Thanks Scott ! We do not have any vpn tunnel on the segment where customers are complaining.
Anyway, i will try to adjust the MSS and MTU on all the router's interfaces. For the sniffer, do you have one that you suggest using for this troubleshoting issue ? Also want to know if i put the OT at the rigth place. Thanks Luc Valere BIKANDA ________________________________ From: Tyson Scott <[email protected]> To: VALERE BIKANDA <[email protected]>; "Bodnar, Edward" <[email protected]>; Marko Milivojevic <[email protected]> Cc: ccie_rs <[email protected]> Sent: Mon, May 10, 2010 7:36:46 PM Subject: RE: [OSL | CCIE_RS] Application Layer Troubleshooting Valere, Try decreasing the mtu on the a machine down to 1200 or 1000 for example to see if that is the source of the problem. Do you have VPN tunnels that the traffic is traversing thru? MPLS VPN's? If the above works then you may start decreasing the MTU on your edges to the provider and using the tcp adjust-mss back towards your domain to help control the windowing between the servers and clients. To troubleshoot this further if the MTU suggestion above fixes the problem but the MTU adjustments on the network do not solve the issue you will need to look at using a sniffer and begin looking at it throughout the domain to see where it is being dropped. For future non related study questions please put OT at the beginning of the subject line so others can selectively choose to ignore them. It is OK to ask questions once in a while but it should not be a continuous thing ;). We don't want this to be group study. Regards, Tyson Scott - CCIE #13513 R&S, Security, and SP Technical Instructor - IPexpert, Inc. Mailto: [email protected] Telephone: +1.810.326.1444, ext. 208 Live Assistance, Please visit: www.ipexpert.com/chat eFax: +1.810.454.0130 IPexpert is a premier provider of Self-Study Workbooks, Video on Demand, Audio Tools, Online Hardware Rental and Classroom Training for the Cisco CCIE (R&S, Voice, Security & Service Provider) certification(s) with training locations throughout the United States, Europe, South Asia and Australia. Be sure to visit our online communities at www.ipexpert.com/communities and our public website at www.ipexpert.com From:[email protected] [mailto:[email protected]] On Behalf Of VALERE BIKANDA Sent: Monday, May 10, 2010 1:24 PM To: Bodnar, Edward; Marko Milivojevic Cc: ccie_rs Subject: Re: [OSL | CCIE_RS] Application Layer Troubleshooting Am also working to pass my ccie lab exam but at the same time, want to discuss with other peoples, issues i have in my everyday job related to my ccie lab preparation. Luc Valere BIKANDA ________________________________ From:"Bodnar, Edward" <[email protected]> To: VALERE BIKANDA <[email protected]>; Marko Milivojevic <[email protected]> Cc: ccie_rs <[email protected]> Sent: Mon, May 10, 2010 7:09:33 PM Subject: RE: [OSL | CCIE_RS] Application Layer Troubleshooting I am not sure if this is the right place for asking Work related questions. This is more of an e-mail group of people trying to work on getting there CCIE. From:[email protected] [mailto:[email protected]] On Behalf Of VALERE BIKANDA Sent: Monday, May 10, 2010 1:05 PM To: Marko Milivojevic Cc: ccie_rs Subject: Re: [OSL | CCIE_RS] Application Layer Troubleshooting Hello Marko ! Sorry for not giving the feedback for the issue we had a couple of weeks ago. The problem was BGP conflict. Our isp was announcing the IP range with his AS number and another ISP in US was still advertising the same IP range with another AS number to the Internet. So, when troubleshooting through reverse traceroutes, the traffic was sent to US when the AS path was short and to our country when our AS path was shorter than he one originated from the US. We finally arranged that with the provider in US and everything was fine. But actually, we sometimes have access to some web sites but can't open or download something at sometimes and everything get's back to normal without any configuration change. I can't understand what is going wrong. Thanks Luc Valere BIKANDA ________________________________ From:Marko Milivojevic <[email protected]> To: VALERE BIKANDA <[email protected]> Cc: ccie_rs <[email protected]> Sent: Mon, May 10, 2010 6:38:05 PM Subject: Re: [OSL | CCIE_RS] Application Layer Troubleshooting I'm sorry to be rude, but didn't we go through all this with you couple of months ago? -- Marko Milivojevic - CCIE #18427 Senior Technical Instructor - IPexpert YES! We include 400 hours of REAL rack time with our Blended Learning Solution! Mailto: [email protected] Telephone: +1.810.326.1444 Fax: +1.810.454.0130 Web: http://www.ipexpert.com/ On Mon, May 10, 2010 at 18:30, VALERE BIKANDA <[email protected]> wrote: Should i change the mtu on all the routers and all the interfaces ? Hello all ! Am Working with an ISP and noticed that some customer can not download their mails some times and download informations from certains web sites. When thathappens, pings are OK. We can still access the web sites but cannot download something. I don't know how to troubleshoot some applications and find out what isgoing wrong. Thanks ! Luc Valere BIKANDA Luc Valere BIKANDA Cameroon Telecommunications IP Network Sub Director Phone : (O) 237 22 22 17 33 (M) 237 22 00 39 35 ________________________________ From:VALERE BIKANDA <[email protected]> To: ccie_rs <[email protected]>; ccie_sp <[email protected]> Sent: Mon, May 10, 2010 3:12:28 PM Subject: Re: [OSL | CCIE_RS] [OSL | CCIE_SP] hello Hello all ! Am Working with an ISP and noticed that some customer can not download their mails some times and download informations from ctains web sites. When thathappens, pings are OK. We can still access the web sites but cannot download something. I don't know how to troubleshoot some applications and find out what isgoing wrong. Thanks ! Luc Valere BIKANDA Error! Filename not specified. _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
_______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
