Re: netcat delays between pages over wan

From: Bill Vermillion (bv_at_wjv.comREMOVE)
Date: 03/27/04 

Date: Sat, 27 Mar 2004 15:05:11 GMT

In article <c16a60hs4f99lv9f502sf755v218fdluo8@4ax.com>,
Jeff Liebermann <jeffl@comix.santa-cruz.ca.us> wrote:
>On Fri, 26 Mar 2004 18:30:48 -0500, Gary Quiring <gquiring@msn.com>
>wrote:
>
>>I narrowed down the problem. I use EPS2 servers on my side of the WAN
>>with no issues. The other side of the WAN they are using EPS2-100
>>servers. The main difference with them is just 100 MPS ability which
>>I think is useless for printing. The printer will always be slower
>>than the data.
>>
>>I installed an EPS100 on my side and I have delays between the pages
>>on PCL documents. Pure text no delays, with PCL 30 second delays
>>between each page!!
>>
>>I see no commands to control the duplex or speed of the interface on
>>the print server. I emailed Lantronix and will wait until Monday and
>>will call if I don't get any repsonse or usefull help.

>http://www.lantronix.com/products/ps/eps2_4100/
>Latest firmware is 3.6/4. Might be worth checking.

>What's the EPS2-100 plugged into (besides the printers)? It might be
>that the NWAY ethernet protocol negotiation is getting mangled.
>Nothing like one end playing full-duplex while the other end is doing
>half-duplex. Packet loss might explain the delays, but I would
>suspect it would cause hangs instead of delays. If you wanna force it
>to 10baseT, then just put a 10baseT hub in between the EPS2-100 and
>whatever it's plugged into.

Quite often duplex mis-matches give very slow transmit time
but not hangs. That's because one side is using HDX which by
definition uses collision sensing to see if the 'coast is clear' ,
and the FDX side never bothers to look for anything on the line as
it knows it can transmit anytime it wants. So it is transmitting
when the other side is trying to transmit, and that
results in damaged packets and retransmissions. 

-- 
Bill Vermillion - bv @ wjv . com

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