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DHCP 服务器无法启动。即使已配置，仍显示“未配置为侦听任何接口！”

tag-icon • tag-icon networking server dhcp dhcpd
DHCP 服务器无法启动。即使已配置，仍显示“未配置为侦听任何接口！”

我刚刚在服务器上设置了 isc-dhcp。我甚至设置了正确的接口。但 dhcp 服务器仍然无法启动。Not configured to listen on any interfaces!系统日志中显示。当我尝试时，dhcpd -t /etc/dhcp/dhcpd.conf它给出了此错误：/etc/dhcp/dhcpd.conf: interface name too long (is 20

这是我的 dhcpd.conf：

ddns-update-style none;

option domain-name "thpi";
option domain-name-servers 208.67.222.222, 208.67.220.220;

default-lease-time 86400;
max-lease-time 604800;

authoritative;

# Use this to send dhcp log messages to a different log file (you also
# have to hack syslog.conf to complete the redirection).
log-facility local7;


subnet 10.0.0.0 netmask 255.255.255.0 {
    ## dhcp start  and end IP range ##
    range 10.0.0.20 10.0.0.90;
    option subnet-mask 255.255.255.0;     ## subnet
    option broadcast-address 10.0.0.255; ## broadcast
    option routers 10.0.0.1; ## router IP


    host pc1 {
        hardware ethernet 60:a4:4c:3d:76:fa;
        fixed-address 10.0.0.100;
    }

    host lap1 {
        hardware ethernet 6c:71:d9:1e:f3:4f;
        fixed-address 10.0.0.150;
    }

    host thnote {
        hardware ethernet d0:22:be:d3:be:e1;
        fixed-address 10.0.0.200;
    }
}

/etc/default/isc-dhcp-server文件 ：

# 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="eth0:0"

接口文件：

auto lo

iface lo inet loopback

auto eth0
iface eth0 inet static
address 192.168.1.10
netmask 255.255.255.0
network 192.168.1.0
broadcast 192.168.1.255
gateway 192.168.1.1

auto eth0:0
iface eth0:0 inet static
name Lan
address 10.0.0.1
netmask 255.255.255.0
network 10.0.0.0

allow-hotplug wlan0
iface wlan0 inet manual
wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf
iface default inet dhcp

可能存在什么问题？

答案1

你的/etc/default/isc-dhcp-server文件应该有

INTERFACES="eth0"

答案2

我遇到了同样的问题，在为我的接口分配 IP 地址后问题得到了解决

喜欢，

ifconfig eth0 192.168.1.100

答案3

我也遇到了同样的问题。对于 Ubuntu 20.04 1 LTS。我有两个 NIC，我只想使用其中一个通过 dhcp 向 LAN 上的客户端提供 IP。

我的修复方法是以下几种方法的组合。不过，我认为真正的修复方法是向 /etc/dhcp/dhcpd.conf 添加接口

/etc/dhcp/dhcpd.conf
was (broken):

default-lease-time 600;
max-lease-time 7200;
ddns-update-style none;
authoritative;

subnet 192.168.0.0 netmask 255.255.255.0 {
   range 192.168.0.2 192.168.0.99;
   option routers 192.168.0.1;
   option subnet-mask 255.255.255.0;
   option domain-name-servers 1.1.1.1, 1.0.0.1, 8.8.8.8;
}


changed to (added interface and it worked):

default-lease-time 600;
max-lease-time 7200;
ddns-update-style none;
authoritative;

subnet 192.168.0.0 netmask 255.255.255.0 {
   interface enp6s0;
   range 192.168.0.2 192.168.0.99;
   option routers 192.168.0.1;
   option subnet-mask 255.255.255.0;
   option domain-name-servers 1.1.1.1, 1.0.0.1, 8.8.8.8;
}

在进行 hack 时，我还更改了以下内容，但不确定现在是否需要这样做。显示完整性。

/etc/default/isc-dhcp-server
was:
INTERFACESv4=""
INTERFACESv6=""

changed to (the interface I want dhcp to use):
INTERFACESv4="enp6s0"
INTERFACESv6="enp6s0"

答案4

开始建立人际网络有两种方式

  1. 通过 /etc/network/interfaces

  2. 通过 NetworkManager

    1. 尽早开始
    2. 开始得晚

DHCPD 尝试在 1) 之后但在 2) 之前启动

如果 dhcpd 无法检测网络，请尝试方法 1)

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