ElasticSearch IPv6

Elastic Stack Elasticsearch
2

Somewhat confusingly tcp6 refers to the mixed IPv4 and IPv6 stack, as you can see from this line which has an IPv4 address:

tcp6 0 0 10.0.0.12:9300 :::* LISTEN 1040/java

This line means it’s listening on all interfaces:

tcp6 0 0 :::9200 :::* LISTEN 1040/java

Please read these docs carefully for further information, noting in particular:

It is usually a mistake to use 0.0.0.0 as a publish address on hosts with more than one network interface.