Rich Adamson wrote:
Thank you very much for your response. I do acknowledge that my previous
posts did not contain much technical information to speak of, but it was
mainly because I wasn't/am not familiar with the Asterisk CLI and
troubleshooting Asterisk problems, so I apologize for that.
I did get the idea early this morning to try to analyze packets with
ethereal, and I captured packets when I was made an internal IAX call to
the Asterisk system (voicemail). I don't really know what to look for,
but I will learn (again, I'm not very familiar with ethereal). Do you
hapeople say ve any suggestions for filters to use, to evaluate possible
packet loss or resending of data?
An important item to look at in each packet is the timestamp. In sip
packets, the timestamp should be increasing by 160 for each conseq pkt.
In iax packets, the timestamp should be increasing by 20 for each pkt.
So if you see a timestamp of 3290 in one pkt and 3310 in the next (a diff
of 20), that's good. Notice the increasing timestamp value and the diff.
If pkt 3310 arrives before 3290, then something in the network is delaying
the delivery of packets so as to cause them to not arrive in the proper
order.
If there are missing packets, then you'll see timestamps jumping by 40,
60, 80 or some other value (diff) for iax packets, or, similar for sip
packets.
Regarding the command that you suggested in the CLI, iax2 show netstats,
it doesn't recognize that command or anything similar, and 'help'
doesn't return anything similar that I can see (I'm using 1.0.7 if that
helps).
Since 1.0.7 is rather old (in the scheme of things), I'd suggest you
install something newer to play with. There has been a ton of stuff
that has changed since 1.0.7, but I don't recall if those changes would
have anything to do with your problem. (I use nothing but cvs head, but
I kind of keep an eye on how many changes are happening (and for what
reason), and upgrade when the number of problems seem to be at a low.
The 'iax2 show netstats' would have been added in a later version.
At this point, I'm thinking that it could be a matter of bad cabling or
something. The Cat5 cable that's running the 8 or so feet from my PC to
my router is homemade by me, and many people do report problems with
homemade cables. I may not have made it exactly right, or the untwisted
segment may be longer than 1/2", which supposedly causes distortion and
interference. Perhaps I ought to run out and buy a couple factory-made
cables to test the difference, if any, between them.
Replacing the cable would probably be a good start since they are
relatively cheap. Go buy a new one so there's no question about its
quality. Also, keep the cable at least a little distance away from
transformers, ballasts, and other things that tend to generate tons
of electical noise. (Some desk lamps even have extremely noisy transformers
or ballasts in them.)
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Your advice was *extremely* helpful. It seems that I learn something new
each time I read you all's posts. To me, it looked like each packet was
correctly sent at the right interval each time, but I didn't evaluate
each one. However, the general trend is that there seems to be no packet
loss or resending.
I could buy another cable as well, just to be safe, but it seems to me
the potential IRQ conflict is more the more likely problem--of course,
even when I "ifconfig eth2 down"ed the interface, it still showed up in
/proc/interrupts -- does bringing the interface down not completely
bring it down? Should I permanently disable it and reboot?
Again, thank you very much for your ongoing help; I feel like I'm paying
(or ought to) for professional support here. :-)
Regards,
Robert Geller
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