Re: [LARTC] speed problem

[ulrich schwarz <ulrich.schwarz@rz.uni-ulm.de>]

Vishal Gandhi Kommineni wrote:
> Hi all,
> I have a pecular problem
>  
> i have a setup of 3 linux boxes and a windows pc
>  
> boxes A, B, C and a pc are connected in the follwoing sequence
>  
>  
> A (eth0)< ----> (eth0)  B  (eth1)< -----> (eth0) C (eth1) <------> PC
>  
>  
> 1) using ftp I am able to transfer data from B to A both ways, the 
> speeds are around 1.2e
> 2) I am also able to transfer similarly to and fro from B to PC  via box C
>  
> but
>  
> 3) when i am trying to ftp data from A to PC via B and C to and fro the 
> data transfer speed has drastically come down,
> Please note that in both B and C ipforward is enabled.
>  
> Kindly help
>  
> Thanks in advance,
>  
> Vishal Gandhi


hi vishal,

the first thing i'd like to check is if the ethernet cards are running 
in full- or half-duplex mode. AFAIK running one card in half-duplex mode 
and the other trying to force full-duplex mode can lead to lots of 
collisions, so this could be a reason for slow speed.

you could use a hub or switch instead of the crossover cable and watch 
the collision LED (if there is any *g*).

greetings,

ulric

-- 
ulrich schwarz, computing center, university of ulm, germany


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