Followup to an older post.
In 18.06.2 the 6in4 tunnel would work with dynamic IPV4 address only if the SSL library was mbedtls
After upgrading to 19.07, I tried replicating the issue by removing libustream-mbedtls20150806 and replacing it with libwolfssl24 / libustream-wolfssl20150806.
It works... but now "curl" is only linking mbedtls so this is to be expected, right?
Am I correct if I say the issue was side-stepped?