localhost lab3 # ping -c 5 10.0.1.21
PING 10.0.1.21 (10.0.1.21) 56(84) bytes of data.
64 bytes from 10.0.1.21: icmp_seq=1 ttl=64 time=1.85 ms
64 bytes from 10.0.1.21: icmp_seq=2 ttl=64 time=0.144 ms
64 bytes from 10.0.1.21: icmp_seq=3 ttl=64 time=0.113 ms
64 bytes from 10.0.1.21: icmp_seq=4 ttl=64 time=0.135 ms
64 bytes from 10.0.1.21: icmp_seq=5 ttl=64 time=0.135 ms

--- 10.0.1.21 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4045ms
rtt min/avg/max/mdev = 0.113/0.477/1.859/0.691 ms
localhost lab3 # ping -c 5 10.0.2.21
connect: Network is unreachable
localhost lab3 # ping -c 5 10.0.3.41
connect: Network is unreachable
localhost lab3 #