Install clash on asus router with stock firmware

1. Stick with stock firmware! No Asuswrt-Merlin, no KoolShare.
2. Need clash

This repo is barely a message to give you confidence that this is feaible.

https://github.com/gygy/asus_factory_image

https://github.com/RMerl/asuswrt-merlin/wiki/Disk-formatting

Download binary from https://github.com/Dreamacro/clash/releases, put it under usb disk.

Up to here, should be able to run clash on router.

Refer to start-clash.sh

iptables -t nat -A CLASH -p tcp --dport 15643 -j RETURN is meant to bypass clash for traffic to your proxy server, in my case all the servers are using port 15643 so the rule looks like this, you'll need to figure proper rule for your servers.
iptables -t nat -A CLASH -p tcp -j REDIRECT --to-ports 9090 is meant to redirect traffic to clash, so 9090 should be the port you configured in redir-port. iptables -t nat -A PREROUTING -p udp -m udp --dport 53 -j DNAT --to-destination 192.168.50.1:12358 is meant to let clash handle all dns traffic, 12358 needs to be aligned with the config in dns -> listen, if you don't have the DNS poisoning issue, you can remove this rule.

https://www.snbforums.com/threads/is-there-a-clear-guide-how-to-run-custom-scripts-on-stock-firmware.48512/

Refer to script_usbmount_hook.sh

Now, transparent proxy is enabled.

华硕，路由器，原生固件，原厂固件