Dear Sophos!

Implement proper ARP-FLUX problem handling in multi-interfaces setup.

ARP-FLUX:
The ARP Flux problem occurs when a host replies to ARP requests for interfaces on the same subnet, from any interface on that same subnet. ... However, in specific cases, ARP Flux generates unexpected behavior of applications due to incorrect mapping between IPv4 addresses and MAC addresses.

FIX:
echo 1 > /proc/sys/net/ipv4/conf/all/arp _ filter
echo 1 > /proc/sys/net/ipv4/conf/all/arp _ ignore
echo 2 > /proc/sys/net/ipv4/conf/all/arp _ announce

echo 1 > /proc/sys/net/ipv4/conf/default/arp _ filter
echo 1 > /proc/sys/net/ipv4/conf/default/arp _ ignore
echo 2 > /proc/sys/net/ipv4/conf/default/arp _ announce

Request:
Make this settings default, or add options to the GUI for turn on/off.

Thx.