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| 05.09.2008 at 08:00AM PDT, ID: 23389586 |
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Need input on network config for VoIP
I'm considering implementing a VoIP system (like PBXtra, Switchvox, 3cx, etc), but need to address an issue with my network (See the attach pic for the layout).
My VPN between my two sites traverses the public network. I cant do anything about that because my branch office is in a rural area with very limited isp options. Baseline performance between the two sites seems acceptable (Latency: ~35ms ping time between servers; Bandwidth: 500+kbps throughput while my other applications are active over the VPN), but whenever a machine within my network generates web traffic by browsing a site, or downloading a file, the latency between the two sites spikes up to 300-400ms, and stays there until the transfer is complete.
Now, I know that there is no QoS on the public network, and when my VoIP data packets get out there, the routers in between aren't going to treat them any differently then your data packets for this website, and its a first come, first served scenario. But considering that the problems I am experiencing seem to be occurring when traffic is generated from WITHIN my network, is it reasonable to expect that I could address the issue by implementing QoS?
My VPN between my two sites traverses the public network. I cant do anything about that because my branch office is in a rural area with very limited isp options. Baseline performance between the two sites seems acceptable (Latency: ~35ms ping time between servers; Bandwidth: 500+kbps throughput while my other applications are active over the VPN), but whenever a machine within my network generates web traffic by browsing a site, or downloading a file, the latency between the two sites spikes up to 300-400ms, and stays there until the transfer is complete.
Now, I know that there is no QoS on the public network, and when my VoIP data packets get out there, the routers in between aren't going to treat them any differently then your data packets for this website, and its a first come, first served scenario. But considering that the problems I am experiencing seem to be occurring when traffic is generated from WITHIN my network, is it reasonable to expect that I could address the issue by implementing QoS?
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Zone:
Networking
Question Asked By:
brainbolt
Solution Provided By:
FaithShield
Participating Experts:
2
Solution Grade:
A
Views:
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| 05.09.2008 at 08:35PM PDT, ID: 21537762 |
Well first off, the 501, can't do QOS, so you would at least be looking at upgrading to an ASA.
Secondly no matter how you setup your QOS on your equipment you can't control the traffic inbound on your firewall from the internet, and that is where your bottleneck is. The traffic from the internet is coming in faster than your pipe can handle and it is buffering the packets, and thus causing latency.
In a voice scenario buffered packets = angry end users.
I have seen a customer put a seperate DSL line in and a seperate firewall / vpn connection and even a seperate switch, so that all the voice traffic was completely isolated from the data traffic.
This helped, but they still had QOS issues.
If you are willing to get another DSL connection, an ASA5505 instead of a 501, and a seperate switch, to run your phones off of, then you can try it. I personally wouldn't want to run voice over the internet, especially when I know it is going to cross from one ISP to another.
Secondly no matter how you setup your QOS on your equipment you can't control the traffic inbound on your firewall from the internet, and that is where your bottleneck is. The traffic from the internet is coming in faster than your pipe can handle and it is buffering the packets, and thus causing latency.
In a voice scenario buffered packets = angry end users.
I have seen a customer put a seperate DSL line in and a seperate firewall / vpn connection and even a seperate switch, so that all the voice traffic was completely isolated from the data traffic.
This helped, but they still had QOS issues.
If you are willing to get another DSL connection, an ASA5505 instead of a 501, and a seperate switch, to run your phones off of, then you can try it. I personally wouldn't want to run voice over the internet, especially when I know it is going to cross from one ISP to another.
| 05.12.2008 at 08:37AM PDT, ID: 21547918 |
Yeah, I'm aware of the 501 limitation. Upgrading is not out of the question if it is warranted.
I see the issue with inbound traffic that you mention. Is there a way around it? Could inbound traffic be classified by the firewall/router based on the port, or originating address, or some other critera?
I see the issue with inbound traffic that you mention. Is there a way around it? Could inbound traffic be classified by the firewall/router based on the port, or originating address, or some other critera?
| 05.12.2008 at 09:20AM PDT, ID: 21548268 |
No there is no way around the QOS issue. Your ISP will ignore or strip off any markings you put on your packets. Applying a QOS policy to data after it has already been through the bottle neck is like trying to widen a road to 4 lanes after it passes over a 2 lane bridge. The traffic will have already gone through the tough part, and anything you do to it after that will not affect the quality.
You can work around this issue on a private network because you can control what goes across the wan, but on the internet, when you request something the remote server is the one that controls when to send the response.
The only work around I can think of is if you turned off all your computers and other internet traffic generators each time you made a call. In this way you would somewhat control the inbound traffic by removing the requests that go out.
You can work around this issue on a private network because you can control what goes across the wan, but on the internet, when you request something the remote server is the one that controls when to send the response.
The only work around I can think of is if you turned off all your computers and other internet traffic generators each time you made a call. In this way you would somewhat control the inbound traffic by removing the requests that go out.
Accepted Solution
| 05.13.2008 at 02:38PM PDT, ID: 21559526 |
Before you invest in new equipment I would make sure your ISP can provide a proper level of service for voice. What type of data service do you have?
20080236-EE-VQP-29 / EE_QW_2_20070628
