# Client on IPv6 NAT can only complete ICE with send transports

**URL:** <https://mediasoup.discourse.group/t/client-on-ipv6-nat-can-only-complete-ice-with-send-transports/2702>\
**Category:** Deployment & Scalability\
**Created:** [April 17, 2021, 2:15pm UTC](https://mediasoup.discourse.group/t/client-on-ipv6-nat-can-only-complete-ice-with-send-transports/2702 "2021-04-17T14:15:06Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![ibc](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/ibc/32/1540_2.png) [@ibc](https://mediasoup.discourse.group/u/ibc)\
**Post date:** [April 17, 2021, 3:57pm UTC](https://mediasoup.discourse.group/t/client-on-ipv6-nat-can-only-complete-ice-with-send-transports/2702/8 "2021-04-17T15:57:51Z")

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Makes sense. mediasoup selects a tuple based on the **last** ICE candidate it receives from the client. It may change dynamically. And mediasoup replies to those candidates using the same tuple but, obviously, it doesn’t know whether the client received the response (it should if the networking is ok).

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