* Put IPPROTO_UDP into IPv6 header.   Because conversion of IP header part is shared with TCP, default   protocol was set as TCP. * Calculate UDP checksum which was converted to IPv6.   I forgot to re-calculate it.
* Put IPPROTO_UDP into IPv6 header.
  Because conversion of IP header part is shared with TCP, default
  protocol was set as TCP.
* Calculate UDP checksum which was converted to IPv6.
  I forgot to re-calculate it.

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