On 6/22/21 11:54 PM, Ed Greshko wrote:
[root@meimei ~]# nmap -sS -6 -p 2049 2001:b030:112f:2::53
Starting Nmap 7.80 ( https://nmap.org ) at 2021-06-23 14:47 CST
Nmap scan report for 2001:b030:112f:2::53
Host is up (0.00018s latency).
PORT STATE SERVICE
2049/tcp closed nfs
Means the firewall is not blocking the port but no service is
listening on that port
That's not entirely accurate. If the firewall action is REJECT rather
than DROP, you'll see the same output from nmap. "closed" can mean
either that the port is not open, or that the firewall is blocking
access with a REJECT action.
And nmap isn't necessary to establish this, since the logs already
provided included a "connection refused" response to the IPv6 mount attempt.
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