Nits.
 [jmk] --rw-rw-r-- M 845139 glenda sys 21677 Dec  6 09:47 sys/man/3/ip
	/n/sourcesdump/2005/1206/plan9/sys/man/3/ip:165,173 - 
	/n/sourcesdump/2005/1207/plan9/sys/man/3/ip:165,173
	  .TP
	  .BI iprouting\  n
	  Allow
	- .RI ( n is missing
	- or non-zero) or disallow
	  .RI ( n
	+ is missing or non-zero) or disallow
	+ .RI ( n
	  is 0) forwarding packets between this interface and
	  others.
	  .TP
	/n/sourcesdump/2005/1206/plan9/sys/man/3/ip:341,347 - 
	/n/sourcesdump/2005/1207/plan9/sys/man/3/ip:341,347
	  (see
	  .IR ndb (8)).
	  .B /net/ndb
	- may contain up tp 1024 bytes.
	+ may contain up to 1024 bytes.
	  .PP
	  The file
	  .B /net/ipselftab
	/n/sourcesdump/2005/1206/plan9/sys/man/3/ip:711,717 - 
	/n/sourcesdump/2005/1207/plan9/sys/man/3/ip:711,717
	  .B header
	  Turn on header mode.  Every buffer read from
	  .B data
	- starts with 4 unsued bytes, and the first 4 bytes
	+ starts with 4 unused bytes, and the first 4 bytes
	  of every buffer written to
	  .B data
	  are ignored.