dhcpcd.conf文件固定IP地址的方法
单于翰飞
这里以全志的T507CPU为例子配置IP，开发板方案来自荣品电子科技
配置文件目录/etc/dhcpcd.conf
原配置文件内容
# 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;
# option definitions common to all supported networks...
option domain-name "example.org";
option domain-name-servers ns1.example.org, ns2.example.org;
default-lease-time 600;
max-lease-time 7200;
# 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 10.254.239.0 netmask 255.255.255.224 {
# range 10.254.239.10 10.254.239.20;
# option routers rtr-239-0-1.example.org, rtr-239-0-2.example.org;
#}
# 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 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.fugue.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.fugue.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;
# }
#}
#
固定IP
默认是DHCP模式的，固定的方法就是在原文后面追加需要配置的网口IP配置信息就行，然后重新网卡service network restart，但是很多开发板用不了这条命令，所以可以执行先后执行ifconfig eth0 down(关闭网卡)ifconfig eth0 up(启动网卡)，或者重启开发板也可以
interface eth0 #网卡名称
static ip_address=192.168.1.211/24 #IP和子网掩码
static routers=192.168.1.1 #网关
static domain_name_servers=114.114.114.114 192.168.1.1 #DNS地址
特别介绍下static ip_address=192.168.1.211/24 这条命令中意思
192.168.1.211是需要固定的IP
/24子网掩码，子网掩码总共32位，这里的24表示前面的24位1，后面剩下的8位为0，
那翻译成平常用的子网掩码就是（11111111 11111111 11111111 00000000）即255.255.255.0
static domain_name_servers=114.114.114.114 192.168.1.1，这里配置了两个DNS，在重启网卡的时候这两个DNS会自动写入到/etc/resolv.conf 这个DNS配置文件
wifi模块的固定
interface wlan0
static ip_address=192.168.1.217/24
static routers=192.168.1.1
static domain_name_servers=8.8.8.8
总结
wifi和有线网口的配置都一样 如果DNS配置是相同的 就只会加入一次 DNS不同就会追加配置，DNS用标准的8.8.8.8和114.114.114.144或者用网关地址192.168.1.1(网关地址根据自己网口而定)都行，目的都是为了能够访问域名服务器进行域名解析。
# /etc/resolv.conf.head can replace this line
nameserver 114.114.114.114
nameserver 192.168.1.1
nameserver 8.8.8.8
# /etc/resolv.conf.tail can replace this line
路由表自动加入，无需手动添加
# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.1.1 0.0.0.0 UG 202 0 0 eth0
0.0.0.0 192.168.1.1 0.0.0.0 UG 310 0 0 wlan0
192.168.1.0 0.0.0.0 255.255.255.0 U 202 0 0 eth0
192.168.1.0 0.0.0.0 255.255.255.0 U 310 0 0 wlan0
如果需要DHCP的方式，只需要把上面添加的固定IP信息的内容去掉即可，
4G拨号可能会导致DNS文件resolv.conf被覆盖，还待验证
类似资料：