Solved Intermittent Slow Internet Speeds

December 6, 2013 at 11:12:40
Specs: Windows 7
My network has a 50 x 5 cable connection that goes into a Cisco ASA5505. From the ASA, it connects to an HP 2530 ProCurve POE Gigabit Switch then to the individual work areas. Most work areas have a Mitel 5340 IP Phone and then a computer connected from the phone. The Cisco ASA5505 provides 2 VLans, one for voice and one for data. At random times during the day, the internet speed (tested using speakeasy.net) slows to almost a standstill at my desk. Last test was 3.10 x 1.90. I have a laptop plugged in directly to the back of the ASA and that test shows 47.07 x 5.16. I have also run the tests from the cable modem directly and those speeds are fine. I'm not sure where to start troubleshooting as this is a new cable connection, new routers, new switches and a new phone system. Could anyone point me in right direction? Please let me know if I can provide any more information.

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✔ Best Answer
December 10, 2013 at 07:17:04
Good so we've narrowed it down to the web filter.

So what happened when you bypassed the web filter? Did the bandwidth stay stable at what it should be, or did you experience slow downs again? If the device is rated for only 10 Mbps maximum then it's definitely choking your LAN access to the internet and you're paying for external bandwidth you can't access which as you probably know, is a waste of good money.

I would highly recommend you replace that unit with something a little newer that has a high enough bandwidth capacity to support what you presently have completely. If possible, I would suggest buying one that has higher bandwidth capacity in case you find yourself expanding in the future.

Just out of curiosity, how many users are you supporting? How many VoIP phones?

It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.

***William Henley***



#1
December 6, 2013 at 14:21:39
I'm guessing your setup is as follows:

Internet >> Modem >> ASA >> Switch >> Clients

Please confirm that, or explain if it's setup different.

Your tests seem to have ruled out everything on the external of the ASA unit, I would suspect the issue is with it. I've never used one of those appliances and couldn't begin to help you troubleshoot it but would suggest you contact Cisco if you have a support contract with them. Or the provider you bought it from if you have a contract with them.

If you don't have a support contract with anybody, and nobody here can help you, I would suggest finding yourself a cisco forum or two and asking there.

It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.

***William Henley***


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#2
December 9, 2013 at 05:11:38
Curt - Yes, that is my network setup. There is a Barracuda Web Filter before the ASA but I believe I have ruled that out as speeds to the ASA are acceptable. I plan on opening a case with Cisco today, I was just hoping maybe someone else has dealt with this issue before and might have some other suggestions. I do have a support contract. Thank you for your insight.

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#3
December 9, 2013 at 06:17:34
Curt - I apologize, the Barracuda Web Filter is after the ASA but before the switch. It is a WebFilter 210. I am going to do some research to see if there are any limitations with this model. I have had it since 2010 but I only had a 20 x 2 cable service and no VOIP phone system before.

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Related Solutions

#4
December 9, 2013 at 09:30:50
If you can, plug directly into the ASA (from the internal/client side) and see what results you get when you speed test. This will either rule the ASA out, or potentially prove that it is the issue.

I have no experience with that type of web filter either........sorry.....but unless it has bandwidth limitations, it shouldn't be an issue. The type of data travelling through it shouldn't matter (ie: VoIP or regular network traffic). But again, my lack of familiarity means I can't be 100% sure.

It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.

***William Henley***


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#5
December 9, 2013 at 09:58:42
Hi Curt - I have been testing speeds plugged directly into the ASA and those have been OK. I believe that the problem is with the Web Filter as throughput speed for my model is listed as 5 - 10mb, which would have been fine before we added VOIP, but now I don't think it is. I have bypassed the web filter for the moment and am hoping that my employees don't take advantage of "Free Internet Monday". It has been about 1 1/2 hrs since I bypassed it and have seen no slow downs but they generally happen in the afternoon. I will update you tomorrow and let you know.

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#6
December 10, 2013 at 07:17:04
✔ Best Answer
Good so we've narrowed it down to the web filter.

So what happened when you bypassed the web filter? Did the bandwidth stay stable at what it should be, or did you experience slow downs again? If the device is rated for only 10 Mbps maximum then it's definitely choking your LAN access to the internet and you're paying for external bandwidth you can't access which as you probably know, is a waste of good money.

I would highly recommend you replace that unit with something a little newer that has a high enough bandwidth capacity to support what you presently have completely. If possible, I would suggest buying one that has higher bandwidth capacity in case you find yourself expanding in the future.

Just out of curiosity, how many users are you supporting? How many VoIP phones?

It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.

***William Henley***


Report •

#7
December 10, 2013 at 07:43:57
The bandwidth has been stable and I confirmed with Barracuda that the appliance was too small for my needs. So now I am running unfiltered. I can purchase an upgraded model that will handle my traffic (50 users, 50 VOIP phones) or I can find another web filter solution. Any suggestions??? I really liked the Barracuda because it integrated with Active Directory and it allowed me to "schedule" times that users could be on Facebook, Sports sites, etc. I would like something that would offer the same type of flexibility.

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