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Jan
17
comment List all MAC addresses and their associated IP addresses in my local network (LAN)
I just did a quick test on my network, and arp is displaying only about 25% of the devices that exist. If the computer running arp hasn't received a packet from another device, it won't be on the arp list. I'd be interested in knowing more about the devices that nmap failed to detect on your network; there are ways to hide from nmap but I've found the default nmap scan pretty effective. That said, There's no failsafe answer because if a device isn't generating traffic and isn't answering requests, it is invisible-- but most devices will answer some type of request.
Jan
17
awarded  Critic
Jan
17
comment List all MAC addresses and their associated IP addresses in my local network (LAN)
I'm surprised by this answer. "arp" does not show a list of active MAC addresses on the local network. "arp" shows a list of MAC addresses corresponding to machines that have interacted with the machine it is being run on. If there has been no communication between the local machine and another machine on the network recently, that machine will not show up in the "arp" listing.
Jan
17
awarded  Supporter
Sep
30
awarded  Nice Answer
Mar
3
awarded  Editor
Mar
3
revised What are the risks of NOT using a firewall (home computer)?
added 76 characters in body
Mar
3
comment What are the risks of NOT using a firewall (home computer)?
Bottom line, while what you've said in your answer is generally true, there are a number of different situations that can place a computer that usually lives behind NAT at risk, and a host-based firewall helps with most of them. (See my answer). There's no good reason I can think of NOT to enable it.
Mar
3
comment What are the risks of NOT using a firewall (home computer)?
...or the host based firewall would have an exception because you want to USE it on the LAN, which would cause this problem. Sure, the person in that blog post made a couple of mistakes. But the point is that UPnP is a rarely-used router feature that can be a security "gotcha." You think you are enabling something on your LAN, and suddenly you've exposed it to the internet.
Mar
3
comment What are the risks of NOT using a firewall (home computer)?
That said, your host-based firewall probably doesn't help you in this scenario.
Mar
3
comment What are the risks of NOT using a firewall (home computer)?
Here's an example of how it can happen by accident: miket5au.blogspot.com/2011/03/beware-vnc-and-upnp.html Sometimes you want to desktop sharing on the LAN, but don't mean to enable it for the outside world.
Mar
3
awarded  Teacher
Mar
3
comment What are the risks of NOT using a firewall (home computer)?
Even on Windows, NAT protects against more threats than most people realize. But I just don't see a good reason NOT to use a firewall.
Mar
3
awarded  Autobiographer
Mar
3
answered What are the risks of NOT using a firewall (home computer)?