Re: maximum data over link

[Bowie Owens <bowie owens csiro au>]

Bart Vanherck wrote:

> Hello,
>
> I did some tests with some use data buffers. (See also my previous
> mail). I investigated this and found that there is a define
> GIOP_INITIAL_MSG_SIZE_LIMIT which is default the value 256*1024
>
> Is there any reason why this is this value ?
>  
As I understand it, the purpose of GIOP_INITIAL_MSG_SIZE_LIMIT is to 
prevent a DOS attack from consuming memory on a server via large invalid 
messages. The first time a server receives a valid message it is 
supposed to record that the client is legit and ignore the size of the 
messages from then on. So you can send a short "hello" message to the 
server and then after that send messages of any size. A while ago ORBit 
was always applying the size limit. I don't know if it still does this 
as I ended up working around the problem using the command line argument:

--ORBInitialMsgLimit=4000000000

Michael, correct me if I got any of this wrong.


--
Bowie Owens

CSIRO Mathematical & Information Sciences
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