linux临时修改网关和DNS

临时修改ip命令：
#修改网卡eth0 IP修改为102.168.0.1，子网掩码修改为255.255.255.0

ifconfig eth0 102.168.0.1 netmask 255.255.255.0

#网关修改为102.168.0.254

route add default gw 102.168.0.254

#Linux命令行修改dns

echo "nameserver 202.202.202.20 ">> /etc/resolv.conf