[Dnsmasq-discuss] Request for brain-storm: Rogue dhcp-servers
on the lan
Simon Kelley
simon at thekelleys.org.uk
Thu Aug 21 15:03:46 BST 2008
Rune Kock wrote:
> I know this is a bit off topic, but maybe someone on the list has some
> thoughts on this:
>
> I'm running a router for a group of people connected by lan. And I
> use a dhcp-server (dnsmasq) on the router to configure the clients.
>
> But increasingly often, someone has connected another router to the
> lan, usually to use it as a wifi access point. And since they don't
> know what they are doing, they connect their own router's lan-port to
> the big lan instead of using the wan-port. And so we get a wrong
> dhcp-server competing with dnsmasq.
>
> Every time this happens, I have to track down the rogue router by
> testing each cable of the lan. Quite time consuming, and until I get
> it done, the network is very unstable for the users.
>
> Does anyone have some ideas as how to mitigate this problem?
Talking to the network guys of my aquaintance, it's not an easy problem
to fix unless you have enterprise-grade networking kit.
You could try something which broadcasts a DHCPDISCOVER packet, that
should give you replies from every DHCP server on the net, with their IP
addresses.
Cheers,
Simon.
>
>
> Rune
>
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