Source Routing is a feature that allows the sender of the packet to specify the route that the destination must take while sending back a reply. Now, assume a situation that an attacker manages to inject a source routed packet into your network. The attacker might configure a malicious path for the packet and cause security concerns for you.

It is best to disable source rotuing. On Cisco routers, the source routing can be disabled by

configure terminal
no ip-source \

On Linux based machines, one of the method to disable the source rotuing is by editing the configurations. Execute the below code and restart the networking services (/etc/init.d/networking restart) for the changes to take effect.

for f in /proc/sys/net/ipv4/conf/*/accept_source_route; do
echo 0 > $f
done \