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Open Ports

post #1 of 6
Thread Starter 
What does the phrase mean exactly? What I have in mind is that it's not protected by firewalls and so it's dangerous to have open ports. Is this correct?
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post #2 of 6
You are correct, if a port is "open" it means that the firewall will pass traffic along through that port. That is of course if the source or destination does not prohibit the traffic.

An ideal firewall review is as follows:

ACL permit/deny protocol source(ideally 1 host or small subnet) destination (ideally 1 host or small subnet) service(port number) log
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post #3 of 6
Thread Starter 
Quote:
Originally Posted by RooneyTunes View Post

You are correct, if a port is "open" it means that the firewall will pass traffic along through that port. That is of course if the source or destination does not prohibit the traffic.
An ideal firewall review is as follows:
ACL permit/deny protocol source(ideally 1 host or small subnet) destination (ideally 1 host or small subnet) service(port number) log

Is this any different to port forwarding?
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post #4 of 6
port forwarding is when youy send a specific port on the outside to a specific port on the inside a open port is one which is facing the internet/intranet which people can access say port 80/443 on a webserver


Open ports can be vunerable if you have to many, they can lead to ods fingerprinting / data leakage so it best to filter them
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post #5 of 6
Thread Starter 
I see thanks for the info
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post #6 of 6
A port is simply a channel for communication. An 'Open Port' has an active service running that is listening for connections.

Port forwarding exists in NAT/PAT environments such as a typical home setup.
As all of the LAN clients share a singular WAN IP, you must tell the router which LAN client to send any incoming requests toward this WAN IP from other WAN traffic. Your router automatically does this for outbound connections as it can tell which device originated the request by it's unique LAN IP.
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