Destination Host Unreachable when pinging but the laptop is connected to internet and its visible to the ISP modem

I have a PC and a laptop connected to the local network. Both have Ubuntu 18.04.4 Desktop, and both are visible to the modem:

But when I try to ping the laptop from the pc it says: Destination Host Unreachable :

(base) marco@pc:~$ sudo ping 192.168.1.9
PING 192.168.1.9 (192.168.1.9) 56(84) bytes of data.
From 192.168.1.7 icmp_seq=1 Destination Host Unreachable
From 192.168.1.7 icmp_seq=2 Destination Host Unreachable

On the laptop there is no active firewall:

(base) marco@marco-U365G:~$ sudo ufw status
Status: inactive

This is /etc/netplan/01-network-manager-all.yaml of the laptop:

network version: 2 renderer: NetworkManager # renderer: networkd ethernets: enp3s0: dhcp4: no addresses: [192.168.1.9/24] gateway4: 192.168.1.1 nameservers: addresses: [8.8.8.8,8.8.4.4]

I tried to use nmap from both pc and laptop:

(base) marco@pc:~$ sudo nmap -sn 192.168.1.0/24
Starting Nmap 7.60 ( ) at 2021-05-06 18:28 CEST
Nmap scan report for (192.168.1.1)
Host is up (0.00045s latency).
MAC Address: 74:36:6D:9A:5A:63 (Unknown)
Nmap scan report for pc (192.168.1.7)
Host is up.
Nmap done: 256 IP addresses (2 hosts up) scanned in 3.77 seconds

And from the laptop:

(base) marco@marco-U365G:~$ nmap -sn 192.168.1.9/24
Starting Nmap 7.60 ( ) at 2021-05-06 18:29 CEST
Nmap scan report for_gateway (192.168.1.1)
Host is uo (0.00075s latency)
Nmap scan report for marco-U365C (192.168.1.9)
Host is uo (0.000054s latency)
Nmap done: 256 IP addresses (2 hosts up) scanned in 3.21 seconds

In the laptop I also pinged to localhost, to check if the network interface is up:

(base) marco@marco-U354G:~$ oung 127.0.0.1
PING 127.0.0.1 (127.0.0.1) 56(84) bytes of data.
64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.094 ms
64 bytes from 127.0.0.1: icmp_seq=2 ttl=64 time=0.085 ms

Actually I realized that pinging to other devices doesn't work either:

(base) marco@pc:~$ sudo ping 192.168.1.3 PING 192.168.1.3 (192.168.1.3) 56(84) bytes of data. From 192.168.1.7 icmp_seq=1 Destination Host Unreachable

I realized that this is happening, may be, since the router change by he Internet Service Provider.

How to solve the problem?

9 Sorted by: Reset to default

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