[THIN] Re: Retransmission
- From: "Schneider, Chad M." <CMSchneider@xxxxxxxxx>
- To: thin@xxxxxxxxxxxxx
- Date: Thu, 3 Jul 2003 14:31:51 -0500
WE did see a lot of CRC errors, both on the router and the switch inside.
Found that the switch inside was set to auto/auto, router was 100/full.
Changed the auto/auto to 100/full, CRC errors gone on both switch and router
at one location. Other troubled location had same situation, made the
100/full change, no CRC errors on Router, but still on inside switch.
-----Original Message-----
From: Ryan Lambert [mailto:rlambert@xxxxxxxxxxxxxxx]
Sent: Thursday, July 03, 2003 2:06 PM
To: thin@xxxxxxxxxxxxx
To take out the equation of it being the frame cloud, trace out to a few
random places on the Internet and check the latency on your hops. If your
ISP is oversubscribed you'll see it.
Your router guys should be checking for frame or CRC errors on sh interface
command, and buffer failures in sh buffers command, specifically.
-----Original Message-----
From: Henry Sieff [mailto:hsieff@xxxxxxxxxxxx]
Sent: Thursday, July 03, 2003 12:57 PM
To: 'thin@xxxxxxxxxxxxx'
Subject: [THIN] Re: Retransmission
Or, they could be using any number of "traffic policing" schemes in order to
facillitate "oversubscription". Frame relay providers often do this without
telling customers, and getting the precise information can be hard. It is
also difficult to measure the impact of this quantitatively without access
to the FR core.
> -----Original Message-----
> From: Lucas Boyken [mailto:lboyken@xxxxxxxxx]
> Sent: Thursday, July 03, 2003 11:48 AM
> To: thin@xxxxxxxxxxxxx
> Subject: [THIN] Re: Retransmission
>
>
> When did you start noticing the slow down? Did you add any more
> applications to your Citrix implementation that could cause more
> bandwidth to be used? Have you tried calling your Frame-relay
> provider to see if they have any troubleshooting recourse on the
> frame-relay cloud? It could be a problem with the cloud...maybe the
> teleco is expiriencing some problems with a piece of equipment not
> transmitting properly...
>
> Respectfully,
>
>
> Lucas W. Boyken
> Computer Systems Associates
> Account Manager / Technical Representative lboyken@xxxxxxxxx Company
> Phone: 800.222.7601 Office Phone: 515.332.2751
> Fax: 515.332.5687
>
>
> -----Original Message-----
> From: Schneider, Chad M. [mailto:CMSchneider@xxxxxxxxx]
> Sent: Thursday, July 03, 2003 11:34 AM
> To: thin@xxxxxxxxxxxxx
> Subject: [THIN] Re: Retransmission
>
>
> Thanks.
>
> The more I talk with my co-workers, the more we wonder what the root
> cause is. They run SAP from there to the corporate office as
> well, and
> that has slowed along with the Citrix disconnects, which is
> what got us
> watching the link in the first place.
>
> Wondering if that link now has such high latency, that these items
> simply have to retransmit, as they are not getting through.
>
>
> -----Original Message-----
> From: Lucas Boyken [mailto:lboyken@xxxxxxxxx]
> Sent: Thursday, July 03, 2003 11:22 AM
> To: thin@xxxxxxxxxxxxx
>
> Have you tried isolating any runs with this problem. I.E. taking the
> wireless out of the equation, or the hard-wired office by
> removing them
> physically from the network? The reason I ask is that you
> could have a
> "chatty" NIC or interface out there. Also, if you have any cheaper
> devices performing NAT, try removing them as well. One more thing, if
> you can set it up to be so, remove the router from the office/wireless
> end and let it sit out on the frame-relay naked. See if removing
> equipment will help you narrow down where the potential problem is
> coming from.
>
> Respectfully,
>
> Lucas W. Boyken
> Computer Systems Associates
> Account Manager / Technical Representative lboyken@xxxxxxxxx Company
> Phone: 800.222.7601 Office Phone: 515.332.2751
> Fax: 515.332.5687
>
>
> -----Original Message-----
> From: Schneider, Chad M. [mailto:CMSchneider@xxxxxxxxx]
> Sent: Thursday, July 03, 2003 11:09 AM
> To: 'thin@xxxxxxxxxxxxx'
> Subject: [THIN] Re: Retransmission
>
>
> Here is the layout at plant A.
>
> 512K frame from corporate (frame location) to the plant.
>
> All shop floor PC's are wireless, running full client, 6.30.1050. All
> office users are wired, running NFUSE, 6.30.1050.
>
> Retransmission is high to both wireless shop floor PC's, as well as
> wired office pc's.
>
> -----Original Message-----
> From: Lucas Boyken [mailto:lboyken@xxxxxxxxx]
> Sent: Thursday, July 03, 2003 11:03 AM
> To: thin@xxxxxxxxxxxxx
> Subject: [THIN] Re: Retransmission
>
>
> How much traffic do you have flowing over that 512 Frame-relay? Also,
> are the clients on the wireless portion Citrix only or do you
> have some
> "fat" clients as well? If so, are the "fat" clients expiriencing any
> problems?
>
> Respectfully,
>
>
> Lucas W. Boyken
> Computer Systems Associates
> Account Manager / Technical Representative
> lboyken@xxxxxxxxx
> Company Phone: 800.222.7601
> Office Phone: 515.332.2751
> Fax: 515.332.5687
>
>
> -----Original Message-----
> From: Schneider, Chad M. [mailto:CMSchneider@xxxxxxxxx]
> Sent: Thursday, July 03, 2003 10:53 AM
> To: 'thin@xxxxxxxxxxxxx'
> Subject: [THIN] Re: Retransmission
>
>
> Some of the remote clients are wireless within their respective plant.
>
> The link from the farm to the remote plant is 512K frame?
>
> -----Original Message-----
> From: Lucas Boyken [mailto:lboyken@xxxxxxxxx]
> Sent: Thursday, July 03, 2003 10:45 AM
> To: thin@xxxxxxxxxxxxx
> Subject: [THIN] Re: Retransmission
>
>
> What kind of remote links are we talking about here? I have seen on
> this list problems with Citrix and Wireless connections. Something
> about the latency of wireless messing with Citrix. The other thing I
> have learned from my esteamed collegues here is that Citrix
> is somewhat
> touche about connections. It doesn't like any latency,
> connections have
> to be clean and big <-- seen this from expirience too. So,
> what kind of
> links are you running to your remotes?
>
> Respectfully,
>
> Lucas W. Boyken
> Computer Systems Associates
> Account Manager / Technical Representative
> lboyken@xxxxxxxxx
> Company Phone: 800.222.7601
> Office Phone: 515.332.2751
> Fax: 515.332.5687
>
>
> -----Original Message-----
> From: Schneider, Chad M. [mailto:CMSchneider@xxxxxxxxx]
> Sent: Thursday, July 03, 2003 10:29 AM
> To: 'thin@xxxxxxxxxxxxx'
> Subject: [THIN] Retransmission
>
>
> I have added the TcpMaxDataRetransmissions=5 entry and rebooted.
>
> Same issue still seeing a great deal of retransmission. Remote
> connections seem to be about 1/2 of all packets sent from server to
> client, are retransmitted. This is frustrating.
>
> Does not seem to affect anything local to our corporate campus. Must
> something to do with link latency, but what, and how do I go about
> fixing it?
>
> Chad
>
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