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andybarker · 02-01-2006, 20:24

As Timewarrior said, because of the requirement of NAT if you have a router (after all, that is why it is called a router - it routes things using NAT / PAT) nothing could get into your LAN without the router being set up to forward specific ports to specific LAN IPs.

When a router says it has a firewall, this tends to mean things like handling DOS attacks, port scans, etc. These tend to be on the higher end routers.

However, because a router uses NAT it inherantly acts as a firewall to any packets coming in from the internet where there is no rule to forward that packet (how would the router know where to send a packet coming in when it comes in on an unconfigured port?)

02-01-2006, 20:24	#7
andybarker Inactive Join Date: Jan 2005 Posts: 42	Re: Can NTL see past a router? As Timewarrior said, because of the requirement of NAT if you have a router (after all, that is why it is called a router - it routes things using NAT / PAT) nothing could get into your LAN without the router being set up to forward specific ports to specific LAN IPs. When a router says it has a firewall, this tends to mean things like handling DOS attacks, port scans, etc. These tend to be on the higher end routers. However, because a router uses NAT it inherantly acts as a firewall to any packets coming in from the internet where there is no rule to forward that packet (how would the router know where to send a packet coming in when it comes in on an unconfigured port?)