# ubuntu 18.04
## **安装DHCP服务**
~~~
apt install isc-dhcp-server
~~~
## **配置DHCP Server**
#### 1 修改 /etc/default/isc-dhcp-serve
~~~
vim /etc/default/isc-dhcp-server
~~~
配置ifconfig中的目标主机网卡网卡地址，该网卡必须是手动获取IP的方式不能是DHCP Client
~~~
INTERFACESv4="enx000ec6b88013"
~~~
* /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="enx000ec6b88013"
INTERFACESv6=""
~~~
#### 2 设置DHCP租期
~~~
vim /etc/dhcp/dhcpd.conf
~~~
~~~
default-lease-time 86400;
max-lease-time 86400;
~~~
#### 3 配置DHCP信息
~~~
subnet 192.168.143.0 netmask 255.255.255.0 {
# Specify the default gateway address
option routers 192.168.143.1;
# Specify the subnet-mask
option subnet-mask 255.255.255.0;
# Specify the range of leased IP addresses
range 192.168.143.50 192.168.143.200;
}
~~~
#### 4 修改 domain-name && domain-name-servers
~~~
option domain-name "www.baidu.com";
option domain-name-servers 8.8.8.8, 114.114.114.114;
~~~
### 5\. 启动服务
~~~
systemctl enable isc-dhcp-server #开机自启动
systemctl restart isc-dhcp-server # 重启服务
~~~
* /etc/dhcp/dhcpd.conf
~~~
# dhcpd.conf
#
# Sample configuration file for ISC dhcpd
#
# Attention: If /etc/ltsp/dhcpd.conf exists, that will be used as
# configuration file instead of this file.
#
# option definitions common to all supported networks...
option domain-name "www.baidu.com";
option domain-name-servers 8.8.8.8, 114.114.114.114;
default-lease-time 86400;
max-lease-time 86400;
# The ddns-updates-style parameter controls whether or not the server will
# attempt to do a DNS update when a lease is confirmed. We default to the
# behavior of the version 2 packages ('none', since DHCP v2 didn't
# have support for DDNS.)
ddns-update-style none;
# If this DHCP server is the official DHCP server for the local
# network, the authoritative directive should be uncommented.
#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;
# No service will be given on this subnet, but declaring it helps the
# DHCP server to understand the network topology.
#subnet 10.152.187.0 netmask 255.255.255.0 {
#}
# This is a very basic subnet declaration.
subnet 192.168.143.0 netmask 255.255.255.0 {
# Specify the default gateway address
option routers 192.168.143.1;
# Specify the subnet-mask
option subnet-mask 255.255.255.0;
# Specify the range of leased IP addresses
range 192.168.143.50 192.168.143.200;
}
# This declaration allows BOOTP clients to get dynamic addresses,
# which we don't really recommend.
#subnet 10.254.239.32 netmask 255.255.255.224 {
# range dynamic-bootp 10.254.239.40 10.254.239.60;
# option broadcast-address 10.254.239.31;
# option routers rtr-239-32-1.example.org;
#}
# A slightly different configuration for an internal subnet.
#subnet 10.5.5.0 netmask 255.255.255.224 {
# range 10.5.5.26 10.5.5.30;
# option domain-name-servers ns1.internal.example.org;
# option domain-name "internal.example.org";
# option subnet-mask 255.255.255.224;
# option routers 10.5.5.1;
# option broadcast-address 10.5.5.31;
# default-lease-time 600;
# max-lease-time 7200;
#}
# Hosts which require special configuration options can be listed in
# host statements. If no address is specified, the address will be
# allocated dynamically (if possible), but the host-specific information
# will still come from the host declaration.
#host passacaglia {
# hardware ethernet 0:0:c0:5d:bd:95;
# filename "vmunix.passacaglia";
# server-name "toccata.example.com";
#}
# Fixed IP addresses can also be specified for hosts. These addresses
# should not also be listed as being available for dynamic assignment.
# Hosts for which fixed IP addresses have been specified can boot using
# BOOTP or DHCP. Hosts for which no fixed address is specified can only
# be booted with DHCP, unless there is an address range on the subnet
# to which a BOOTP client is connected which has the dynamic-bootp flag
# set.
#host fantasia {
# hardware ethernet 08:00:07:26:c0:a5;
# fixed-address fantasia.example.com;
#}
# You can declare a class of clients and then do address allocation
# based on that. The example below shows a case where all clients
# in a certain class get addresses on the 10.17.224/24 subnet, and all
# other clients get addresses on the 10.0.29/24 subnet.
#class "foo" {
# match if substring (option vendor-class-identifier, 0, 4) = "SUNW";
#}
#shared-network 224-29 {
# subnet 10.17.224.0 netmask 255.255.255.0 {
# option routers rtr-224.example.org;
# }
# subnet 10.0.29.0 netmask 255.255.255.0 {
# option routers rtr-29.example.org;
# }
# pool {
# allow members of "foo";
# range 10.17.224.10 10.17.224.250;
# }
# pool {
# deny members of "foo";
# range 10.0.29.10 10.0.29.230;
# }
#}
~~~
## NAT
```
echo 1 > /proc/sys/net/ipv4/ip_forward
interface=$(cat /proc/net/dev | awk '{i++; if(i>2){print $1}}' | sed 's/^[\t]*//g' | sed 's/[:]*$//g'
| grep enx)
iptables -t nat -A POSTROUTING -o ${interface} -j MASQUERAD
```
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