注意：我将运行 isc-dhcp-server 的服务器称为“DHCP-SERVER”，并将连接到我的交换机的计算机称为“DHCP-Clients”

嗨，我目前正在建立一个网络，但我无法通过 DHCP 客户端共享互联网。我也在使用isc-dhcp-server 例如，我的 DHCP-SERVER 可以 ping google.com，使用 SSH 我的 dhcp-clients 登录。我的 DHCP 客户端可以 ping DHCP 服务器，除此之外别无其他。运行 ping google.com 时，输出如下

user@client1:~ $ ping google.com
ping: google.com: Temporary failure in name resolution

在这里，您可以找到 我的设置图

DHCP服务器

接口：

1. WLAN：wlp2s0，连接到我的wifi路由器，可以与世界交互（例如ping google.com工作）
2. 以太网：enx0050b62184c1，连接到我的交换机，可以与交换机的有线客户端交互

isri@shuttle:~$ cat /etc/network/interfaces

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*

# The loopback network interface
auto lo
iface lo inet loopback

auto enx0050b62184c1
iface enx0050b62184c1 inet static
  address 10.0.2.1
  #netmask 255.255.255.240
  gateway 192.168.1.1

user@dhcp-server:~$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever

2: enx0050b62184c1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:50:b6:21:84:c1 brd ff:ff:ff:ff:ff:ff
    inet 10.0.2.1/8 brd 10.255.255.255 scope global enx0050b62184c1
       valid_lft forever preferred_lft forever
    inet6 fe80::250:b6ff:fe21:84c1/64 scope link
       valid_lft forever preferred_lft forever

3: wlp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether b0:c0:90:92:c4:6b brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.99/24 brd 192.168.1.255 scope global dynamic noprefixroute wlp2s0
       valid_lft 86329sec preferred_lft 86329sec
    inet6 fe80::b2c0:90ff:fe92:c46b/64 scope link noprefixroute
       valid_lft forever preferred_lft forever

/etc/dhcp/dhcpd.conf

user@dhcp-server:~$ cat /etc/default/isc-dhcp-server
# Defaults for isc-dhcp-server (sourced by /etc/init.d/isc-dhcp-server)

# Path to dhcpd's config file (default: /etc/dhcp/dhcpd.conf).
#DHCPDv4_CONF=/etc/dhcp/dhcpd.conf
#DHCPDv6_CONF=/etc/dhcp/dhcpd6.conf

# Path to dhcpd's PID file (default: /var/run/dhcpd.pid).
#DHCPDv4_PID=/var/run/dhcpd.pid
#DHCPDv6_PID=/var/run/dhcpd6.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".
INTERFACESv4="enx0050b62184c1"
#INTERFACESv6=""

dhcpd 配置文件

user@dhcp-server:~$ cat /etc/dhcp/dhcpd.conf
# dhcpd.conf
option domain-name "my-network";
# option domain-name-servers none;
# option domain-name-servers 192.168.1.1;
default-lease-time 600;
max-lease-time 7200;
ddns-update-style none;
subnet 10.0.2.0 netmask 255.255.255.240 {
   range 10.0.2.2 10.0.2.14;
   option routers 10.0.2.1;
   host client1 {
      hardware ethernet b8:27:eb:d3:83:02;
      fixed-address     10.0.2.6;
   }

   host client2 {
      hardware ethernet b8:27:eb:1e:8f:9d;
      fixed-address     10.0.2.5;
   }

   host client3 {
      hardware ethernet b8:27:eb:bd:fc:16;
      fixed-address     10.0.2.4;
   }

}

到目前为止我尝试过的

我尝试在我的 DHCP 服务器上使用以下命令 iptables -t nat -A POSTROUTING -s 10.0.2.0/28 -j MASQUERADE

我还启用了 net.ipv4.ip_forward。 sysctl -w net.ipv4.ip_forward=1

在我的 /etc/network/interfaces 文件中，我还尝试将 192.168.1.1 替换为我的给定 IP 192.168.1.99。

但没有任何效果。知道为什么吗？

MeMow 的回答：我更改了“option domain-name-servers none;” 到我的本地 DNS IP（由我的 ISP 提供的 IP）。现在，在 ping 一个网站时，我遇到了这个问题：

user@client1:~ $ ping google.com
PING google.com (142.250.74.238) 56(84) bytes of data.
From 10.0.2.1 (10.0.2.1) icmp_seq=1 Destination Host Unreachable
From 10.0.2.1 (10.0.2.1) icmp_seq=2 Destination Host Unreachable
From 10.0.2.1 (10.0.2.1) icmp_seq=3 Destination Host Unreachable