feat: part 1 finished and seemingly working

report/report.qmd

+---
+title: Equipements réseaux virtuels basé sur les namespaces Linux
+subtitle: ISC_S612
+author:
+    - Iliya Saroukhanian
+lang: fr-CH
+date: today
+date-format: long
+format:
+    pdf:
+        documentclass: scrreprt
+        papersize: a4
+        lof: true
+        highlight-style: github
+        toc: true
+        number-sections: true
+        colorlinks: true
+---
+
+# Topologie
+
+## Préparation du routeur
+
+```bash
+#!/usr/bin/env bash
+
+echo "======= R1: Activating IP forwarding ======="
+ssh R1 "echo 1 > /proc/sys/net/ipv4/ip_forward"
+sleep 1
+
+echo "======= R1: Obtaining IP for eth0 ======="
+ssh R1 dhclient -v eth0
+
+echo "======= R1: Setting up static 10.0.0.2/24 IP for eth1 ======="
+ssh H1 ip addr add 10.0.0.1/24 dev eth0
+sleep 1
+ssh H1 ip link set up dev eth0
+sleep 1
+
+echo "======= R1: Setting up static 10.0.0.2/24 IP for eth1 ======="
+ssh R1 ip addr add 10.0.0.2/24 dev eth1
+sleep 1
+ssh R1 ip link set up dev eth1
+sleep 1
+
+echo "======= H1: Setting default route via R1 (i.e. 10.0.0.2) ======="
+ssh H1 ip route add default via 10.0.0.2
+sleep 1
+
+echo "======= H1 and R1: Installing tcpdump ======="
+ssh H1 apt install -y tcpdump
+sleep 1
+
+ssh R1 apt install -y tcpdump
+sleep 1
+
+echo "======= R1: Implementing NAT gateway ======="
+scp ./r1_nat.ruleset root@R1:/root
+sleep 1
+ssh R1 chmod +x ./r1_nat.ruleset
+sleep 1
+ssh R1 ./r1_nat.ruleset
+sleep 1
+```

scripts/prep.sh

+#!/usr/bin/env bash
+
+echo "======= R1: Activating IP forwarding ======="
+ssh R1 "echo 1 > /proc/sys/net/ipv4/ip_forward"
+sleep 1
+
+echo "======= R1: Obtaining IP for eth0 ======="
+ssh R1 dhclient -v eth0
+
+echo "======= R1: Setting up static 10.0.0.2/24 IP for eth1 ======="
+ssh H1 ip addr add 10.0.0.1/24 dev eth0
+sleep 1
+ssh H1 ip link set up dev eth0
+sleep 1
+
+echo "======= R1: Setting up static 10.0.0.2/24 IP for eth1 ======="
+ssh R1 ip addr add 10.0.0.2/24 dev eth1
+sleep 1
+ssh R1 ip link set up dev eth1
+sleep 1
+
+echo "======= H1: Setting default route via R1 (i.e. 10.0.0.2) ======="
+ssh H1 ip route add default via 10.0.0.2
+sleep 1
+
+echo "======= H1 and R1: Installing tcpdump ======="
+ssh H1 apt install -y tcpdump
+sleep 1
+
+ssh R1 apt install -y tcpdump
+sleep 1
+
+echo "======= R1: Implementing NAT gateway ======="
+scp ./r1_nat.ruleset root@R1:/root
+sleep 1
+ssh R1 chmod +x ./r1_nat.ruleset
+sleep 1
+ssh R1 ./r1_nat.ruleset
+sleep 1

scripts/r1_nat.ruleset

+#!/usr/sbin/nft -f
+
+flush ruleset
+
+table ip nat {
+    chain masq {
+        type nat hook postrouting priority 100;
+        oifname "eth0" counter masquerade
+    }
+}