From: Guyler, Rik (rguyler@shp-dayton.org)
Date: Thu May 26 2005 - 08:55:56 GMT-3
I will be in the minority here and not guess busy DNS servers. I have never
had a DNS timeout issue in this configuration. However, what I have seen
mulitple times is an MTU problem, especially with WinXP/2003.
I suggest downloading one of the many tools or directly modifying the
registry to change the MTU down to a smaller size on the workstation(s)
and/or server. The DNS queries are small so they shouldn't be a problem so
a good test here is to ping by name a site you can't open in the browser.
Rik
-----Original Message-----
From: Sam Joseph [mailto:samjoseph747@hotmail.com]
Sent: Wednesday, May 25, 2005 8:09 PM
To: ccielab@groupstudy.com
Subject: OT --- Peculiar DNS Problem
Hi Guys, Have peculiar DNS Behaviour. Here is the Detail:
Have a 1700 Series with ADSL Card For Internet Access. Have Windows 2003 DNS
Server functioning as a forwarder. The Windows 2003 DNS will forward the DNS
requests, to ISP's DNS Server for internet name resoultion.
Below is a simple topology shown
ISP ------ 1700 ADSL --- Cisco 2950 Switch ------ Windows 2003 DNS Server
and Clients.
Problem:
The Problem is can't visit most websites.
When I try to ping www.cisco.com, it works fine. If try to visit
http://www.cisco.com, it timesout. However, can visit
http://www.ciscopress.com website. The 1700 Series has firewall feature set.
We are yet to turn on FW functions on 1700.
Any insight is appreciated.
Thanks
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