Sysctl source validation

When a system distracts packets when the route for outbound traffic differs from the route of incoming traffic.

net.ipv4.conf.default.rp_filter = 0
net.ipv4.conf.<interface>.rp_filter = 0
net.ipv4.conf.all.rp_filter = 0

/proc

echo "0" > /proc/sys/net/ipv4/conf/default/rp_filter
echo "0" > /proc/sys/net/ipv4/conf/<interface>/rp_filter
echo "0" > /proc/sys/net/ipv4/conf/all/rp_filter

test config

hping <target> --spoof <spoofed_source> --udp -V -p <port> -d $(wc -m payload |  awk '{print $1;}') -E payload