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- #!/bin/bash
- set -e
- gateway_ip=$(ip route show default | awk '/default/ {print $3}')
- eth1_ip=$(ip addr show eth1 | grep "inet\b" | awk '{print $2}' | cut -d/ -f1)
- echo "Configuring secondary IP (eth1) ..."
- # Print stuff
- echo "Gateway IP: ${gateway_ip}"
- echo "Secondary IP: ${eth1_ip}"
- # Enable DHCP autoconfiguration
- if ! grep -q "auto eth1" /etc/network/interfaces; then
- sed -i '/auto eth0/a auto eth1' /etc/network/interfaces
- echo ".. dhcp autoconfigure enabled"
- else
- echo ".. dhcp autoconfigure already enabled, skipping"
- fi
- # Restart networking service
- echo ".. restarting network service"
- service networking restart
- # Add an entry to the route table
- if ! grep -q "eth1_rt" /etc/iproute2/rt_tables; then
- echo "2 eth1_rt" >> /etc/iproute2/rt_tables
- echo ".. route table entry added"
- else
- echo ".. route table entry exists, skipping"
- fi
- # Add the default route for eth1
- if ! ip route list table eth1_rt 2>/dev/null | grep -q ${gateway_ip}; then
- ip route add default via ${gateway_ip} dev eth1 table eth1_rt
- echo ".. default route added"
- else
- echo ".. default route exists, skipping"
- fi
- # Add rule to route traffic with a source of "eth1_ip" to the eth1 route table
- if ! ip rule show | grep -q ${eth1_ip}; then
- ip rule add from ${eth1_ip} lookup eth1_rt prio 1000
- echo ".. ip rule added"
- else
- echo ".. ip rule exists, skipping"
- fi
- echo "Configuration complete!"
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