CentOS7 IP_forward 設定(ipforward)

cat << __EOF__ >> /etc/sysctl.d/10-ipv4.conf

net.ipv4.ip_forward = 1

__EOF__

# systemctl restart networks

# sysctl --system
* Applying /usr/lib/sysctl.d/00-system.conf ...
* Applying /etc/sysctl.d/10-ipv4.conf ...
net.ipv4.ip_forward = 1
* Applying /usr/lib/sysctl.d/50-default.conf ...
kernel.sysrq = 16
kernel.core_uses_pid = 1
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.default.accept_source_route = 0
net.ipv4.conf.all.accept_source_route = 0
net.ipv4.conf.default.promote_secondaries = 1
net.ipv4.conf.all.promote_secondaries = 1
fs.protected_hardlinks = 1
fs.protected_symlinks = 1
* Applying /usr/lib/sysctl.d/60-libvirtd.conf ...
fs.aio-max-nr = 1048576
* Applying /etc/sysctl.d/99-sysctl.conf ...
* Applying /etc/sysctl.conf ...

※一時的に設定する場合は、

# sysctl -w net.ipv4.ip_forward=1