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Denying DHCP Request From Unauthorized Sources

I was wondering what how i could prevent unauthorized clients from broadcasting dhcp in my network. I have 2 authorized dhcp servers which i need to allow but i need to stop clients from pluggin their network connection into a lan port and broadcasting dhcp.  I have a cisco 2811 router
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v46n
Asked:
v46n
1 Solution
 
pkjesusCommented:
Hi,

It is a bit difficult to block these rogue DHCP servers, but if you also have a Cisco switch connected to the router, you may be able to use what's called "DHCP snooping."

Here are some references:

http://www.ciscopress.com/articles/article.asp?p=174313&seqNum=2

http://blog.ioshints.info/2009/03/blocking-rogue-dhcp-servers.html

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v46nAuthor Commented:
yea we have a cisco switch behind every router. i will look a the examples. thank you
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