# Unicast and multicast discovery **URL:** \ **Category:** Elasticsearch\ **Created:** [May 10, 2012, 8:58pm UTC](https://discuss.elastic.co/t/unicast-and-multicast-discovery/7644 "2012-05-10T20:58:29Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Eran\_Kutner\_2](https://avatars.discourse-cdn.com/v4/letter/e/dc4da7/32.png) [@Eran\_Kutner\_2](https://discuss.elastic.co/u/Eran_Kutner_2)\ **Post date:** [May 10, 2012, 8:58pm UTC](https://discuss.elastic.co/t/unicast-and-multicast-discovery/7644/1 "2012-05-10T20:58:29Z")
Hi, Can multicast and unicast be mixed? I have a part of a cluster running in house, where multicast is avaiable and another part running on Amazon, where it's not. What would be the best way to configure discovery in this case? Two other questions for unicast: 1) do all the servers in the cluster have to be listed or is it enough to list a few seed servers and the rest will be discovered automatically? 2) can the host list contain the server it is running on, it seems to have created problems when I tried it? Thanks, Eran ---
**Author:** ![kimchy](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/kimchy/32/44952_2.png) [@kimchy](https://discuss.elastic.co/u/kimchy)\ **Post date:** [May 13, 2012, 9:55am UTC](https://discuss.elastic.co/t/unicast-and-multicast-discovery/7644/2 "2012-05-13T09:55:23Z")
Yes, multicast and unicast can be mixed, also, you won't have problems with listing the server its running on, not sure which problems you ran into... On Thu, May 10, 2012 at 11:58 PM, Eran Kutner [eran@gigya-inc.com](mailto:eran@gigya-inc.com) wrote: > Hi, > Can multicast and unicast be mixed? > I have a part of a cluster running in house, where multicast is avaiable > and another part running on Amazon, where it's not. What would be the best > way to configure discovery in this case? > Two other questions for unicast: 1) do all the servers in the cluster have > to be listed or is it enough to list a few seed servers and the rest will > be discovered automatically? 2) can the host list contain the server it is > running on, it seems to have created problems when I tried it? > > Thanks, > Eran ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 6, 2017, 3:29am UTC](https://discuss.elastic.co/t/unicast-and-multicast-discovery/7644/3 "2017-07-06T03:29:06Z")