本文主要是介绍ubuntu 开启ip转发的方法，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

ubuntu 开启网关转发

修改文件 /etc/sysctl.conf

cat /etc/sysctl.conf

1. 找到 net.ipv4.ip_forward=1 这一行，取消注释既可

nano /etc/sysctl.conf

##############################################################3
# Functions previously found in netbase
#

# Uncomment the next two lines to enable Spoof protection (reverse-path filter)
# Turn on Source Address Verification in all interfaces to
# prevent some spoofing attacks
#net.ipv4.conf.default.rp_filter=1
#net.ipv4.conf.all.rp_filter=1

# Uncomment the next line to enable TCP/IP SYN cookies
# See http://lwn.net/Articles/277146/
# Note: This may impact IPv6 TCP sessions too
#net.ipv4.tcp_syncookies=1

# Uncomment the next line to enable packet forwarding for IPv4
net.ipv4.ip_forward=1

# Uncomment the next line to enable packet forwarding for IPv6
#  Enabling this option disables Stateless Address Autoconfiguration
#  based on Router Advertisements for this host
#net.ipv6.conf.all.forwarding=1


###################################################################

2. 保存生效

$ sysctl -p

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