# Unicast pinging to specific ips got issue

**URL:** <https://discuss.elastic.co/t/unicast-pinging-to-specific-ips-got-issue/35389>\
**Category:** Elasticsearch\
**Created:** [November 24, 2015, 8:15am UTC](https://discuss.elastic.co/t/unicast-pinging-to-specific-ips-got-issue/35389 "2015-11-24T08:15:48Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Phani\_Nadiminti](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/phani_nadiminti/32/45381_2.png) [@Phani\_Nadiminti](https://discuss.elastic.co/u/Phani_Nadiminti)\
**Post date:** [November 24, 2015, 8:15am UTC](https://discuss.elastic.co/t/unicast-pinging-to-specific-ips-got-issue/35389/1 "2015-11-24T08:15:48Z")

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Hi All,

I disabled multicast on production and enabled unicast to specific hosts in my cluster today i have observed that one node is accidentally added to my prod cluster is there any specific reason for this .please explain me once.ES version is 1.5.2

The following is my configuration :

```
 discovery.zen.ping.unicast.hosts: ["ip1","ip2","ip3"]

```

Thanks  
phani

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**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\
**Post date:** [November 25, 2015, 12:28am UTC](https://discuss.elastic.co/t/unicast-pinging-to-specific-ips-got-issue/35389/2 "2015-11-25T00:28:25Z")

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Did you disable multicast and change the cluster name?

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**Author:** ![Phani\_Nadiminti](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/phani_nadiminti/32/45381_2.png) [@Phani\_Nadiminti](https://discuss.elastic.co/u/Phani_Nadiminti)\
**Post date:** [November 25, 2015, 8:06am UTC](https://discuss.elastic.co/t/unicast-pinging-to-specific-ips-got-issue/35389/3 "2015-11-25T08:06:24Z")

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Hi Mark,

No, I came to know that the nodes which are joined accidentally to cluster don't have multi cast disabled and they have same cluster name. let's say other nodes are joined because of these properties but I have defined in existing cluster that connect to these nodes only and disabled multicast too.so it should not ping the other nodes right other than specified ones ? Am i correct? please suggest me in this.

Thanks,  
phani.

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<div class="post-metadata">

**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\
**Post date:** [November 25, 2015, 9:46am UTC](https://discuss.elastic.co/t/unicast-pinging-to-specific-ips-got-issue/35389/4 "2015-11-25T09:46:46Z")

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It won't, no.  
But if there are others with multicast enabled they can still join.

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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:** [July 5, 2017, 11:36pm UTC](https://discuss.elastic.co/t/unicast-pinging-to-specific-ips-got-issue/35389/5 "2017-07-05T23:36:00Z")

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