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Forum Discussion
How do you close open ports?
I have been running port scans using nmaps and other software. It that shows there are 9 open ports.
If I use an online check to see if these ports are open they are reported as closed.
Should I be concerned about this?
Also my ISP has warned me about an open port 53 (DNS resover) and possible DoS.
Thank you
K
Netgear orbi
7 Replies
Open ports facing the internet (WAN side) are a concern.
Open ports on the LAN side are required for the router to function. Port 53 is DNS. Port 80 is http. Port 8443 is https. etc.
If you list the ports, perhaps people will notice one that is unusual.
When I do a port scan from one of the public scan sites, I believe it shows no ports: https://www.grc.com/x/ne.dll?bh0bkyd2
PORT STATE SERVICE
21/tcp filtered ftp
53/tcp open domain
80/tcp open http
443/tcp open https
631/tcp open ipp
3333/tcp open dec-notes
5555/tcp open freeciv
20005/tcp open btx
49152/tcp open unkn
I get this report if i run nmaps locally using my local ip number for my router (192.168.x.x)
All ports shown as 'stealth, when using shileds up.
Thank you
K
If 53 is not open, no device will be able to access the internet in any practical way. Port 80 is used to administer the Orbi.
Since these are all on the LAN side, I do not see these as an issue (although I will continue to look at them).
MUCH more interested in what Gibson says about from the WAN side (where the bad guys are).
