libnet6-1.3-dev 1:1.3.6-1 (i386 binary) in ubuntu intrepid

 net6 is a library which eases the development of network-based applications
 as it provides a TCP protocol abstraction for C++. It is portable to both
 the Windows and Unix-like platforms.
 .
 These are the development files for net6, needed only if you wish to write
 or compile software which uses it.