Hey Pondus,
I incorrectly writed Avast but was meant to write off course my local router firewall, and yes the router has a firewall! I´m doing right now on the router firewall. This is not a gateway DSL but a local router behind a ONT. So the ONT gives acess to internet and Local router gives a home management
Beacuse as you may know someone can acess your network using this ping reply throught ICMP protocol in order to use exploits to gain acess and by turning ICMP echo ping reply off, as it should always be its harder for someone to do this.