From: Robert Rech (brech@kc.rr.com)
Date: Fri Oct 17 2003 - 01:42:22 GMT-3
This is most likely caused by an MTU mismatch somewhere in the path, and
your client is probably blocking all incoming ICMP traffic.
Have them ping with various sizes and the DF bit set. If at some point the
ICMP times out then this is the problem.
Easiest way to test is on a router do an extended ping, answer yes to the DF
bit on, use a sweep size from 1300 to 1500. If you time out have them allow
icmp destination unreachable messages in through the firewall.
----- Original Message -----
From: "Mohan" <Mohan@vads.com>
To: <ccielab@groupstudy.com>; <cisco@groupstudy.com>
Sent: Thursday, October 16, 2003 10:05 PM
Subject: ping and trace-route successful but www failing
> Dear all, we're a ISP and one of my customers is experiencing a strange
> problem accessing www.yahoo.com. They're able to ping and trace-route (IP
> address & DNS) to the site but not WWW. When the URL is entered, the
browser
> attempts to load the page but fails and returns an error: page cannot be
> displayed or not available.
> Other customers connected to us are not experiencing this problem, we
even
> tried bypassing customer firewall by connecting our laptop directly to the
> internet router Ethernet port, but the problem persisted. This might not
be
> an internet routing problem as other customers are not experiencing
similar
> problem, only this one particular customer. We even tried swapping a new
> C1721 running 12.2(11)T but that didn't help either. The problem only
> started last week, before that they were able to access the website.
> Just wonder if any one of you has came across a similar problem... any
help
> or advice is much appreciated.
>
> Cheers,
>
> Mohan
>
>
>
> ---
> Outgoing mail is certified Virus Free.
> Checked by AVG anti-virus system (http://www.grisoft.com).
> Version: 6.0.524 / Virus Database: 321 - Release Date: 10/6/2003
>
> _______________________________________________________________________
> Please help support GroupStudy by purchasing your study materials from:
> http://shop.groupstudy.com
>
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
This archive was generated by hypermail 2.1.4 : Mon Nov 24 2003 - 07:53:03 GMT-3