Configuring the Junos OS to Enable Processing of IPv4-mapped IPv6 Addresses
By default, the Junos OS disables the processing of IPv4-mapped IPv6 packets to protect against malicious packets from entering the network. This might result in IPv6 packets from being dropped in a pure IPv4 routing environment. In a mixed routing environment of IPv4 and IPv6 networks, you might want to enable the processing of IPv4-mapped IPv6 packets to ensure smooth packet flow. In addition, this might also be helpful when you are in the process of transitioning your routing environment from IPv4 to IPv6 networks.
To enable the processing of such IPv4-mapped IPv6 packets, include the allow-v4mapped-packets statement at the [edit system] hierarchy level:
 | Note: We recommend that you configure this statement only after fully understanding the security implications of allowing IPv4-mapped IPv6 packets in your network. |
