test

系统管理指南：IP 服务

DHCP 客户机在调试模式下的输出

以下示例显示了 DHCP 客户机在调试模式下发送 DHCP 请求并从 DHCP 服务器接收配置信息时的标准输出。

示例 17–1 DHCP 客户机在调试模式下的标准输出


/sbin/dhcpagent: debug: set_packet_filter: set filter 0x27fc8 (DHCP filter) 
/sbin/dhcpagent: debug: init_ifs: initted interface hme0 
/sbin/dhcpagent: debug: insert_ifs: hme0: sdumax 1500, optmax 1260, hwtype 1, hwlen 6 
/sbin/dhcpagent: debug: insert_ifs: inserted interface hme0 
/sbin/dhcpagent: debug: register_acknak: registered acknak id 5 
/sbin/dhcpagent: debug: unregister_acknak: unregistered acknak id 5 
/sbin/dhcpagent: debug: set_packet_filter: set filter 0x26018 (ARP reply filter)
/sbin/dhcpagent: info: setting IP netmask on hme0 to 255.255.192.0 
/sbin/dhcpagent: info: setting IP address on hme0 to 10.23.3.233 
/sbin/dhcpagent: info: setting broadcast address on hme0 to 10.23.63.255 
/sbin/dhcpagent: info: added default router 10.23.0.1 on hme0 
/sbin/dhcpagent: debug: set_packet_filter: set filter 0x28054 (blackhole filter) 
/sbin/dhcpagent: debug: configure_if: bound ifsp->if_sock_ip_fd 
/sbin/dhcpagent: info: hme0 acquired lease, expires Tue Aug 10 16:18:33 2006 
/sbin/dhcpagent: info: hme0 begins renewal at Tue Aug 10 15:49:44 2006 
/sbin/dhcpagent: info: hme0 begins rebinding at Tue Aug 10 16:11:03 2006

如果客户机无法访问 DHCP 服务器，则看到的调试模式输出可能会类似于以下示例所显示的输出。

示例 17–2 指明 DHCP 客户机在调试模式下出现问题的输出


/sbin/dhcpagent: debug: set_packet_filter: set filter 0x27fc8 (DHCP filter)
/sbin/dhcpagent: debug: init_ifs: initted interface hme0 
/sbin/dhcpagent: debug: select_best: no valid OFFER/BOOTP reply
/sbin/dhcpagent: debug: select_best: no valid OFFER/BOOTP reply
/sbin/dhcpagent: debug: select_best: no valid OFFER/BOOTP reply

如果看到此消息，则表明客户机请求永远无法到达服务器，或者服务器无法将响应发送到客户机。请按照如何使用 snoop 监视 DHCP 网络通信流量中所述，在服务器上运行 snoop，以确定来自客户机的包是否已到达服务器。