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测试 DHCP 服务的命令行程序

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测试 DHCP 服务的命令行程序

是否有一个简单的类似 ping 的命令来测试 DHCP 服务是否在网络上运行？...在​​ Linux 上

答案1

即使你不使用 Nagios 监控服务器，你也可以使用 grep检查DHCP二进制文件或从源代码编译它并使用检查来测试 DHCP 服务器。例如

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

答案2

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

-e $interface如果您有多个网络接口，请添加该选项。（例如nmap --script broadcast-dhcp-discover -e eth0：）

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

或者在另一个网络上使用 nmap v. 6 获得此输出：

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

答案3

dhcpcd或者您可以在测试模式下尝试：

dhcpcd -T eth0

答案4

为什么不直接发出 DHCP 请求？

dhclient

对于详细输出使用：

dhclient-v

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