ip source-route ! ip dhcp excluded-address 192.0.2.1 192.0.2.2 ip dhcp excluded-address 192.0.2.10 192.0.2.254 //IP addresses exluded from DHCP scope// ! ip dhcp pool pool1 import all network 192.0.2.0 255.255.255.0 dns-server 192.0.2.10 192.0.2.11 domain-name cisco.com ...
The Cisco IOS DHCP relay agent will be enabled on an interface only when the ip helper-address is configured. This command enables the DHCP broadcast to be forwarded to the configured DHCP server. Information About the DHCP Relay Agent
Switch(Config)IpDhcpRelayInformation Option 第三步:设置VLAN IP地址: Switch(Config)>IntVlan2 Switch(Config-vlan)IpAddress192.168.2.1 255.255.255.0 Switch(Config-vlan)NoShut Switch(Config-vlan)>IntVlan3 Switch(Config-vlan)IpAddress192.168.3.1 255.255.255.0 ...
2F-NEW-ACC-SW-1(config)#ip dhcp snooping 2F-NEW-ACC-SW-1(config)# ip dhcp snooping vlan 24 2F-NEW-ACC-SW-1(config)# ip dhcp snooping vlan 25 2F-NEW-ACC-SW-1(config)#interface GigabitEthernet1/0/47 2F-NEW-ACC-SW-1(config-if)#ip dhcp snooping trust 2F-NEW-ACC-SW-1(config)...
The virtual interface is used to support mobility management, Dynamic Host Configuration Protocol (DHCP) relay, and embedded Layer 3 security such as guest web authentication. It also maintains the DNS gateway host name used by Layer 3 security and mobility managers to verify the ...
1在客户端设备和DHCP服务器不再同一广播域内的时候,中间设备即路有器(路有功能的设备)必须要能够转发这种广播包,具体到cisco的设备上,则启用ip helper-address命令,来实现这种中继。 2 DHCP服务器要给终端设备分配地址则需要掌握两个重要的信息,第一,该客户端设备所在网络的子网掩码,DHCP服务器依据子网掩码的信息...
Cisco DHCP SNOOPING 总结 在cisco网络环境下,boot request在经过了启用DHCP SNOOPING特性的设备上时,会在DHCP数据包中插入option 82的选项(具体见RFC3046) 这个时候,boot request中数据包中的gatewayipaddress:为全0,所以一旦dhcprelay 设备检测到这样的数据包,就会丢弃。
3. 当配置VRRP功能后,中继设备的网关在各VRRP备份组的IP地址之间切换。 配置举例: # interface Vlanif10 ip address 192.168.30.1 255.255.255.0 ip address 192.168.31.1 255.255.255.0 sub dhcp select relay dhcp relay server-ip 192.168.30.1 dhcp relay gateway-switch enable # ...
The Cisco ASA support dhcp-relay function. The below lab is demonstrated on GNS3, ASA version is ASAv961 2.Topology: !interface Ethernet0/0ip address 198.51.100.2 255.255.255.0!ip route 192.0.2.0 255.255.255.0 198.51.100.1 !ip dhcp excluded-address 192.0.2.1 192.0.2.2ip dhcp excluded-address...
ip dhcp relay information trusted ip address 192.168.3.1 255.255.255.0!ip forward-protocol nd!no ip http serverno ip http secure-server!S2交换机配置如下: HJSW#sh runBuilding configuration...Current configuration : 2836 bytes!! Last configuration change at 02:24:43 UTC Thu May 24 201...