I have broken up our company network into a couple of VLans.
1. VLan-1 = 192.168.1.X = Administrative VLan and Misclaneous Device Vlan.
a. Switches and Electrical/HVac panels
2. Servers VLan (not relevant here)
3. VLan-21 = 10.220.21.X = Windows Domain PC receiving DHCP.
a. DHCP Scope .55 - 254 for DHCP.
3. VLan-40 = 10.220.40.X = Wireless VLan = for Ipad and Wireless Cell phones (to receive email and internet).
My question is regarding our DHCP address. DHCP is woring just fine and has been woring for 3-Plus years now. However, I now have noticed that the Address leases (in teh VLan-21 DHCP SCope) are shwowing some android devices. It is if these android devices are getting IP Addresses for my VLan-21 Network. Please see screen shot.
My 1st question is why are these 'android' devices and 'Blank' devices showing up in the Address Leases? Is it because someone is connecting a "rouge" wireless router to an active 'VLan-21' jack and giving out connections that way?
When I connect my android device to my company wireless network(VLan-40), I can see my cell phone's wi-fi MAC address in the VLan-40 address leases. I do not see it in the VLan-21 address leases(that is what I would expect). What do you think is going on?