Re: Dropped packets via ISR


amattina@xxxxxxxxx wrote:
SETUP
Cisco 2811 ISR on 4mbit metro ethernet.
~200 users

Problem
Web pages are coming up either
a) perfectly
b) half mangled with some images and screwed up tables or
c) not at all

There is no pattern as to when or why a page might not come up. Most of
this happens at lunchtime while people sit at their desks and browse.
More usage = more of

I realize that retransmissions are normal, and this is what a normal
loss/retransmit should look like(taken from my home and office

I've troubleshot this down to the ISR and provider uplink. The
provider from their NOC said that everythign on the line looked good
and we don't have a ton of dropped packets on the ISR which one might
expect. Any ideas? I've been working on this for weeks.

What do you get from more basic tools:-

ping, traceroute.

The packet loss rate shown in the traces is not
normal, i.e. about 1 in 10 or 20.

What I would do is:-


1 - check the interface stats on all network kit in the path
that you can reach. Post the output here if you wish.
sh int

2 - Use traceroute with a lot of repetitions for a long
time to verify each hop in the path to the internet.
Pingplotter makes this a breeze.

If you use pingplotter set the repition rate to 1sec and
leave it running over a failure.

Post results.

3 - Check that you are not having an MTU issue I guess
would be an idea.

If that does not lead anywhere then we can have a look
at the Ethereal dumps. 'cos that takes more brainpower.

.