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You can also do a live scan of the external IP address of this router at grc.com. That is another helpful source.
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You can also do a live scan of the external IP address of this router at grc.com. That is another helpful source.

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I need a good free software that will scan the ports of our ISP router. They are claiming certain ports are open but I think they are closed. Any suggestions and how to would be helpful.
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I need a good free software that will scan the ports of our ISP router. They are claiming certain ports are open but I think they are closed. Any suggestions and how to would be helpful.

What is a good software to check the ports on our router?

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.

Routers

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.

Networking

Hardware-based firewalls provide more sophisticated protection for inbound and outbound traffic than the simple Windows software firewall or the basic NAT firewalls found in routers. These devices implement techniques such as stateful packet inspection, deep packet inspection, and content filtering; and may include built-in antivirus and anti-malware protection.