Home / server / Questions / 618251
Accepted
jayunit100
Asked: 2014-08-06 14:17:54 +0800 CST

How to set up routing tables in EC2, so that ping works

  • 772

I have a wide open security group which I rely on for instances to be able to connect. I also have a private network of 172.*. addresses, as shown here:

enter image description here

What do I need to do in order to allow servers launched with the same subnet id to talk to one another? Currently, they can ssh to each other, but they cannot ping - even though I have opened up all firewall rules.

enter image description here

ssh

1 Answers

  1. Best Answer

    Ping uses the ICMP protocol, not TCP.

    ICMP

    Routing tables are not involved in intra-subnet communication, unless you meant security groups.

    • 4