Poor quality going out, great performance coming back

Posts: 2 · New Forum Member Joined: Jan 26, 2006 Posts: 2

Does anyone have ideas about why I have such a big desparity between sending information out versus information coming back in? I tried the Voip tests, and going out to Boston I see packet discards of 73.8% and yet on the return trip its down to 7%. Any thoughts?

MOS Analysis From You TO Boston

Media Quality MOS 2.8 / 5.0
(Best with G.711 is 4.4)

Degradation Sources
Codec 0.57 26.2%
Latency 0.00 0.0%
Packet Discards 1.62 73.8%
Packet Loss 0.00 0.0%

Codec G.711 (PCM at 64kbps,
20ms RTP payload,
80kbps IP BW)
Round-Trip
Latency 190 ms
Packet Discards 5.3%
Packet Loss 0.0%
Loss Periods Min: 20 ms
Avg: 20 ms
Max: 60 ms
Random Loss

Jitter Min: 0 ms
Avg: 9 ms
Max: 67 ms

Signaling Quality Post-Dial Delay 110 ms
Call Setup Time 120 ms
Media Delay 260 ms
MOS Analysis FROM Boston To You

Media Quality MOS 4.4 / 5.0
(Best with G.711 is 4.4)

Degradation Sources
Codec 0.58 93.0%
Latency 0.00 0.0%
Packet Discards 0.04 7.0%
Packet Loss 0.00 0.0%

Codec G.711 (PCM at 64kbps,
20ms RTP payload,
80kbps IP BW)
Round-Trip
Latency 190 ms
Packet Discards 0.3%
Packet Loss 0.0%
Loss Periods Min: 20 ms
Avg: 20 ms
Max: 20 ms
Random Loss

Jitter Min: 0 ms
Avg: 0 ms
Max: 20 ms

Signaling Quality Post-Pickup Delay 118 ms
Call Setup Time 127 ms
Media Delay 150 ms

Posts: 2257 · Posted: Thu Jan 26, 2006 9:06 am Post subject:

Run a speed test ( either www.dslreports.com/stest or the one here).

Do you run anything that does large uploads? BitTorrent? FTP uploads? A web server?

Posts: 2 · New Forum Member Joined: Jan 26, 2006 Posts: 2

I ran a speed test on upload/download with results of about (387kbp/2.4mbp). I've tried removing the router and going directly from my system to the cable modem. I'm pretty sure the problem is with the ISP, but not sure how to describe it properly.

I've noticed that tracert is giving me very strange results, I'm not getting any hops just

1 * * * * request timed out
2 * * * * request timed out
3 * * * * request timed out
4 * * * * request timed out
.
.
.

Posts: 2257 · Posted: Thu Jan 26, 2006 10:41 am Post subject:

If you're getting lag when doing the Voip test on a computer connected directly to your cable modem, then the problem lies with your ISP, most likely.

Looks like you've done most of it, but here's some tests you can run...

http://vonage.nmhoy.net/packetloss.html

But I think at the end of all that, you'll end up calling your ISP and have them do a line test.

Posts: 17 · Vonage Forum Associate Joined: Jun 02, 2003 Posts: 17

odorizzi wrote:

Does anyone have ideas about why I have such a big desparity between sending information out versus information coming back in? I tried the Voip tests, and going out to Boston I see packet discards of 73.8% and yet on the return trip its down to 7%. Any thoughts?

Yes.

Having been in the ISP/ASP/IPP business since the mid 1990s (over ten years now) I can tell you that routing in different directions usually takes completely different paths.

It's caled the Hot-Potato method of routing. Everyone wants to get the packets off their networks (where they pay for traffic) and on to someone else's network (where someone else pays for traffic) as soon as possible. So outgoing your ISP is trying to get the traffic off his network, to a different network as soon as he can, and incoming the sender is trying to get the packet on to your ISPs network (or someone else's path to your ISPs network) as soon as possible.

For a more complex explanation, you can look here:

http://citeseer.ist.psu.edu/632914.html

Jeff