Archive for June, 2015

Amazon EC2: how to ping among instances

You can ping instances that are in the same security group by connecting through ssh using the internal IP:
ping 10.0.0.15

In some posts and forum I read about adding custom ICMP rule in the security group. However it´s not what it takes, a least for me.
But the following rule will work:
Type: All ICMP
Protocol: TCP
Port range: 0 – 65535
Source: Anywhere – 0.0.0.0/0

After doing this you will be able to ping other instances. You should see something like:

PING 10.0.0.15 (10.0.0.15): 56 data bytes
64 bytes from 10.0.0.14: icmp_seq=1 ttl=64 time=3.9 ms
64 bytes from 10.0.0.14: icmp_seq=2 ttl=64 time=3.9 ms
64 bytes from 10.0.0.14: icmp_seq=3 ttl=64 time=10.6 ms
64 bytes from 10.0.0.14: icmp_seq=4 ttl=64 time=40.6 ms
64 bytes from 10.0.0.14: icmp_seq=5 ttl=64 time=3.8 ms
64 bytes from 10.0.0.14: icmp_seq=6 ttl=64 time=5.3 ms
64 bytes from 10.0.0.14: icmp_seq=7 ttl=64 time=6.5 ms
64 bytes from 10.0.0.14: icmp_seq=8 ttl=64 time=3.5 ms
64 bytes from 10.0.0.14: icmp_seq=9 ttl=64 time=21.0 ms
64 bytes from 10.0.0.14: icmp_seq=10 ttl=64 time=3.5 ms
64 bytes from 10.0.0.14: icmp_seq=11 ttl=64 time=3.5 ms
64 bytes from 10.0.0.14: icmp_seq=12 ttl=64 time=59.7 ms
64 bytes from 10.0.0.14: icmp_seq=13 ttl=64 time=3.5 ms
64 bytes from 10.0.0.14: icmp_seq=14 ttl=64 time=3.5 ms
64 bytes from 10.0.0.14: icmp_seq=15 ttl=64 time=4.8 ms
64 bytes from 10.0.0.14: icmp_seq=16 ttl=64 time=3.1 ms
64 bytes from 10.0.0.14: icmp_seq=17 ttl=64 time=3.1 ms
64 bytes from 10.0.0.14: icmp_seq=18 ttl=64 time=3.0 ms
64 bytes from 10.0.0.14: icmp_seq=19 ttl=64 time=3.1 ms

--- 10.0.0.14 ping statistics ---
20 packets transmitted, 19 packets received, 5% packet loss
round-trip min/avg/max = 3.0/9.9/59.7 ms

That´s it.

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