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netentity
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PostPosted: Tue May 15, 2007 10:50 am    Post subject: Motorola VT2142: bridging (yellow) e-net/(blue) i-net ports Reply with quote Back to top

I have my own advanced home network with business grade Cox high speed Internet set up with my own FreeBSD based mail server, FreeBSD based firewall running pf/ALTQ, Cisco switches, a Cisco WAP and VLANs.

I want to configure the Motorola VT2142 to bridge the ethernet traffic from my Cox cable modem that is not Voip traffic. I would like the Motorola gateway to be between my cable modem and external/ISP VLAN network so it can force QoS on all egress traffic obviously giving Vonage Voip traffic priority. All ingress traffic that's not Voip traffic gets forwarded back out through the ethernet (yellow) port with no changes done whatsoever to the ethernet frames or IP packets.

The DMZ functionality isn't what I want. DMZ on your typical gateways takes all ingress traffic at L3, NATs it and forwards it to a specific single static IP in your internal network; typically an RFC1918 address. Not ideal in a business grade environment where one may use several static IPs from my ISP and redundant firewalls.

Presently I have the Internet (blue) port on the same VLAN as my cable modem and external NICs of my firewalls and servers. I have the ethernet (yellow) port on VLAN in my internal network with NAT, firewalling and DHCP disabled.

If I can't enable the desired bridging on the VT2142, this is as probably as good as it gets and will have to implement traffic shaping on my server(s) and firewall(s) using pf/ALTQ to always leave bandwidth available for Voip in additional to the QoS mechanism of my cablemodem running DOCSIS 2.0.

Any recommendations on a Voip gateway that functions with Vonage that provide the desired functionality if I can't get the VT2142 to do it? D-Link, Linksys or SMC are not options. Even though Linksys is owned by Cisco now, I have some reservations about using Linksys products in a small business environment. Motorola is preferred as I've had no issues with my SB4220 cable modem. I will obviously entertain using Cisco equipment.
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xcrunxc
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PostPosted: Wed May 16, 2007 12:13 am    Post subject: Reply with quote Back to top

What you are looking for is not possible on any Vonage device. The question is why are you even thinking of using the Vonage VT2142 adapter as a functional part of your network. Is is the most basic of routers, and it doesn't even do a good job at that. Just stick in a switch behind your border firewall and forget that it has any routing capabilities at all(not too far from the truth).

I am not sure how much bandwidth Cox is giving you but Vonage can be tweaked down to use about 30kbps, so assuming that the Business package is giving you at least 1mbps, that leaves you with almost 1000kbps to play with for your server and network setup. Unless your home network is pushing this amount of traffic consistently which would be hard for a mail server and any number of computers in normal usage(even if there are more servers you did not list), then you shouldn't really need any significant QOS solution. For example, I have my network set up CM > Router > VT2442 and I have a web server, a torrentflux box, WAP and about 8 computers in all stemming off the Router through various switches or through the WAP connected to it and I am hard pressed to be generating enough traffic to get any degradation of a Vonage phone call and unless I was actually trying to make the audio break up due to link saturation I probably would not be able to.

Now you say your border router is running pf/ALTQ, well one of the primary purposes of ALTQ is QOS, if you must just set up filtering rules for Voip and you can be assured it has priority over your other network traffic.

Finally, just to restate, do not expect the Vonage device to be a router even if it is billed as one. I am sure any person on this forum would attest the the fact that the Motorola devices, and in-fact all of the Vonage devices are mean for very small home network setups and when you start asking them to handle significant traffic they, simply put, will not.
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netentity
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PostPosted: Wed May 16, 2007 9:46 am    Post subject: Vonage in a small business network... Reply with quote Back to top

xcrunxc wrote:
What you are looking for is not possible on any Vonage device. The question is why are you even thinking of using the Vonage VT2142 adapter as a functional part of your network. Is is the most basic of routers, and it doesn't even do a good job at that. Just stick in a switch behind your border firewall and forget that it has any routing capabilities at all(not too far from the truth).

Simple, I don't want my Voip service to go down should my firewall fail or I'm doing an upgrade to it. Even if you use a redundant firewall/gateway solution with CARP/HSRP/VRRP you will still lose Voip service momentarily during the failover process while packets are going through a different path. You will also lose it again when the master comes back up while packets are going through the master's path. Also, if you use a PC based firewall using an open source OS you are likely to experience either a power supply or hard drive failure. I have experienced both. The only way to get around this is to have the Internet port of the Vonage device on the same L2 network as the cable modem and obtain an IP address from your ISP. You then only have two points of failure notwithstanding power; the Vonage Voip gateway and your ISP.
xcrunxc wrote:
I am not sure how much bandwidth Cox is giving you but Vonage can be tweaked down to use about 30kbps, so assuming that the Business package is giving you at least 1mbps, that leaves you with almost 1000kbps to play with for your server and network setup. Unless your home network is pushing this amount of traffic consistently which would be hard for a mail server and any number of computers in normal usage(even if there are more servers you did not list), then you shouldn't really need any significant QOS solution.

I don't know about that. I was at my regular employer's until 3am dealing with an Nachi infestation a few years ago that brought our Cisco 7513s down to their knees. (Yes, I am a network engineer by trade; have been since 1989). If there was a QoS solution in place at the time it probably wouldn't have bit us so hard. Then again my regular employer is a government agency where management and administration checks their common sense at the door.

Cox has been smurf attacked as well. The broadcast traffic filled my ipfw log. My objective of utilizing such a QoS mechanism in place is for security and future expansion concerns where I may be implementing GRE tunneling to remote locations. They finally disabled IP directed broadcast traffic after I told them several times to do that.
xcrunxc wrote:
Now you say your border router is running pf/ALTQ, well one of the primary purposes of ALTQ is QOS, if you must just set up filtering rules for Voip and you can be assured it has priority over your other network traffic.

I am well aware of that. Why do you think I run pf/ALTQ on my FreeBSD firewall instead of ipfw which is the default firewall solution for that OS? Switching from ipfw to pf/ALTQ is not a small casual undertaking of just flipping a switch during sysinstall.
xcrunxc wrote:
Finally, just to restate, do not expect the Vonage device to be a router even if it is billed as one. I am sure any person on this forum would attest the the fact that the Motorola devices, and in-fact all of the Vonage devices are mean for very small home network setups and when you start asking them to handle significant traffic they, simply put, will not.

Define significant traffic. A T-1 is use to be a big deal, now any broadband provider can provide that without much effort. The objective of my posting is to do my due diligence on what I can and cannot do with a Vonage supported Voip gateway in my home office network to implement the most effective solution for me. I always ask this question when implementing something or working on a project, "What's the worst than can happen and what can I do to fix it now?" The goal of this thread is so I have the information so I can fix it now.
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