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Slow upload on 25/25 fiber

Posted on 2013-05-13
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Last Modified: 2013-05-21
Our company had 3 T1s and we were getting about 2.5 upload and download. We have now switched over to a fiber line that is rated at 25 up and down. We are getting about 22 down so that is good. However we are barely getting 1Mbps UP which is very odd. Can you help me out with some suggestions on what might be causing this, in your experience?

Let me just add that when we connect directly to the fiber the upload is correct, so it's something in our equipment. The speed is tested with speedtest.net

Thanks!
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Question by:cpeele
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by:asavener
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Are you using ASA with the IPS module?

According to this thread (https://supportforums.cisco.com/thread/2081067) there is a bug (CSCsv69844).

Workaround is to set the Regex Depth Setting to 800000.

Instructions here:  http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&bugId=CSCsv69844
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by:cpeele
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We are using a PIX 515E. Maybe there is a similar issue? I will do a google search
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by:asavener
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The bug I reference only affects environments that have the IPS module, but I  expect that it affects PIX units with the IPS module, as well.

You can try disabling the IPS module (or not sending traffic to the IPS module) in order to test if it is the component causing the slow traffic.
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by:cpeele
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We are not using IPS. I also checked duplex settings as some articles mentioned that and they are 100full. Any other suggestions?
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by:asavener
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You stated that a directly-connected device sees full performance.  My next suggestion would be to add back components one-by-one, working your way in from the Internet connection, to identify where the bottleneck is.
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by:avcontrol
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Quick and dirty way is using kperf.......very simple.
http://wirelesslanprofessionals.com/resources/downloads/kperf_setup/  click "Kperf Setup".

Once installed, one PC run as "server" other as a "client".
Then measure speed across different network segments- for example, across single switch-> across 2 switches->accross PIX lan ports+switch.
Other, more precise and correct , use SNMP monitoring- like "engineering toolset" from www.solarwinds.com, you can get evaluation version.
That would show a lot of statistics for ports, CPU, memory, over time will graph it.
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by:cpeele
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OK! Here is what we've found: We have a Cisco 3550 switch (our equipment) where fa0/15 goes to an Adtran NetVanta 4430 (ISP equipment). Fa0/15 on the Cisco switch has dropped down to half-duplex. This has got to be the problem. Or at least a problem. Now the question is why? The Cisco port is set to Auto Duplex, and when I force it to Full, it shuts the port. I assume the NetVanta is set to Auto, but even if it was forced to Full, it should work when I change the Cisco side, right?
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by:avcontrol
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In this case , better have them both in Full, as long they matching speed, and set speed manually as well.
Otherwise lowest speed between two should be set.
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by:cpeele
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Right, but I have tried the Cisco on Full and Auto, and either way, the port shuts down/disables. I don't understand that because the NetVanta has got to be either Full or Auto right? I don' think they'd set it to half. In any case, we do not have access to the NetVanta so I can't check it. I would have to get the ISP to do that. I will call them if I need to but it's new equipment just put in, I just wanted to see if there was anything I could do on my end first.
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by:asavener
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First thing is to try replacing the cable.

Second thing to try is a different port on the switch.

Third thing is to confirm the port setting with the ISP.
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by:cpeele
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Tried a different switch port, so I will try the cable, then contact ISP. thank you
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by:asavener
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Thought of another test.

Connect another device directly to the NetVanta and see what the port settings are.

Then move that back to where the switch is, and connect to the cable to that goes to the NetVanta and see what port settings you get.
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Turns out the NetVanta port was forced to full, and I guess the Cisco did not play well so we set it to auto, that fixed the duplex mismatch! Now our upload went from under 1Mbps to about 2.5Mbps LOL. So there must be another mismatch or other problem somewhere. I will keep looking.
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by:cpeele
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Alright, we found the final issue! A port on our PIX which was connected to web filter appliance was also half duplex. Set that one to auto and now we have full up and down speed!
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by:cpeele
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Thanks for the tips guys! In the end, it was good old fashioned observation of switch lights and server monitor that told us about the duplex mismatch. Moral of the story - always go and physically check your server room for lights!
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