45 lines
1.2 KiB
Bash
45 lines
1.2 KiB
Bash
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#!/bin/sh -e
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# IP forwarding and NAT rules
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# Default host IP
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HOST_IP=""
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# Parse command line argument for --host-ip
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for arg in "$@"; do
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case $arg in
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--host-ip=*)
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HOST_IP="${arg#*=}"
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shift
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;;
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*)
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echo "Unknown argument: $arg"
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exit 1
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;;
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esac
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done
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# If HOST_IP is not set, fetch the IP address of the eth0 interface
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if [ -z "$HOST_IP" ]; then
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HOST_IP=$(ip -4 addr show eth0 | grep -oP '(?<=inet\s)\d+(\.\d+){3}')
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if [ -z "$HOST_IP" ]; then
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echo "Error: Could not retrieve IP from eth0"
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exit 1
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fi
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echo "No --host-ip provided. Using eth0 IP: $HOST_IP"
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else
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echo "Using provided --host-ip: $HOST_IP"
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fi
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# Enable IP forwarding
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echo 1 > /proc/sys/net/ipv4/ip_forward
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# Set iptables rules for NAT and forwarding
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iptables -t nat -A POSTROUTING -s 2.2.2.0/24 -o eth0 -j MASQUERADE
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iptables -A FORWARD -i xbnet_router_1 -o eth0 -j ACCEPT
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iptables -A FORWARD -i eth0 -o xbnet_router_1 -m state --state RELATED,ESTABLISHED -j ACCEPT
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# Ensure the xbnet_router_1 interface has a default route through eth0
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ip route add default via $(ip -4 addr show eth0 | grep -oP '(?<=inet\s)\d+(\.\d+){3}') dev xbnet_router_1
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exit 0
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