Ubuntu 14.04 中没有 IP 转发

Question

我对 Linux 或 Ubuntu 不太熟悉。
我最近在HP Proliant 服务器。我的问题是我无法使用我的Windows 10 客户端。服务器可以访问互联网，客户端可以访问 Ubuntu 服务器，但不能访问互联网。IP 转发设置为“1”

{{
auto lo em2 em1
iface lo inet loopback

# The primary network interface
iface em2 inet static
    address 192.168.178.5
    netmask 255.255.255.0
    network 192.168.178.0
    broadcast 192.168.178.255
    dns-nameserver 10.10.1.1 
    dns-nameserver 8.8.8.8 
    dns-nameserver 8.8.4.4 
    gateway 192.168.178.1
    dns-domain vgg.net
    dns-nameservers 10.10.1.1
    dns-domain vgg.net localhost.localnet
    # dns-* options are implemented by the resolvconf package, if installed

iface em1 inet static
    address 10.10.1.1
    netmask 255.255.0.0
    network 10.10.1.0
    broadcast 10.10.255.255
    dns-nameserver 10.10.1.1 
    dns-nameserver 8.8.8.8 
    dns-nameserver 8.8.4.4 
    post-up iptables -t nat -F POSTROUTING
    post-up iptables -t nat -A POSTROUTING -o em2 -j MASQUERADE
    post-up iptables-restore < /etc/iptables.up.rules
    dns-domain vgg.net localhost.localnet
}}