命令行程序来testingDHCP服务

即使您不使用Nagios监视服务器，您也可以grep check_dhcp二进制文件或从源代码进行编译，并使用检查来testingDHCP服务器。 例如

./check_dhcp -v -s <dhcp_server_address> -r <expected_ip_address> -m <mac_address_touse> 

dhcpdump适用于在networking上嗅探和显示DHCP数据包。

例如

 # dhcpdump -i eth0 --------------------------------------------------------------------------- TIME: 2015-11-27 11:41:37.379 IP: 0.0.0.0 (0:11:b9:5:0:b8) > 255.255.255.255 (ff:ff:ff:ff:ff:ff) OP: 1 (BOOTPREQUEST) HTYPE: 1 (Ethernet) HLEN: 6 HOPS: 0 XID: abce9327 SECS: 0 FLAGS: 0 CIADDR: 0.0.0.0 YIADDR: 0.0.0.0 SIADDR: 0.0.0.0 GIADDR: 0.0.0.0 CHADDR: 00:11:b9:05:00:b8:00:00:00:00:00:00:00:00:00:00 SNAME: . FNAME: . OPTION: 53 ( 1) DHCP message type 1 (DHCPDISCOVER) OPTION: 57 ( 2) Maximum DHCP message size 576 OPTION: 55 ( 4) Parameter Request List 1 (Subnet mask) 3 (Routers) 28 (Broadcast address) 6 (DNS server) --------------------------------------------------------------------------- 

您可以将其与另一个工具一起使用来执行DHCP请求，或者仅使用它来观看PC /设备查询DHCP。

我前一段时间写了一个DHCPtesting客户端程序，在Windows和POSIX上工作：

https://github.com/Cyber​​Shadow/dhcptest

有一个叫dhcping的程序（只有一个p）

为什么不只是做一个DHCP请求？

 dhclient 

基于这个答案 ，假设你已经安装了nmap（ sudo apt install nmap ）：

 sudo nmap --script broadcast-dhcp-discover 

示例输出：

 Starting Nmap 7.01 ( https://nmap.org ) at 2017-09-27 17:40 CEST Pre-scan script results: | broadcast-dhcp-discover: | Response 1 of 1: | IP Offered: 192.168.81.94 | DHCP Message Type: DHCPOFFER | Server Identifier: 192.168.81.2 | IP Address Lease Time: 5m00s | Subnet Mask: 255.255.255.0 | Router: 192.168.81.2 | Domain Name Server: 192.168.81.2 | Domain Name: example.lan | NTP Servers: 192.168.81.10, 192.168.81.2 | NetBIOS Name Server: 192.168.81.10 |_ NetBIOS Node Type: 8 WARNING: No targets were specified, so 0 hosts scanned. Nmap done: 0 IP addresses (0 hosts up) scanned in 0.66 seconds 

或者在不同的networking上使用nmap v。6：

 Starting Nmap 6.00 ( http://nmap.org ) at 2017-09-27 17:42 CEST Pre-scan script results: | broadcast-dhcp-discover: | IP Offered: 192.168.4.101 | DHCP Message Type: DHCPOFFER | Server Identifier: 192.168.4.1 | IP Address Lease Time: 7 days, 0:00:00 | Subnet Mask: 255.255.255.0 | Time Offset: 7200 | Router: 192.168.4.1 | Domain Name Server: 208.91.112.53, 208.91.112.52 | Renewal Time Value: 3 days, 12:00:00 |_ Rebinding Time Value: 6 days, 3:00:00 WARNING: No targets were specified, so 0 hosts scanned. Nmap done: 0 IP addresses (0 hosts up) scanned in 1.15 seconds 

在Debian-Ubuntu系统上：

 dhcpd -f 

给出良好的反馈并testingconfiguration。

在RH系统上尝试：

 /etc/rc.d/init.d/dhcpd configtest 

或者你可以在testing模式下尝试dhcpcd ：

 dhcpcd -T eth0 

如果你使用nagios，你可以使用check_dhcp来监视它