speedtouch  

[speedtouch] Re: Speedtouch reliability and performance

jazbo
Sun, 28 Apr 2002 16:45:34 -0700

Edouard Gomez wrote:

>John Herr ([EMAIL PROTECTED]) wrote:
>  
>
>>vpi and vci are two options you set in ppp options. they vary from ISP to
>>ISP. by chance my vpi and vci settings are the same as the default.
>>Appartently yours are not. Contact your ISP or try the modem under Windoze
>>and see what they are there, then change them in your ppp options file.
>>
>>these are covered in the HOWTO, as well.
>>
>>all the best,
>>john
>>    
>>
>
>Don't care about the previous post, this is not useful for you.
>
>The Wrong vpi/vci log entry is due to the fact that the modem is
>still receiving data after the deconection. 
>
OK, I know that my vpi and vci settings are correct for my ISP.  Good to 
know I am not seeing things when I read my /etc/ppp/peers/adsl file and 
check it against online docs for use of adsl and linux with my ISP.

In the spirit of thoroughness and disclosure this is my /peers/adsl file.
I can't remember if this  was setup by Mandrake8.2 internet 
configuration wizard or , more likely copied from my earlier working 
installation of "speedtouch" on a different system.

debug
kdebug 1
noipdefault
defaultroute
pty "/usr/bin/pppoa3 -c -v 1 -vpi 8 -vci 35"   ##correct for bellsouth, 
my ISP
sync
user "my_username"
novjccomp
noaccomp
nopcomp
nomagic
noccp
asyncmap 0
usepeerdns
holdoff 1
persist
maxfail 10

Maybe there's something wrong in the compression options that could 
cause the link to seem up and synched but no data can travel usefully 
either way?

The outage I gave logs for above was a typical occurence. I was 
downloading a large file at 150KBs from an ftp server. The transfer 
suddenly stalls, all http and dns resolution fails and I have to restart 
pppd.

If I don't push the speedlimit on my connection it can stay up for a 
couple of days maybe 4 or so.  If I dl something large from a ftp server 
I can count on it going out. But I am not *totally* sure it's consistent 
about when it drops.

Yesterday I was able to download a 94MB .iso file from thinknic over 
*http* at 149 KBs , sometimes hitting 188KBs, without losing the link. 
WHich I have done repeatedly before. without interruptions. While 
writing this, I downloaded it with wget again. Average speed of 152KBs - 
95679514Bytes - in 19M52s. No problems.
 However,  just 6megabytes into a high speed transfer of mdk-8.2 .iso 
from ftp-linux.cc.gatech downed the link yesterday and it took even less 
time today to generate the outage that I logged in my earlier post. (I 
was downloading again by ftp the same file) Yesterday I was able to 
resume and only got a 20 mb chunk of the same mdk .iso file before it 
happened again, and so on. If I want the mdk .iso file over ftp I have 
to try again and again and reconnect frequently. And on the other hand 
it seems that I can download this 94 MB .iso from thinknic.com over http 
anytime I want as often as I want and there's no trouble from the 
speedtouch.

I wonder if iptables could possibly be involved. Maybe by recycling my 
apparently down pppd link  I am *really* resetting a fubared iptables 
module. Will test.

> So when you're
>initializing a new connection, it may be possible to receive
>wrong packets that get through the error checking in pppoa3.
>Btw these (few) packets are discarded by the TCP/IP layer of
>your OS.
>
>  
>
So this neither implicates a boneheaded misconfiguration on my part nor 
indicates any other foulup that could easily be corrected apparently.  

Thanks,
~/j.



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