!! internal nat server
FB12-tips

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! boot/loader.conf

 ####
 ipfw_load="YES"
 ipfw_nat_load="YES"
 ipdivert_load="YES"
 ####
 dummynet_load="YES"
 libalias_load="YES"
 ####
 if_lagg_load="YES"
 ####
 ####
 ####
 
 # FreeBSD 9+
 # New Congestion Control for FreeBSD
 cc_htcp_load="YES"
 #cc_cubic_load="YES"
 
 # Sendfile buffers
 # Note: i386 only
 kern.ipc.nsfbufs=10240
 
 # syncache tuning
 net.inet.tcp.syncache.hashsize=32768
 net.inet.tcp.syncache.bucketlimit=32
 net.inet.tcp.syncache.cachelimit=1048576
 
 # Very useful for it's RTT RTTVAR
 # Must be power of two
 net.inet.tcp.hostcache.hashsize=65536
 # hashsize * bucketlimit (which is 30 by default)
 # It allocates 255Mb (1966080*136) of RAM
 net.inet.tcp.hostcache.cachelimit=1966080
 
 # TCP control-block Hash table tuning
 # See: http://serverfault.com/questions/372512/why-change-net-inet-tcp- tcbhashsize-in-freebsd
 net.inet.tcp.tcbhashsize=524288
 
 #
 # FreeBSD 9.x+
 # Increase interface send queue length
 # See commit message http://svn.freebsd.org/viewvc/base?view=revision&  revision=207554
 net.link.ifqmaxlen=1024
 
 # IPC prametor
 kern.ipc.msgmnb=8192
 kern.ipc.msgssz=64
 kern.ipc.msgtql=2048
 #### #### #### ####
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