Thanks for the feedback! I was leaning towards pfSense, so this makes me feel a bit better about that. Tony, I saw your blog posts and they seem very helpful (I'm subscribed to your blog).
I've been running a number of tests with QoS and remote workers with the D-Link DIR-655 and the PAP2T-NA adapter. QoS definitely helps, but it's not perfect. Here's what I found: - Automatic Classification on the DIR-655 must be enabled. I could not get acceptable quality with this setting disabled when the upload speed was saturated, regardless of the priority I set the traffic for the PAP2T-NA device to be. - Using Automatic Classification will cause VoIP traffic to have a very low priority number (which gives it a higher priority). Without any manual QoS rules, the lowest priority it will use is 128. VoIP traffic would usual get a priority somewhere between 129 and 139 (I don't remember the exact numbers). - Adding a manual rule while still using Automatic Classification seemed to help slightly. I ended up creating a manual rule for all traffic on the PAP2T-NA to have 64 as the priority. I confirmed that the traffic from this device had this priority, and there seemed to be a slight improvement in quality. - Saturating the upload speed had a bigger impact on the voice quality than saturating the download speed. Downloading at full speed, the call quality on the other end was perfect, but on my side there was a slightly noticeable degradation in quality (someone not listening for it might not notice). However, when uploading at full speed, the call quality on the other end was noticeably worse. The other side could still understand everything I was saying, but it was not acceptable for regular business use. On my end, the quality was fine. I could not tweak the settings on the DIR-655 to improve this any further. The only thing I can think of that I didn't try was manually setting the uplink speed rather than using the automatic setting and lowering the value. The measured uplink speed when set to automatic was around 1055 kbps. Maybe lowering this to 1025 or 1000 kbps may help? I may try this later. What should I expect from this type of router? I know that it's not a high end router, so maybe this is as good as it gets? Does anyone have any suggestions on how to improve this?
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