Hello I have Ltap mini with Lte modem. My Lte ISP giving my ipv6 address and what I need to setup to ping ipv4 address?
P.S. My phone also having ipv6 address via same Lte ISP and I can ping ipv4
Providers initially offered IPv6+IPv4 dual stack, it is becoming more common for them to only implement IPv6 and use one of the many tunneling mechanisms for IPv4 - see https://www.rfc-editor.org/rfc/rfc9313.html for information on the most prominent ones.
It is possible to configure DS-Lite on Mikrotiks, if that is what your provider uses. The other mechanisms are not possible as the required functionality is missing from RouterOS, but work on mobile phones as support is included in android & iOS.