random IP seq numbers

[Martin F Krafft <madduck@madduck.net>]

i get this from nessus on one of our hosts:

>  . Warning found on port general/tcp
>     
>     The remote host uses non-random IP IDs, that is, it is
>     possible to predict the next value of the ip_id field of
>     the ip packets sent by this host.
>     
>     An attacker may use this feature to determine if the remote
>     host sent a packet in reply to another request. This may be
>     used for portscanning and other things.
>     
>     Solution : Contact your vendor for a patch
>     Risk factor :
>      Low

how can i make linux tcp/ip use random IP sequence numbers?

martin;              (greetings from the heart of the sun.)
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