Which methods are used for encapsulating IPv6 packets within IPv4 packets?

Tunneling protocols are specifically designed to encapsulate one type of packet within another, enabling communication across networks with different protocols. In the context of encapsulating IPv6 packets within IPv4 packets, tunneling protocols create a virtual connection that allows the IPv6 data to be transported over an IPv4 infrastructure. This is particularly essential for transitioning from IPv4 to IPv6, as it ensures compatibility and continuity of communication between systems using different IP versions.

Tunneling can take various forms, such as Generic Routing Encapsulation (GRE) or 6to4, both of which allow for the transmission of IPv6 traffic over an IPv4 network. By utilizing these protocols, organizations can facilitate IPv6 deployment without requiring an immediate overhaul of their existing IPv4 network infrastructure.

Other methods, such as bridging, primarily deal with connecting two or more network segments at the Data Link layer and do not directly address the encapsulation of one protocol within another. Routing protocols focus on directing data packets from one network to another rather than encapsulating different packet types. Encapsulation techniques can refer to a broader concept that includes tunneling but is not as specific in this context, making tunneling protocols the most precise answer for encapsulating IPv6 packets within IPv4 packets.