[CentOS] nmap showing lots of ports open that shouldn't be

[Jim Perrin]

> Someone else suggested running netstat -a | grep LISTEN, and that
> indeed shows only services I would expect.

Also worth keeping in mind that it's getting more common for ISPs and
other providers to filter specific ports or answer for you. Most times
this shows up as "Filtered" in nmap, but anything's possible.

--
"They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety''
Benjamin Franklin 1775