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I'm likely showing my ignorance here, but would you be able to track
down the right port on a switch by using using the MAC address of the
DHCPDISCOVER response and the spanning tree protocol? (RSTP). I don't
know of any host-based software that does such a thing, though. How
complex is the switch topology we're talking about?<br>
<br>
Another possibility is to get a switch that does support SNMP (i.e.
'enterprise grade'). They used to be hideously expensive, but there's
now 'mid-level' products with simple web-based UIs and SNMP support
that aren't too bad. I'm using a Dell Powerconnect 2716 at home, for
example - about US$320 for a 16 port gigabit ethernet switch with a
pretty rich feature set.<br>
<br>
Paul<br>
<br>
Simon Kelley wrote:
<blockquote cite="mid:48AD75C2.9070004@thekelleys.org.uk" type="cite">
<pre wrap="">Rune Kock wrote:
</pre>
<blockquote type="cite">
<pre wrap="">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?
</pre>
</blockquote>
<pre wrap=""><!---->
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.
</pre>
<blockquote type="cite">
<pre wrap="">
Rune
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<pre wrap=""><!---->
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