router #1
	WAN: configured per your ISP
	LAN: 192.168.88.1/24
	static routes
		192.168.3.0/24 via 192.168.88.2
		192.168.11.0/24 via 192.168.88.2

router #2
	WAN: 192.168.88.2/24 gateway 192.168.88.1
	LAN: 192.168.3.1/24
	static routes
		192.168.11.0/24 via 192.168.3.2

router #3
	WAN: 192.168.3.2/24 gateway 192.168.3.1
	LAN: 192.168.11.1/24