S01.    Store the IPv6 DA and SA in buffer memory
S02.    Pop the IPv6 header and all its extension headers
S03.    Push a new IPv4 header with a UDP/GTP-U header
S04.    Set the outer IPv4 SA and DA (from buffer memory)
S05.    Set the outer Total Length, DSCP, Time To Live, and
           Next Header fields
S06.    Set the GTP-U TEID (from buffer memory)
S07.    Submit the packet to the egress IPv4 FIB lookup for
           transmission to the new destination