[Click] head- and tailroom

[David Biot]

Hello,

My click-router adds an IP-header in front of every packet and appends 4
bytes of data to the end of the packet.

Now I sometimes get a message like
expensive Packet::push; have 12 wanted 14
or
expensive Packet::put; have 0 wanted 4

Now I understand that this means that there isn't enough head- and tailroom
to add the required data. All in all it's probably not all too important
because I don't get a lot of these warnings. I get 5 times