Access Point configuration???
Changing the Access Points???

> Thanks in advance.

Please keep us, this mailinglist (archive), posted.

Geert Stappers
Silence is hard to parse

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