setfib — execute a
    utility with an altered default network view
  
    setfib | 
    [-F] fib
      utility [argument ...] | 
  
The setfib utility runs another
    utility with a different routing table. The table
    number fib will be used by default for all sockets
    started by this process or descendants.
The PATH environment variable is used to
    locate the requested utility if the name contains no
    ‘/’ characters.
If utility is invoked, the exit status of
    setfib is the exit status of
    utility.
An exit status of 126 indicates utility was
    found, but could not be executed. An exit status of 127 indicates
    utility could not be found.
Run
    netstat(1)
    to view the second routing table.
setfib -F 1 netstat -rn
or
setfib 1 netstat -rn
or
setfib -1 netstat -rn
The setfib utility is a
    FreeBSD specific extension. However, many
    UNIX-like systems have an equivalent function.
The setfib utility appeared in
    FreeBSD 7.1.