適用於多個子網路的 Linux DHCP

Question

vlan10---->firewall----->linux dhcp server
vlan20---------↑

我有兩個vlan（vlan10和vlan20），我想使用Linux DHCP伺服器來集中指定IP位址。

在 fortigate 防火牆中，我使用 dhcp 中繼為客戶端取得 dhcp ip。

在linux dhcp伺服器中，我使用[host]部分來限制客戶端取得靜態IP並允許已知主機取得動態IP。

########## config start #########

subnet 192.168.10.0 netmask 255.255.255.0 {
option subnet-mask 255.255.255.0;
option broadcast-address 192.168.10.255;
option domain-name-servers 192.168.8.248,192.168.8.246;
option routers 192.168.10.1;
allow unknown-clients;
range 192.168.10.11 192.168.10.210;
}

subnet 192.168.20.0 netmask 255.255.255.0 {
option subnet-mask 255.255.255.0;
option broadcast-address 192.168.20.255;
option domain-name-servers 192.168.8.248,192.168.8.246;
option routers 192.168.20.1;
deny unknown-clients;
range 192.168.20.11 192.168.20.210;
}

host host1  {
       hardware ethernet 11:11:11:11:11:11;
       fixed-address 192.168.10.20;
}

host host2  {
       hardware ethernet 22:22:22:22:22:22;
       fixed-address 192.168.10.21;
}

host host3  {
       hardware ethernet 33:33:33:33:33:33;
       fixed-address 192.168.20.20;
}

host host4 {
       hardware ethernet 44:44:44:44:44:44;
}

########## config end #########

在此配置中，所有用戶端都可以從 vlan10 或 vlan20 取得 ip，但我希望 host4 只能在 vlan20 中取得動態 ip。

當host4連線到vlan10時，host4無法從dhcp伺服器取得任何IP位址。

如何修改配置？

Answer 1

雖然我目前無法測試這一點，並且可能需要對語法進行一些調整，您可以使用“群組”定義並列出 vlan10 和 vlan20 群組中的所有客戶端，但在 vlan10 檔案中，您告訴 host4“拒絕啟動；”應該這樣做。

我目前無法自己測試這一點，但也許值得一試？

https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Deployment_Guide/s1-dhcp-configuring-server.html#group https://www.daemon-systems.org/man/dhcpd.conf.5.html用於拒絕啟動

您可能還想查看“includes”指令是否有效，因此您可以執行以下操作：

dhcp.conf：

option domain-name-servers 192.168.8.248,192.168.8.246;
include "/etc/dhcp/vlan10.txt"
include "/etc/dhcp/vlan20.txt"

vlan10.txt

group {
subnet 192.168.10.0 netmask 255.255.255.0 { 
option subnet-mask 255.255.255.0;
option broadcast-address 192.168.10.255;
option routers 192.168.10.1;
allow unknown-clients;
range 192.168.10.11 192.168.10.210;
include "/etc/dhcp/vlan10.hosts.txt"
include "/etc/dhcp/vlan10.deny.hosts.txt"
 }
}

vlan20.txt

group {
subnet 192.168.20.0 netmask 255.255.255.0 {
option subnet-mask 255.255.255.0;
option broadcast-address 192.168.20.255;
option routers 192.168.20.1;
deny unknown-clients;
range 192.168.20.11 192.168.20.210;
include "/etc/dhcp/vlan10.hosts.txt"
include "/etc/dhcp/vlan20.hosts.txt"
 }
}

vlan10.hosts.txt

host host1 { hardware ethernet 11:11:11:11:11:11; fixed-address 192.168.10.20; }

host host2 { hardware ethernet 22:22:22:22:22:22; fixed-address 192.168.10.21; }

host host3 { hardware ethernet 33:33:33:33:33:33; fixed-address 192.168.20.20; }

vlan10.deny.hosts.txt

host host4 { hardware ethernet 44:44:44:44:44:44; deny booting; }

vlan20.hosts.txt

host host4 { hardware ethernet 44:44:44:44:44:44; }

Answer 2

也許創建一個與您的 host4 匹配的類別並添加一行“deny Members of 'yourClass';”在您的子網路配置中可以提供協助

一個例子 ：

class "raspberry"
{
    # match mac starting with b8:27:eb
    match if substring(hardware, 1, 3) = b8:27:eb;
}

subnet 192.168.10.0 netmask 255.255.254.0 {
    option routers 192.168.10.254;
    pool {
        range 192.168.10.11 192.168.10.210;
        deny members of "raspberry";
    }
}