[Bug 229006] ipfw+nat and ng_nat Silently Drop Packets over 4k

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229006

--- Comment #3 from commit-hook at freebsd.org ---
A commit references this bug:

Author: ae
Date: Thu Jun 14 11:15:40 UTC 2018
New revision: 335133
URL: https://svnweb.freebsd.org/changeset/base/335133

Log:
  In m_megapullup() use m_getjcl() to allocate 9k or 16k mbuf when requested.

  It is better to try allocate a big mbuf, than just silently drop a big
  packet. A better solution could be reworking of libalias modules to be
  able use m_copydata()/m_copyback() instead of requiring the single
  contiguous buffer.

  PR:           229006
  MFC after:    1 week

Changes:
  head/sys/netinet/libalias/alias.c

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