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Add dhcp-ignore-clid configuration option

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The idea of this option was already discussed years ago on the mailing
list:
https://dnsmasq-discuss.thekelleys.org.narkive.com/ZoFQNaGo/always-ignore-client-identifier#post4

In our production environnement, we discovered that some devices are
using 'client identifier' not unique at all, resulting on IP addresses
conflicts between several devices (we saw up to four devices using same
IP address).

The root cause is probably a buggy operating system/configuration of
decices, but this patch add a configuration workaround on server side
when fixing clients is impossible.

Signed-off-by: Charles Daymand <charles.daymand@wifirst.fr>
Signed-off-by: Florent Fourcot <florent.fourcot@wifirst.fr>
This commit is contained in:
Florent Fourcot
2019-06-20 10:26:40 +02:00
committed by Simon Kelley
parent 19b0e3bf21
commit 13a58f9590
6 changed files with 23 additions and 3 deletions
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6
man/dnsmasq.8
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@@ -1405,6 +1405,12 @@ address, and setting this flag enables this mode. Note that in the
sequential mode, clients which allow a lease to expire are much more
likely to move IP address; for this reason it should not be generally used.
.TP
.B --dhcp-ignore-clid
Dnsmasq is reading 'client identifier' (RFC 2131) option sent by clients
(if available) to identify clients. This allow to serve same IP address
for a host using several interfaces. Use this option to disable 'client identifier'
reading, i.e. to always identify a host using the MAC address.
.TP
.B --pxe-service=[tag:<tag>,]<CSA>,<menu text>[,<basename>|<bootservicetype>][,<server address>|<server_name>]
Most uses of PXE boot-ROMS simply allow the PXE
system to obtain an IP address and then download the file specified by