[selina]

I found this computer with wierd alphanumeric "name" within our network. I'm not sure if it's a mac address since this one has 15 digits... mac addresss should be 12, right??

the access is denied to this computer. we want to know which computer this is, if this is one of our computers or what.

thanks for your help!!

[office politics]

C:\>arp -a

Interface: 172.18.5.173 --- 0x2
Internet Address------Physical Address-------Type
172.18.1.1-------------00-0f-23-0b-ef-c1------dynamic
172.18.1.4-------------00-0b-cd-0e-ba-a5-----dynamic
172.18.1.8 00-b0-d0-21-4d-c2 dynamic
172.18.1.150 00-50-da-64-eb-3a dynamic
172.18.5.115 00-09-6b-00-c3-8a dynamic
172.18.5.245 00-01-03-26-69-9a dynamic

[selina]

well, that computer disappeared from the network....
do you know what could've caused this? should we be worried about our security?

[Ethereal_Dragon]

what kind of network is this? Home, or office?
what kind of infrastructure? cabled network, or wireless?

Where SPECIFICALLY did you see this other computer?