NACL with

I have two EC2 instances within two VPCs.

so the original NACL of a public subnet with instance 2 associated with is something like : 

All ICMP - 10.0.0.0/0  ALLOW


and I can ping instance 2 from instance 1(10.1.0.71).


when I changed NACL to below, I expect I can still ping instance 2 from 1  but ended with timeout.

All ICMP - 10.0.0.0/13 ALLOW


What is happening?


Thanks,



  • post-author-pic
    Adrian C
    09-29-2018

    Hi Leon - i think were going to need additional info to help. Is this two VPC's with a VPC peer? i'm assuming so given the different IP address ranges.


    I'm trying to understand what you intended to write in the bottom half but i can't make sense of it.

    Can you maybe just add more detail and exactly whats happenign and ill see what i can do.

  • post-author-pic
    leon800219-fd89f932
    09-29-2018

    I was following the "Learning Activity: Implementing VPC Peering on AWS" of CSA-A course.


    My question comes from first part of the demo and It just doesn't make sense to me.

    Thanks,

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