Gizmo - QoS - Linksys

Posted by JohnP 08/24/2007 at 17:21

Completely unrelated … VoIP QoS trials in da House!

Fact 1, SunRocket Gizmos slow down internet activity when installed as SR requests. By half.

Fact 2, Having more than 1 device on a LAN with the same MAC address is a really bad idea – google "ARP" for details.

Fact 3, Placing the gizmo behind your router is more secure, but there are trade offs in complexity and/or voice quality.

Fact 4, I’ve been working with Cisco/Linksys tech support for 6 weeks to solve this issue.

Fact 5, My setup:

  • Comcast 6000down/384up Kbits/sec
  • Toshiba DOCSIS 1.1 modem – replaced for a 2.0 modem recently
  • WRT54GX-v2 router / 2.00.16
  • Gizmo on the "inside"
  • Multiple PCs and other media devices

Linksys has given me some ports to be forwarded to the gizmo – they seem like a major guess.
We have double checked my QoS settings; basically, Gizmo is HIGH and all other devices (by MAC) are LOW. Also, I’m on a beta version of the next firmware; so far so good.
Linksys Support: "kindly try to forward port 10,000-20,000, 5060-5061, 53 and 69 using UDP protocol" to the gizmo. I have no proof this will work, but wanted to share. Seems like shots in the dark to me. None of those ports interfere with others I need, so I’m willing to try.

Ok, I logged into the Gizmo on 7/27/06 to make these settings: according to it, the following ports are reserved: 68, 16384-16403, 5060. Better than what Linksys support is suggesting.

I may disable the SPI, once I figure out exactly what is really does. Facts, not hearsay.

If someone finds this interesting, throw me an email in a week or so with the URL back here. Once I have a known good config, I will create a clear picture of the network and settings, if there is interest.