Comment # 30 on bug 1171770 from Rafael Fern�ndez L�pez

Case 1
======

echo 1 | sudo tee /proc/sys/net/ipv4/conf/all/forwarding
1
echo 0 | sudo tee /proc/sys/net/ipv4/conf/wlp1s0/forwarding
0
cat /proc/sys/net/ipv4/conf/wlp1s0/forwarding
0
echo 1 | sudo tee /proc/sys/net/ipv4/conf/all/forwarding
1
cat /proc/sys/net/ipv4/conf/wlp1s0/forwarding
0

Case 2
======

echo 1 | sudo tee /proc/sys/net/ipv4/conf/all/forwarding
1
echo 0 | sudo tee /proc/sys/net/ipv4/conf/wlp1s0/forwarding
0
cat /proc/sys/net/ipv4/conf/wlp1s0/forwarding
0
echo 0 | sudo tee /proc/sys/net/ipv4/conf/all/forwarding  ## FORCE CYCLING
0                                                         ##
echo 1 | sudo tee /proc/sys/net/ipv4/conf/all/forwarding  ##
1                                                         ##
cat /proc/sys/net/ipv4/conf/wlp1s0/forwarding
1                                                         ## IT'S 1