# You can declare a class of clients and then do address allocation
# based on that. The example below shows a case where all clients
# in a certain class get addresses on the 10.17.224/24 subnet, and all
# other clients get addresses on the 10.0.29/24 subnet.

#class "foo" {
# match if substring (option vendor-class-identifier, 0, 4) = "SUNW";
#}

#shared-network 224-29 {
# subnet 10.17.224.0 netmask 255.255.255.0 {
# option routers rtr-224.example.org;
# }
# subnet 10.0.29.0 netmask 255.255.255.0 {
# option routers rtr-29.example.org;
# }
# pool {
# allow members of "foo";
# range 10.17.224.10 10.17.224.250;
# }
# pool {
# deny members of "foo";
# range 10.0.29.10 10.0.29.230;
# }

match if substring (option vendor-class-identifier, 0, 4) = "SUNW";中的 0, 4所代表的含义是什么，一直分不到想要的IP，估计是这两个参数理解错误了，哪位大神知道啊，求解....

https://linux.die.net/man/5/dhcp-options
dhcp-options - Dynamic Host Configuration Protocol options
使用關鍵字 搜尋
vendor-class-identifier
VENDOR ENCAPSULATED OPTIONS

还想请问以下，如果我要在DHCP启动之后，给我的client 通过自己建立的TFTP server分配一个文件，我在DHCP文档中添加了文档的名字，但是一直识别不了，是不是还要添加此文档的路径在DHCP conf中？但是我不知道添加这个文件及文件路径的规则？急求？大神。

1. 不是很清楚你這裡的 文档 跟上面的 文件 有沒有關聯

1-1. 猜測 也許 你把 dhcp 的功能 跟 ftp 的功能 混在一起了
1-1-1. DHCP
https://help.ubuntu.com/lts/serverguide/dhcp.html
1-1-2. FTP Server
https://help.ubuntu.com/16.04/servergui ... erver.html