Re: [IPCop-user] Slow FTP between Green and Orange networks

[Sage T. P. L. <ro...@sa...>]

> At 05:32 PM 3/29/2002, Sage Telecommunications Pty Ltd wrote:
> >I've been experimenting with an IPCOP network setup and have been having
> >problems with very very slow FTP transfers from a server on the green
> >network to the a server on the orange network.
> >All of this is on a 10MB n/w
> >The target machine is a 486dx66 hence the slowish xfer rate.
> >The source machine is a pentium 450
> >The ipcop machine is a 486dx40 with three 3com509 n/w cards
>
> Here are some ideas:
> 1) The 486dx40 may be a bit underpowered for the task (normally people
> using a box such as this are only protecting their relatively slow ISP
> connection not routing between two home networks).

I did check that early on but forgot to mention it. CPU load is is ok

>
> 2) Network hardware settings (duplex settings etc):
>
> transfer has been running for a while.  If the errors, dropped,  overruns,
> and collisions is increasing significantly a poorly configured network may
> be causing retransmissions.

I was suffering from overrun errors on the incoming RX port on the ipcop
machine.

I eventually tracked the problem down to the 3com 3c509 cards. Everyone on
both the ipcop machine and the server was suffering from rx overruns.
Replacing the cards with ne2000 clones has resolved the overun issue and
subsequently the low xfer rate.
I'll investigate further as I don't believe that the 3com cards are that
bad.

http://www.linux.org.au/LDP/HOWTO/Ethernet-HOWTO-3.html gave me the further
clues to resolving the problem.
I'll play with the rx window parameter and see if I can tume the problem
out.

Thanks Bob for the pointers.
rgds
Rod