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DHCP 服务器没有出现在 nmap 上，没有错误

tag-icon • tag-icon linux ubuntu dhcp
DHCP 服务器没有出现在 nmap 上，没有错误

我最近尝试进入 Ubuntu（最新版本），但 DHCP 服务器出现问题。我根据我的学生用书配置了文件/etc/network/interfaces，/etc/dhcp/dhcpd.conf但似乎不起作用。 Nmap 根本不显示我的 DHCP，所以我认为它根本没有打开，但仍然 - 当我使用以下设置启动/重新启动守护进程和服务时绝对没有错误：

interfaces文件：

auto lo
iface lo inet loopback

auto eth1
iface eth1 inet static
address 192.168.0.110
gateway 192.168.0.1
netmask 255.255.255.0
network 192.168.0.0
broadcast 192.168.0.255

dhcpd.conf文件：

subnet 192.168.0.0 netmask 255.255.255.0 {
        option routers                  192.168.0.1;
        option subnet-mask              255.255.255.0;
        option domain-search              "example.com";
        option domain-name-servers       192.168.0.100;
        option time-offset              -18000;     # Eastern Standard Time
        range 192.168.0.150 192.168.0.160;
}

如果配置：

eth1      Link encap:Ethernet  HWaddr e0:3f:49:7f:f6:20  
          inet addr:192.168.0.110  Bcast:192.168.0.255  Mask:255.255.255.0
          inet6 addr: fe80::e23f:49ff:fe7f:f620/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1046758 errors:0 dropped:0 overruns:0 frame:0
          TX packets:647564 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:1381761035 (1.3 GB)  TX bytes:88156037 (88.1 MB)
          Interrupt:16 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:45940 errors:0 dropped:0 overruns:0 frame:0
          TX packets:45940 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:3127593 (3.1 MB)  TX bytes:3127593 (3.1 MB)

isc-dhcp-服务器：

# Defaults for isc-dhcp-server initscript
# sourced by /etc/init.d/isc-dhcp-server
# installed at /etc/default/isc-dhcp-server by the maintainer scripts

#
# This is a POSIX shell fragment
#

# Path to dhcpd's config file (default: /etc/dhcp/dhcpd.conf).
DHCPD_CONF=/etc/dhcp/dhcpd.conf

# Path to dhcpd's PID file (default: /var/run/dhcpd.pid).
DHCPD_PID=/var/run/dhcpd.pid

# Additional options to start dhcpd with.
#   Don't use options -cf or -pf here; use DHCPD_CONF/ DHCPD_PID instead
#OPTIONS=""

# On what interfaces should the DHCP server (dhcpd) serve DHCP requests?
#   Separate multiple interfaces with spaces, e.g. "eth0 eth1".
INTERFACES="eth1"

有什么问题吗？

答案1

nmap是一种 IP 工具，DHCP是一种分配 IP 地址的方法，它不在 IP 层运行，因为这将使其仅对不再需要它的实体有用。结果，nmap就看不到了。

如果您仍然觉得有问题，可以使用一些工具来测试 DHCP 服务器（例如https://github.com/Cyber​​Shadow/dhcptest-虽然我从未尝试过）

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