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Newsgroups: fr.comp.os.linux.configuration,fr.comp.reseaux.ip
From: Lulu <lulu042@fry.fr.invalid>
Subject: regle iptables bizarre
Organization: koitess?
Followup-To: fr.comp.reseaux.ip
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Message-ID: <slrnsu5uhg.p8q.lulu042@valentino.Rock-n-Roll.org>
Date: Sat, 15 Jan 2022 17:45:36 +0100
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[ XP : fr.comp.os.linux.configuration,fr.comp.reseaux.ip, FU2 : fcri ]

Bonjour,

J'ai essayé, il y a plusieurs années, de comprendre via des tutos la
syntaxe et la philosophie d'iptables...
Mais j'y suis particulièrement hermétique et surtout je ne suis pas
administrateur réseau, donc je ne pratique pas tous les jours.

J'ai effectué un 'iptables-save' qui retourne ça :
8<-----------8<---------8<----------8<----------8<----------8<----------8<
# Generated by iptables-save v1.8.4 on Sat Jan 15 17:02:17 2022
*security
:INPUT ACCEPT [7021:3595205]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [6491:759337]
COMMIT
# Completed on Sat Jan 15 17:02:17 2022
# Generated by iptables-save v1.8.4 on Sat Jan 15 17:02:17 2022
*raw
:PREROUTING ACCEPT [7360:3655076]
:OUTPUT ACCEPT [6595:765420]
COMMIT
# Completed on Sat Jan 15 17:02:17 2022
# Generated by iptables-save v1.8.4 on Sat Jan 15 17:02:17 2022
*mangle
:PREROUTING ACCEPT [7360:3655076]
:INPUT ACCEPT [7360:3655076]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [6595:765420]
:POSTROUTING ACCEPT [6492:761240]
COMMIT
# Completed on Sat Jan 15 17:02:17 2022
# Generated by iptables-save v1.8.4 on Sat Jan 15 17:02:17 2022
*nat
:PREROUTING ACCEPT [0:0]
:INPUT ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
COMMIT
# Completed on Sat Jan 15 17:02:17 2022
# Generated by iptables-save v1.8.4 on Sat Jan 15 17:02:17 2022
*filter
:INPUT ACCEPT [2971:1696438]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [3274:299869]
-A INPUT -s 185.203.219.138/32 -i wlan0 -j ACCEPT
-A INPUT -i wlan0 -j DROP
-A OUTPUT -d 185.203.219.138/32 -o wlan0 -j ACCEPT
-A OUTPUT -o wlan0 -j DROP
COMMIT
# Completed on Sat Jan 15 17:02:17 2022
8<-----------8<---------8<----------8<----------8<----------8<----------8<

Est-ce qu'un expert des firewalls pourrait m'expliquer ce que ça fait ?
Et surtout ce que font les règles concernant la machine 185.203.219.138 ?

Sachant que mon adresse WAN est, selon mon-ip.com, 185.203.219.97 et que
j'utilise nordvpn en me connectant via un serveur à Chicago.

Merci de toute aide.