feat: bridge script working

scripts/bridge.sh

+#!/usr/bin/env bash
+
+echo "======= R1: Creating ns2 namespace ======="
+ssh R1 ip netns add ns2
+
+echo "======= R2: Activating IP forwarding ======="
+ssh R1 ip netns exec ns2 sysctl net.ipv4.ip_forward=1
+
+echo "======= R1: Creating veth pair (for veth0 and veth1) and moving them to ns2 ======="
+ssh R1 ip link add default-veth1 type veth peer name ns2-veth1 netns ns2
+ssh R1 ip link add default-veth0 type veth peer name ns2-veth0 netns ns2
+
+echo "======= R1: Creating and upping br1 bridge ======="
+ssh R1 ip link add name br1 type bridge
+ssh R1 ip link set dev br1 up
+
+echo "======= R1: Connecting and upping default-veth1 to br1 ======="
+ssh R1 ip link set default-veth1 master br1
+ssh R1 ip link set dev default-veth1 up
+
+echo "======= R1: Connecting and upping eth1 to br1 ======="
+ssh R1 ip link set eth1 master br1
+ssh R1 ip link set dev eth1 up
+
+echo "======= R1: Creating and upping br0 bridge ======="
+ssh R1 ip link add name br0 type bridge
+ssh R1 ip link set dev br0 up
+
+echo "======= R1: Connecting and upping default-veth1 to br1 ======="
+ssh R1 ip link set default-veth0 master br0
+ssh R1 ip link set dev default-veth0 up
+
+echo "======= R1: Connecting and upping eth0 to br0 ======="
+ssh R1 ip link set eth0 master br0
+ssh R1 ip link set dev eth0 up
+
+echo "======= R2: Upping the veths in ns2 ======="
+ssh R1 ip netns exec ns2 ip link set dev ns2-veth0 up
+ssh R1 ip netns exec ns2 ip link set dev ns2-veth1 up
+
+echo "======= R2: Obtaining IP for ns2-veth0 via DHCP ======="
+ssh R1 ip netns exec ns2 dhclient -v ns2-veth0
+
+echo "======= R2: Configuring static 10.0.0.2 IP for ns2-veth1 ======="
+ssh R1 ip netns exec ns2 ip addr add 10.0.0.2/24 dev ns2-veth1
+
+echo "======= R2: Implementing NAT inside ns2 ======"
+scp ./r2_nat.ruleset root@R1:/root
+ssh R1 ip netns exec ns2 nft -f ./r2_nat.ruleset
+
+echo "======= H1: Setting up static 10.0.0.1/24 IP for eth0 ======="
+ssh H1 ip addr add 10.0.0.1/24 dev eth0
+ssh H1 ip link set dev eth0 up
+
+echo "======= H1: Setting default route via R1 (i.e. 10.0.0.2) ======="
+ssh H1 ip route add default via 10.0.0.2