[nsp] Large Number of small packets --> timeout over frame relay, IGX, ATM

[Michael Axelrod]

I remember similar problems with small packets over UFM-UFM connections.
Scott, do you recall that?
I would start with looking at the firmware versions on your UFM cards and
trunk cards and getting that up to date.
Good luck,
Mike Axelrod
----- Original Message ----- 
From: "Scott Weeks" <surfer at mauigateway.com>
To: <cisco-nsp at puck.nether.net>
Sent: Tuesday, March 30, 2004 1:32 PM
Subject: Re: [nsp] Large Number of small packets --> timeout over frame
relay, IGX, ATM


>
>
> Hello Everyone,
>
> Comments inline...
>
> On Tue, 30 Mar 2004, Hans-Peter Walter HAWA wrote:
>
> : one of our branch offices tries to connect to a self-written application
> : in our main data center. It works, but long response times and timeouts.
> <snip>
> : on a Cisco 3640 in a firewall DMZ. All other applications works fine. No
> : CPU problems, no Access-lists,  only a little bit of NAT. I had the IGX
> ; in mind, so we changed all
>
> Why did you have the IGX in mind?  If it was the backbone, all apps
> on the same PVC would show the same symptoms.
>
>
> : found out, that the client only sends packets with a MTU size of 50 - 70
> : instead of 1500.
> :
> : So I routed only the one application (-server) over an existing VPN
(Cisco
> : VPN Concentrator)  to our data center, and the connection works better,
> : but not perfect. Response time is O.K. now, but now we have sudden
> : connection failures  (well, it's over the Internet, I know)...
>
> Yes, that's why you have the connection drops, it's over the internet.
>
>
> : So the only solution is to solve the frame relay, ATM, IGX or whatever
> : problem. But I don't know where to start. I read several newsgroups,
> : articles and googled for it, but absolutely no result. The developers
> : can't change the MTU, so that is not an option.
>
> If they can't change the MTU, you're screwed.  Perhaps you could create a
> PVC just for the app and play with it (the PVC that is... ;) until you
> get it good enough.  However, if you're trying to do ATM w/o much
> experience, you might do more damage than good.  Seen that happen...
>
> scott
>
>
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