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tl;dr: I don't know why port 2601 is open on my router, it seems sort of sketchy and I want to close it, unless someone reassuringly tells me that it's ok.
My network was being a little weird today, so I just did a real basic Nmap scan. I noticed a weird port was open, but filtered, on my Core (Port 2601). Here are the results for it:
Nmap scan report for norton.core (172.16.0.1)
Host is up (0.0021s latency).
Not shown: 993 closed ports
PORT STATE SERVICE
53/tcp open domain
80/tcp open http
81/tcp open hosts2-ns
82/tcp open xfer
83/tcp open mit-ml-dev
84/tcp open ctf
2601/tcp filtered zebra
I run scans every once in a while, but I don't think I've ever noticed this port being open before. When I google it, it seems like an older protocol that wouldn't really be useful for my network (just PCs, a tv, and an xbox). I don't have UPnP enabled, and I never intentionally opened the port either. I talked to a few of their chat support people but they've been pretty clueless, the first one didn't even know what Nmap was. He did, however, say that no ports should be open on my router, which is weird, but none of the people I asked could explain what port 2601 is, or why it was opened on my router, or how to close it.
Can anyone tell me:
1. how to open and close ports on my router itself? not just port forwarding to networked devices through the Core app(nothing shows up on that screen, so port 2601 isn't coming from there), but for the core itself. I'm not quite tech-savvy enough to know how to ssh into it without port 22 open, and trying to access it via IP address in a web browser is blocked.
or 2. if port 2601 is even something I should worry about? again, I'm not very tech savvy, but it seems like an outdated protocol that's just a vulnerability on my network.