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Hunting down rogue DHCP servers as well as allowing them.
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Upon coming back from a nice break from work, we ended up having issues with a Rogue DHCP server spewing out 192.168.x.x addresses on our student VLAN. The way our network is setup right now is that we are allowing any and all traffic over our employee VLAN and our student VLAN. Yes we have plans to clamp this down to truly segment the traffic but this led me to ask the question to the listserv on how do people deal with the rogue DHCP servers? Also, do you have a plan in place that allows students to have a WAP on the student VLAN without any disruption to the other students’ network access?
So the tl;dr :
- How do you address/find/monitor for rogue DHCP servers?
- How do you deal with them once found? (Like best troubleshooting steps once the MAC address is found)
- How do you allow or disallow NAT’ed WAP’s interference with normal network operations?
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