rfc3442-classless-static-routes 字段含义

参考文档：

https://www.nuomiphp.com/serverfault/zh/60480e758726d95932321906.html

# dhcp 配置
option rfc3442-classless-static-routes code 121 = array of integer 8;
option rfc3442-classless-static-routes 24, 192, 168, 1, 192, 168, 0, 4;
option ms-classless-static-routes code 249 = array of integer 8;
option ms-classless-static-routes 24, 192, 168, 1, 192, 168, 0, 4;

这将使用网关192.168.0.4分配网络192.168.1.0/24的路由条目。

字节的含义是（括号内为上例中的值）：

WW, D1, D2, D3, R1, R2, R3, R4
WW      = destination network mask width (24)
D1..D3  = destination network address (192.168.1.*)
R1..R4  = router address (192.168.0.4)

 注意：D1..DN字节数取决于网络掩码。有关详细信息，请参见RFC3442。