(Message mtu:1) Date: 30 Nov 1997 23:45:48 MST From: Franck Martin Newsgroups: comp.dcom.sys.cisco Subject: Cannot reach sites with MTU<1500 Approved: news@news.colorado.edu X-Return-Path: dhesi@rahul.net X-Nojunk-Status: OK 0 Organization: University of Colorado at Boulder Sender: daemon@lace.colorado.edu Distribution: world Nntp-Posting-Host: lace.colorado.edu Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" X-Priority: 3 X-Mailer: Internet Mail Service (5.0.1458.49) X-Note1: message-id generated by recnews X-Note2: mail msgid was Xref: samba.rahul.net comp.dcom.sys.cisco:41013 I had this strange problem with a very few sites on the net: www.hotmail.com www.compaq.com www.ausaid.gov.au The connection to my ISP is very slow 9600bps, therefore at these speeds it is better to put an MTU of 576 for better usage, I set it up on my CISCO 2500 on the serial port. Unfortunately, I was not able to browse these particular sites, but I had no problem with 99.9% of the INTERNET web sites. I set the MTU to 1500 and everything went fine. Please note that I did it at the same time as my ISP did it. I wrote to the webmaster of these sites, and so far only one answered me letting me know that they use a cisco local redirector. It seems that these few sites set the don't fragment flag in their packets, which is highly strange, or is it the cisco local redirector which has got this behavior? If anyone can bring the light on this issue. Cheers. Franck Martin Database Development Officer SOPAC South Pacific Applied Geoscience Commission Fiji E-mail: franck@sopac.org.fj Web site: http://www.sopac.org.fj/