netpractice/level4.json

{"routes":{},"ifs":{"A1":{"mask":"255.255.255.240"},"B1":{"ip":"123.235.115.131","mask":"255.255.255.240"},"R1":{"ip":"123.235.115.130","mask":"255.255.255.240"},"R2":{},"R3":{},"S1":{}}}