windows預設閘道器設定錯誤

今天跟蹤網路，發現一臺機器發的包很奇怪.

09:56:18.774896 00:0b:00:03:4d:e9 > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 101: IP 192.168.4.26.1045 > 192.168.100.xx.3389: P 12319:12366(47) ack 57831 win 31962
09:56:18.779737 00:0f:e2:5a:7c:dd > 00:13:72:68:09:2a, ethertype IPv4 (0x0800), length 100: IP 192.168.4.26.1045 > 192.168.100.xx.3389: P 12217:12263(46) ack 57730 win 32063

發現mac地址什麼會出現 ff:ff:ff:ff:ff:ff, 仔細檢查機器網路配置才發現
原來是192.168.4.26機器的閘道器設定錯誤！寫成了192.168.4.255！

而找來一臺linux機器測試，發現會報錯：
# route add default gw 192.168.xxx.255
SIOCADDRT: Network is unreachable

windows簡直是垃圾中的垃圾！