source and destination in ipv4 instead of ipv6

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Unfortunately I do not understand your question. Could you explain it a bit more?

If all of your network traffic uses IPv6 rather than IPv4, you wan't see any IPv4 because there isn't any IPv4. Is there any IPv4 traffic on your network?

SIN-bit, capita a volte, sprattutto nei domain controller che ci sia in dns sia l'indirizzo ipv4 del comain controller sia l'indirizzo ipv6 dello stesso, vorrei sapere, wireshark può convertire da ipv6 in ipv4 per facilità di comprensione?

Via Google Translate:

SIN-bit, it sometimes happens, especially in domain controllers that in DNS there is both the ipv4 address of the comain controller and the ipv6 address of the same, I would like to know, can wireshark convert from ipv6 to ipv4 for ease of understanding?

(Presumably "SIN-bit" means "SYN-bit", which is Sake Blok's handle on ask.wireshark.org.)

it sometimes happens, especially in domain controllers that in DNS there is both the ipv4 address of the comain controller and the ipv6 address of the same, I would like to know, can wireshark convert from ipv6 to ipv4 for ease of understanding?

"Convert from IPv6 to IPv4" in what sense?