# Internode communication in ES

**URL:** <https://discuss.elastic.co/t/internode-communication-in-es/245207>\
**Category:** Elasticsearch\
**Tags:** elastic-stack-security\
**Created:** [August 17, 2020, 9:41am UTC](https://discuss.elastic.co/t/internode-communication-in-es/245207 "2020-08-17T09:41:10Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![baidwan007](https://avatars.discourse-cdn.com/v4/letter/b/34f0e0/32.png) [@baidwan007](https://discuss.elastic.co/u/baidwan007)\
**Post date:** [August 17, 2020, 9:41am UTC](https://discuss.elastic.co/t/internode-communication-in-es/245207/1 "2020-08-17T09:41:10Z")

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1. Is there any type of authentication that is required for ES nodes to communicate with each other? So in the communication between master nodes and data nodes is there any auth happening without which they wont be able to communicate and new nodes would not be able to add to the cluster?
2. If yes then is it related to authentication realms in ES?

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**Author:** ![ikakavas](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ikakavas/32/34430_2.png) [@ikakavas](https://discuss.elastic.co/u/ikakavas)\
**Post date:** [August 17, 2020, 10:05am UTC](https://discuss.elastic.co/t/internode-communication-in-es/245207/2 "2020-08-17T10:05:30Z")

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> [@baidwan007](#):
>
> Is there any type of authentication that is required for ES nodes to communicate with each other?

Yes, nodes are authenticated to each other with mutual TLS authentication in [the transport layer](https://www.elastic.co/guide/en/elasticsearch/reference/current/configuring-tls.html#tls-transport).

> [@baidwan007](#):
>
> If yes then is it related to authentication realms in ES?

No. Authentication realms are for users/clients connecting to Elasticsearch ( via the HTTP layer ).

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [September 14, 2020, 10:05am UTC](https://discuss.elastic.co/t/internode-communication-in-es/245207/3 "2020-09-14T10:05:52Z")

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Closed on September 14, 2020, 10:05am UTC

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