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Re: why upload with adsl is faster than 100M ethernet ?

  • From: Marc Binderberger
  • Date: Fri Oct 15 05:34:15 2004

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:


the network path is:

customer/                 --Edge_router---...---Japan

So, from edge_router to Japan server the path is

Regards, Marc
Marc Binderberger    <[email protected]>