Why can I ping other hosts on different subnet but cannot ping back?

[notduongdang]

I setup a very simple network using the internet from main router (10.10.96.1/19) connecting to WAN port on my own router (10.10.104.135/19).

Inside my network, the router has IP 192.168.0.1/24 and my laptop has IP 192.168.0.2/24 (default gateway 192.168.0.1).

What makes me confused is that I can ping from my laptop to an IP (let's say) 10.10.98.20/19(same subnet with the router). But I cannot ping from 10.10.98.20/19 to my laptop.

I understand that I have to create a static route on big router (10.10.96.1/19) to make that host communicate with my laptop. But why can it reply the ping request from my laptop if it does not know the route?

[Travo97]

The firewall on your laptop may be blocking ICMP echo-replies. Try temporarily disabling the firewall and see if it solves the issue, if it does create a firewall rule to allow ICMP.

[Guest]

4 hours ago, Travo97 said:

The firewall on your laptop may be blocking ICMP echo-replies. Try temporarily disabling the firewall and see if it solves the issue, if it does create a firewall rule to allow ICMP.

Pretty much.

 

If one host can ping the other and the static routes in both directions are made, generally it's a firewall issue. Natively I think for public network types, Windows will block ICMPv4 and ICMPv6 ping requests so add a firewall rule to enable that service.

 

Ensure though as I mentioned that the static routes for both networks have been made.