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How can I specify Bandwidth to Voice Data

Posted on 2009-05-11
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I have two remote offices connected through VPN using Pix 501 on both sides. we are also sending data as well as voice data for the phones through this VPN. At first office, where we have file server has 2 Mbps link, whereas other office has high speed DSL. Phones were working quite well, but since remote desktop users are increased in remote office and they continuously use the data from File server, our phone are not working well. Most of the times even we cannt call between the offices.
What can be the solution in this case? I was thinking If I manage the internet bandwith and specify around 60Kbps to only the Phones links, then I think I will work better.
Please help in this regard.

thanks.
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Question by:dasratleo
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by:arnold
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You have to setup a QoS policy to prioritize voice traffic over the VPN which is easier said than done. And not sure whether the IOS version you have supports it.

http://www.google.com/search?q=PIX+501+VPN+QoS
http://www.experts-exchange.com/Software/System_Utilities/Remote_Access/VPN/Q_23236644.html

qos pre-classify in the crypto map where you would have to define that voice packets are preferred.
http://security.ittoolbox.com/groups/technical-functional/cisco-security-l/qos-on-pix-501-797723

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by:dasratleo
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Thanks for quick response.
I have cisco pix 501 with 6.3 IOS version. I am not sure it supoorts version 7? Can I configure QoS in IOS version 6.3??
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by:arnold
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That is the difficulty.

The command refernece for 6.3 does not have a reference for qos.

An alternate approach could be to see whether it is possible to offload some/much of the data traffic by adding a mirrored file server at the remote location.
Or whether splitting the voice and data traffic into two separate VPNs is possible and helpful to improve the situation.
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by:dasratleo
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Can I create 2 vpns on Pix 501, one for data and one for voice?
If yes, then how can I allot the bandwidth to these two vpns because otherwise if they share the bandwidth, then we will definitely face the same problem.
If I go for Pix 515 or ASA, will I be able to solve this problem?

thanks.
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by:arnold
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I think the newer versions have QoS service especially designed to handle Voice type traffic through various means.
For pix 515 IOS version 7:
http://www.velocityreviews.com/forums/t297336-qos-on-pix-515-version-70.html

What is the source of data?  Do remote users have to terminal (RDP) into the main network?  It might be more cost as well as efficiency to setup a replicated (DFS) file server at the remote location. Since the file server will be local access to the files will be quicker. and only changed files will be transferred from the remote fileserver to the main location's file server.  With DFS replication you can decide how much bandwidth to use for data synchronization as well as a schedule for when such synchronization is to occur.
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by:dasratleo
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I think I need to go with new updated firewall, which supports bandwidth management. What do you suggest, which firewall should I go with to solve this issue?

thanks.
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arnold earned 250 total points
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You should research first which solution meets your current needs plus some additional performance handling.

Go with the platform you are more comfortable with. I think going with an ASA will likely get you up and running in shorter time than choosing an alternate product. Eventhough getting an older PIX running IOS 7.x which is what is discussed in the step by step guide included in the article below.
http://www.experts-exchange.com/Networking/Telecommunications/IP_Telephony/Asterisk_/Q_24132503.html
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