Re: HTTP Stack, MTU And Fragmentation

[email protected] wrote:

>If my domino http server receives some client requests that causes some 
>Austrian Telekom Router (Region of Vienna/Austria ) to fragment those 
>server sent packages wrongly for the requesting client my domino http 
>server dies.
>
>  
>
Does that mean the http task hangs and wont recover? Do you have to 
restart the server then? Or does the client just not receive the HTML file?

>On limiting the client's MTU size down to 1242 (default 1500) everything 
>works fine.
>  
>
What happens when you limit the MTU on the _server_ to say, 1400? ... 
ifconfig eth0 mtu nnnn

>I presume the router(s) to be the problem but i want to manipulate my 
>domino's behavior to limit fragmentions of the packages itself, get the 
>client a definite MTU size or something like that.
>Connections and requests from other ISPs work fine and without any 
>problems.
>  
>
You can't. You can only limit the servers MTU. Clients figure out the 
MTU themselves ( the routers are, to be more exact by means of MTU 
discovery). In a perfect world, this always works. Since we don't live 
in a perfect world, some routers implement MTU discovery wrong. Check 
your setup with this tool http://trackzapper.com/booster.html . 
Unfortunately, only on Windoze.

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