cisco dhcp
dhcp 中继service dhcp
ip dhcp> ip routing
int vlan 1
ip helper-address XXXX
server
service dhcp
ip dhcp> ip dhcp pool pool
network 192.168.1.0 255.255.255.0
default-router 192.168.1.1
exit
ip dhcp excluded-address 192.168.1.1 192.168.1.30
交换网络中的DHCP***与防范
(1)DHCP server的冒充
(2)DHCP server的DoS***
(3)静态指定IP地址的问题
防范
(1)port security
switchport port-security maximun X(没有为一台)
switchport port-security mac-address sticky(粘,可静态绑)
switchport port-security violation {protect/restrict/shutdown}
(2)dhcp snooping
将交换机端口分为trust、untrust端口,交换机会侦听来自untrust端口的每个dhcp包的内容,untrust端
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