Re: [Help-gnunet] INDIRECTION_TABLE_SIZE

[Christian Grothoff]

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On Saturday 10 August 2002 05:05 pm, Thomas Formella wrote:
> Hello,
>
> would somebody please so kind to explain the following log message:
>
> ROUTING: You may want to increase INDIRECTION_TABLE_SIZE.
> The current limit 8092 was hit.
> indirection table full - not indirecting!
> ROUTING: You may want to increase INDIRECTION_TABLE_SIZE.
> The current limit 8092 was hit.
> indirection table full - not indirecting!

Every node must keep track of queries that it forwarded to prevent queries
from looping and to be able to route replies back to the node that asked the
question in the first place. For this, GNUnet uses an 'indirection table'. If 
the size of the indirection table is too small compared to the number of 
queries that your node could route (which is also limitetd by the amount of 
bandwidth that you specify), than your node will have to drop queries that it 
may otherwise forward to other nodes.

Note that the message above is just a warning, the node is operating just 
fine. The warning just indicates one place where the node may operate more
efficiently. The limit of 8092 entries is also limiting the degree of 
anonymity your node can achieve when facing a strong adversary (the number of 
messages that you can route simultaneously is 8000, thus the adversary has to 
identify your message(s) in "only" up to 8000 other messages).

Other than ignore the 'warning' (which is perfectly feasible), currently your 
best chance is to increase the indirection table size (in 
src/include/config.h). In the future, I would like to see the table grow 'if 
memory constraints permit it'.

Christian
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