网络基础wlan第4章dhcpn手动为局域网中大量主机配置IP地址掩码网关等

ISSUE杭州通信技术置DHCP自动配置避免了IP地 的问课程目掌握DHCP原理和特熟悉DHCP协议中IP地址获取过了解DHCP中继的工作原DHCPDHCPDynamicHostConfigurationDHCP是从BOOTP（BootstrapProtocol）协议 DHCP→客户端无须配置即能获得IP地址及相关参数。简化客户端网 →所有IP地址及相关参数信息由DHCP服务器分→→通过使用DHCP中继，可使处于不同子网中的客户端DHCP服务器之间实现协议报文交DHCP系统组网络

网络

DHCP

DHCPDHCP→能提供DHCP功能的服务器或具有DHCP功能的网络设DHCP中→DHCP→需要动态获得IP地址的主DHCP地址分配方根据需求，网络管理员为某些少数特定的主机（如 →主机申请IP地址最常用的方法。DHCP服务器为客户端IP地址动态获取过 DHCPIP地 及释 DHCP DHCP租约更 DHCP使用时间达到租期

使用时间达到租期

DHCP中继工作原网络 网络

DHCP

DHCPDHCP广播报 DHCP单播报DHCP广播报 DHCP服务器基本配[Router]dhcp[Router]dhcp[Router]dhcp[Router]dhcpserverip-poolpool-[mask-length|maskmask配置为DHCP客户端分配的网关地DHCP服务器可选配配置为DHCP客户端分配的DNS服⚫⚫[Router][Router]dhcpserverforbidden-iplow-ip-[high-ip-address[Router-dhcp-pool-0][Router-dhcp-pool-0]expired{dayday[hour[minuteminute]]|unlimitedDHCP服务器基本配置示DNSServer

DHCP[Router][Router]dhcp[Router]serverforbidden-ip192.168.1.10[Router]serverforbidden-ip192.168.1.254[Router]dhcpserverip-pool0[Router-dhcp-pool-0]network192.168.1.0mask[Router-dhcp-pool-0]expiredday5DHCP服务器显示显示DHCP地址池的可用地址信[Router][Router] ydhcp [Router]ydhcpserver[Router]ydhcpserverforbidden-DHCP中继基本配[Router]dhcp[Router]dhcp配置DHCP服务器组中DHCP服务器的IP地[Router][Router]dhcprelayserver-groupgroup-idipip-配置接口工作在DHCP中继模[Router-Ethernet1/1][Router-Ethernet1/1]dhcpselect配置接口与DHCP组关DHCP中继配置示

DHCP

DHCP

[Router][Router]dhcp[Router]dhcprelayserver-group1ip[Router]interfaceethernet[Router-Ethernet1/1]dhcpselect[Router-Ethernet1/1]dhcprelayserver-selectDHCP中继显示显示接口对应的DHCP服务器组的信ydhcprelay{all|[Router]||allydhcprelayserver-group{group-[Router][Router]ydhcprelaystatistics[group{grou