QoS is not configured ?

[dkounal]

I live in Greece and these days I am checking all Internet Providers for finding the most suitable for Broadvoice.
I have a linux router and an Asterisk that connects to Broadvoice and I was trying to use a QoS script that gives priority to packets that have marked their TOS with 0x10 value (lowdelay).
It can be done with sip.conf using directive TOS, but same configuration option exists for most VoIP devices.
I noticed that the script I was using was working OK for the VoIP service of my Internet provider but not for broadvoice. With broadvoice, after 2-3 sec I had a 3000ms ping and about 2 sec latency. I was using a p2p program for creating traffic.
I run the ethereal, a graphic tool that works as a sniffer and I notice the following:
All RTP packets leaving my asterisk box for broadvoice had the flag TOS set to 0x10. The same when using my Internet provider's voip service.
The difference was in the packets coming to my asterisk box.
Broadvoice's RTP packets had flag TOS set to 0x00 but my Internet provider's RTP traffic had TOS set to 0x10.
I tried the same thing with two other providers but for all packets from broadvoice had TOS set to 0x00.

This can be a misconfigure from broadvoice or the RTP packets lost their TOS flag on the way to my asterisk box.
The question now: Is it possible for someone to ckeck if RTP packets that he/she receices from broadvoice have TOS flag set or not ?
Thank you in advance,
Dimitris

[dkounal]

Quite difficult question I had finally....

[mberlant]

It's an excellent question. I wish I had a direct answer. Have you tried looking at the wiki at www.asterisk.org for guidance?

[dkounal]

Originally Posted by mberlant

It's an excellent question. I wish I had a direct answer. Have you tried looking at the wiki at www.asterisk.org for guidance?

It has nothing to do with asterisk. And I did not find anything about that concerning broadvoice in voip-info.org
It has to do with Broadvoice and with main routers in the Internet that could probably change it.

edit: I have used the free program ethereal that exists for win, linux, mac. The TOS field can be found in the "Internet protocol" of eath packet captured and it is named "Differentiated service Field".

[mavoip]

Originally Posted by dkounal

All RTP packets leaving my asterisk box for broadvoice had the flag TOS set to 0x10. The same when using my Internet provider's voip service.
The difference was in the packets coming to my asterisk box.
Broadvoice's RTP packets had flag TOS set to 0x00 but my Internet provider's RTP traffic had TOS set to 0x10.
I tried the same thing with two other providers but for all packets from broadvoice had TOS set to 0x00.

Well it leaves your Asterisk box fine but it never gets to anyone with the tos either way!!
All respective ISP's have there clients on untrusted ports (except if you pay them to trust you)

The QoS and tos is only for your own network or the network(s) that you control. This is by choice of-course but think what will happen if I was a spammer and I marked all my emails with a tos 0x10 or my uploads or when I play an online game I setup my firewall/router to mark the packets with a tos 0x10. Simple I'll eat up all the bandwidth of the ISP and you will not even able to place a call. :cry:

So it is not BroadVoice miss-configuration and not yours. You can have your Asterisk to contact a friend of yours that runs ethereal and see your packets getting to him. They will not have the tos. If they do have it then it is just ignored on the ISP and everyone in the middle.

Most ISP's to cut costs use strange routing. You can simple do a trace route and see after how many hops you get to the BroadVoice, or to see which router has the problem and delays your traffic. If you get to BroadVoice with more than 17 hops then change ISP.

Ποιό ISP έχεις;
[/b]

[dkounal]

Originally Posted by mavoip

So it is not BroadVoice miss-configuration and not yours. You can have your Asterisk to contact a friend of yours that runs ethereal and see your packets getting to him. They will not have the tos. If they do have it then it is just ignored on the ISP and everyone in the middle.

Most ISP's to cut costs use strange routing. You can simple do a trace route and see after how many hops you get to the BroadVoice, or to see which router has the problem and delays your traffic. If you get to BroadVoice with more than 17 hops then change ISP.

Ποιό ISP έχεις;
[/b]

I was afraid of such a situation. So, at least I can use 0x10 to send my packets to broadvoice for a faster throughput inside my ISP.

I have HOL as ISP (13hops, 180ms to proxy.chi.broadvoice.com under heavy load) and I have also tested ACN, forthnet, otenet, vivodi. The first was the better (and HOL follows with 10ms more), the last was out of the game and forthnet-otenet were just some ms more than HOL. All except vivodi have no packet loss and no difference in sound during the call.

I am looking now for a good QoS script for linux since I am not happy with the existing I have, more for the upload way.