By using AWS re:Post, you agree to the Terms of Use

What will Route53 do if client ip matches multiple CIDR blocks in different CIDR Locations?

0

I haven't found behavior of Routing policy IP-based that a client ip matches 2 or more CIDR blocks in different CIDR Locations.

For an example, domain: abc.com

Record NameRouting PolicyCIDR LocationEntry Value
geo.abc.comIP-basedCIDR-Location-1198.51.100.1
geo.abc.comIP-basedCIDR-Location-2198.51.100.2

and we have 2 CIDR Locations in CIDR Collection

CIDR LocationCIDR Blocks
CIDR-Location-11.1.1.0/24
CIDR-Location-21.1.0.0/16

Question: When the client (ip 1.1.1.1) trys to resolve geo.abc.com, what result will he get?

2 Answers
0

Not sure what you meant by: "CIDR-Location-1 contains CIDR Block 1.1.1.0/24 CIDR-Location-1 contains CIDR Block 1.1.0.0/16" You will just have 1.1.0.0/16 spanning your VPC, so...

As for "Record 1: geo.abc.com, CIDR-Location-1, A record to 198.51.100.1 Record 2: geo.abc.com, CIDR-Location-2, A record to 198.51.100.2" You configure your DNS with multiple A records for the same FQDN - the requests would get served in round-robin.

answered a month ago
0

I see you added more input/clarification. Here is what I tested:

  • 2 separate VPC in us-east-1 (one with 10.1.0.0/16 and the other with 10.1.1.0/24)
  • Created a Private hosted zone and associated with the 2 VPC above.
  • Spun 2 hosts in each of the VPC with manual assigned IP (.10)
  • nslookup and response was served in round robin, sometime getting the same IP.
answered a month ago

You are not logged in. Log in to post an answer.

A good answer clearly answers the question and provides constructive feedback and encourages professional growth in the question asker.

Guidelines for Answering Questions