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<H2><A NAME="s6">6. Adding features to IP</A></H2>
<P>If you have read the previous section, you can now embark on adding new
features to how JNS handles IP packets, for example multicasting. The source
file you want to modify for this is <B>jns.elements/IPHandler.java</B>. For
most purposes, you do not need to modify the link or interface files. Actually,
for most purposes should only have to modify the <CODE>update()</CODE> function
of the <CODE>IPHandler</CODE> class because that is the bit of code that takes
care of routing packets, sending them, forwarding them to higher level
protocols, etc.
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<P>There are two loops in this function: One that processes all packets waiting
to be sent. You will want to edit this if you want to make more complex
routing decisions, provide cleaner fragmentation, etc. The other loop processes
all packets that have been received and are either waiting to be sent on
or waiting to be given to higher-level protocols or which were received
erroneously and have to be discarded. You might have to edit this if, for
example, you did provide some complex fragmentation code, because you will
have to reassemble packets in a complex way then, right here. (By the way,
there IS fragmentation support in JNS, you can see it right there).
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