Re: mysterious/suspicious internet activity.

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On 04/12/2020 10:51, home user wrote:
J. Witvliet responded to my original post, but his response showed up in the list as a new thread.  I'm responding here.

(on Dec. 01, 2020 at 02:35am US mountain time, J. Witvliet wrote)
What puzzles me, is that you don’t refer to the firewall.
It’s the firewall responsibility to block unexpected incoming, but also outgoing traffic.
Often people trust all outgoing traffic on 443 and 80 (and corresponding replies),
but you can initially LOG it all, and subsequently change your rules to DROP
all you don’t want to see. (Before logging the uncaught)
Please suggest what commands to run to check that what should be blocked is blocked.  We already do know that sshd is blocked.


I believe the firewall on your system is already dropping all incoming connection requests.

Provide the output of....

sudo firewall-cmd --get-active-zones

and then using the result from that command

sudo firewall-cmd --info-zone=whatever-was returned.

Example....

[egreshko@f32k ~]$ sudo firewall-cmd --get-active-zones
public
  interfaces: enp1s0

[egreshko@f32k ~]$ sudo firewall-cmd --info-zone=public
public (active)
  target: default
  icmp-block-inversion: no
  interfaces: enp1s0
  sources:
  services: dhcpv6-client mdns mountd nfs nfs3 rpc-bind ssh
  ports:
  protocols:
  masquerade: no
  forward-ports:
  source-ports:
  icmp-blocks:
  rich rules:

---
The key to getting good answers is to ask good questions.

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