This protection must be enabled if you use your Linux server as a gateway to masquerade internal traffic to the Internet
IP Masquerading.
[root@deep] /#echo 1 > /proc/sys/net/ipv4/ip_always_defrag
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Add the above commands to the
/etc/rc.d/rc.local script file and you'll not have to type it again the next time you reboot your system.
Edit the
/etc/sysctl.conf file and add the following line:
# Enable always defragging Protection
net.ipv4.ip_always_defrag = 1
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You must restart your network for the change to take effect. The command to manually restart the network is the following:
[root@deep] /# /etc/rc.d/init.d/network restart
Setting network parameters [ OK ]
Bringing up interface lo [ OK ]
Bringing up interface eth0 [ OK ]
Bringing up interface eth1 [ OK ]
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