endarona
asked on
ARP entries and server/router going awol.
I do some IT support in a local school where quite often the server or the router are no longer pingable, shares disappear and no one can print via the server. This doesn't last but has been wrecking my head for a few weeks.
The arp table on a pc that can no longer communicate with the server or router shows the wrong mac address for the server or router's ip address. On looking up the mac address, the mac address belongs to an Apple or HTC iphone forexample. The school's network is primarily wireless.
Would this be down to the students in the school assigning the server or router's ip address on their smartphones? Or could it be due to some fault in the unmanaged switches?
Your help is greatly appreciated.
Many thanks in advance,
Enda
The arp table on a pc that can no longer communicate with the server or router shows the wrong mac address for the server or router's ip address. On looking up the mac address, the mac address belongs to an Apple or HTC iphone forexample. The school's network is primarily wireless.
Would this be down to the students in the school assigning the server or router's ip address on their smartphones? Or could it be due to some fault in the unmanaged switches?
Your help is greatly appreciated.
Many thanks in advance,
Enda
IanTh
why aren't you using dhcp for wireless thats the normal way
ASKER
I am using DHCP but I have a suspicion that the students are manaully assigning the ip address of the server or router to their phones. That is my understanding of why the arp table shows an incorrect mac address associated with the server or router's ip address.
I dont understand how your students are using static tell them its against a policy in force and must use dhcp as they are breaking other essential services like servers shares etc
ASKER
Without knowing for sure, they are setting manual addresses on their phones to cause as much hassle as possible to the network. Again this is only my opinion but apart from the arp tables and being able to see what manufacturer of smartphone the mac addresses are, i have no way of tracking whose phone the mac addresses belong to.
ok I think iphone mac addresses start with 98:fe:94:x:x:x
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ASKER
Thanks for the input. Unfortunately the switches are unmanaged. I'm going to go in and try Mike Timmons suggestion as per this link to keep kids smartphones off the wireless network
http://social.technet.microsoft.com/Forums/en/w7itprosecurity/thread/c5900c75-c031-4e02-9350-df7cb65bce04
This all stems from the mess created by Windows 7 showing the wireless key.
http://social.technet.microsoft.com/Forums/en/w7itprosecurity/thread/c5900c75-c031-4e02-9350-df7cb65bce04
This all stems from the mess created by Windows 7 showing the wireless key.