A quick look at permfunc:bind gives the following information.

bind SOCKET,NAME
Binds a network address to a socket, just as the bind system call does
+. Returns true if it succeeded, false otherwise. NAME should be a pac
+ked address of the appropriate type for the socket. See the examples 
+in Sockets: Client/ Server Communication in the perlipc manpage
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You can find the reference in the above here. It contains several good examples.

It also has this rather interesting comment:

If you ever see code that does anything like explicitly setting $AF_IN
+ET = 2, you know you're in for big trouble: An immeasurably superior 
+approach is to use the Socket module, which more reliably grants acce
+ss to various constants and functions you'll need.
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This can be found here Socket though it is quite likely that this is a part of your stadard distribution It is in mine.