On Tue, Aug 07, 2007 at 03:59:29PM +0300, Geoff Shang wrote: > I've been using Barak Internet with Hot Cable for over 3 months. I have an > Edimax 4-port router (the wireless part is currently deactivated), with some > PCs and a Zyxel VOIP adaptor connected. > > Everything was working fine until a couple of weeks ago when I noticed that > VOIP traffic was suffering in the afternoons and evenings. This would range > from moderate levels of break-up to the inability to initiate a call or even > get a dial tone (i.e. SIP registrations were failing). The device is > registered with an Asterisk co-located server in the US, and you can plainly > see the registrations starting and ending in the Asterisk console.
The whole point of UDP, is that it's basicaly raw IP. IP was designed as a packet routing protocol, you stuff a packet in here and it comes out there. When, or if, it comes out, in what sequence it arrives and the condition it arrives in are anyone's guess. Since IP is a dynamic routing protocol, it's possible for packets to arrive out of sequence, incomplete, or just plain messed up. That's why TCP was developed, UDP had so many problems that it was considered unusable for sending any data that mattered. Some protocols written on top of UDP were designed to accept this and do their own error and sequence checks. Most VoIP protocols use it because of the lower overhead. Retransmission is not an option for VoIP especialy for international calls, by the time the packets would get retransmitted, it would be too late. It's just better to drop them and wait for new ones. > Here's my symptoms: > > * Up till about 10 am or 11 am, moderate to good VOIP/Skype performance. That's normal. > * From then on, poor performance to completely unusable. That's also normal, but usually it starts later in the day. > * TCP (both up and down) seems to be completely fine. I seem to be getting > the full 1500/512 kbps that I should be getting. And pings are also solid. >From where? I get my rated speed from my ISP to my router all the time too. It has little or no effect on what I get to anywhere else. > Yesterday I did some testing with a friend in the US who had some UDP tools > like traceproto and hping3. We managed to trace it to a Barak router a > couple of hops from me. Unfortunately, they seem to have changed their > routing tables today and the addresses are all different. Probably because they just merged with Netvision. I assume the first thing they are doing is to combine the networks. > So now I'm wondering if I'm crazy or if anyone else is having similar > issues. I figure that if I can find other users who are experiencing > similar issues, it'll be easier to persuade them that they need to take a > look at their own equipment. I suggest you wait a few days for the dust to settle. I just did an echo test using Free World Dialup and a Linksys PAP2. I have a 5m/256k HOT connection with Netvision. No problems or packets dropped. Geoff. -- Geoffrey S. Mendelson, Jerusalem, Israel [EMAIL PROTECTED] N3OWJ/4X1GM IL Voice: (07)-7424-1667 U.S. Voice: 1-215-821-1838 Visit my 'blog at http://geoffstechno.livejournal.com/ ================================================================= To unsubscribe, send mail to [EMAIL PROTECTED] with the word "unsubscribe" in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
