Re: Learning ipv6 quirks

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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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