Install OpenWRT on Proxmox

Prequisites

1. Download and extract OpenWRT image:

curl https://downloads.openwrt.org/releases/23.05.4/targets/x86/64/openwrt-23.05.4-x86-64-generic-ext4-combined-efi.img.gz -o /tmp/openwrt.img.gz

gzip -d /tmp/openwrt.img.gz

Install

1. Create an empty virtualmachine

No hdd, at least 2 interfaces, etc...

2. Add image to vm:

qm importdisk 100 /tmp/openwrt.img local-lvm

3. Start vm and open console

4. Set WAN and LAN interfaces:

uci set network.wan.device='eth0'
uci set network.wan.proto='static'
uci set network.wan.ipaddr=172.16.16.254
uci set network.wan.netmask='255.255.255.0'
uci set network.wan.gateway=172.16.16.1
uci set network.wan.dns=213.133.98.98

uci set network.lan.device='eth1'
uci set network.lan.ipaddr=10.0.0.254
uci set network.lan.netmask='255.255.255.0'

4. Allow access from WAN and edit default ports:

uci add firewall rule
uci set firewall.@rule[-1].name='Allow-Admin'
uci set firewall.@rule[-1].enabled='true'
uci set firewall.@rule[-1].src='wan'
uci set firewall.@rule[-1].proto='tcp'
uci set firewall.@rule[-1].dest_port='22 8080 40443'
uci set firewall.@rule[-1].target='ACCEPT'

sed -i 's/0.0.0.0:80/0.0.0.0:8080/' /etc/config/uhttpd
sed -i 's/\[::]:80/\[::]:8080/' /etc/config/uhttpd
sed -i 's/0.0.0.0:443/0.0.0.0:40443/' /etc/config/uhttpd
sed -i 's/\[::]:443/\[::]:40443/' /etc/config/uhttpd

uci commit firewall
uci commit network
reboot

Final steps

1. Add extra interfaces and firewall rules if you need them