[74827] in North American Network Operators' Group
Re: why upload with adsl is faster than 100M ethernet ?
daemon@ATHENA.MIT.EDU (Marc Binderberger)
Fri Oct 15 05:31:18 2004
In-Reply-To: <20041015081411.65064.qmail@web53608.mail.yahoo.com>
Cc: NANGO <nanog@merit.edu>
From: Marc Binderberger <marc@sniff.de>
Date: Fri, 15 Oct 2004 11:30:35 +0200
To: Joe Shen <joe_hznm@yahoo.com.sg>
Errors-To: owner-nanog-outgoing@merit.edu
Hi Joe,
"divide et impera" :-)
Put a (FTP-)server in _your_ network to get an idea if the problem is
with the edge device (or somewhere in your network) or on the WAN to
Japan.
The PING may not tell you much about short-term queue problems in a
device. As Mikael Abrahamsson wrote use a sniffer (Ethereal, tcpdump,
...) and search for retransmissions, i.e. some "breaks" in a monotonic
increasing sequence number sequence or such.
We had a similar issue when E1 customers had been fine but customers on
the same router with 10Mbit/s and above complained. Took us some
memory/queue fine-tuning of the 7500 box to get it right, traffic on
the higher speed link probably was more "bursty" and this flooded some
buffers then.
On Oct 15, 2004, at 10:14 Uhr, Joe Shen wrote:
>
> Hi,
>
> the network path is:
>
>
> |-(ADSL)--------\
> customer/ --Edge_router---...---Japan
> Server
> \-(100Methernet)-/
>
>
> So, from edge_router to Japan server the path is
> identical.
>
Regards, Marc
--
Marc Binderberger <marc@sniff.de>
