On 5/23/06, ILAN <[EMAIL PROTECTED]> wrote:
Hi
I just found out this thread using Google.
I'm connected to 012 on Suse 10.1 using their login scripts.
I'm using Motorola SB4200 on USB .
I have a lot of packet losses (?) etc. My download tests vs HOT are OK but vs
012 are 50% !
Example from System Log :
anon log[decaps_gre:pptp_gre.c:407]: buffering packet 55280 (expecting 55279,
lost or reordered)
Did you discover the cause of the problem ?
012 Support claim its the problem of the Linux USB and tell me to use NIC
instead which doesn't fit my needs .
Thank you
Ilan
Hi Ilan!
I actually have no ADSL or Cable connection now (I connect through
Technion LAN). Some time ago I tried to get a PPTP connection work,
but as you could saw, sometimes one pptp packet is lost and this cause
lots of problems in Linux. The driver tries to buffer subsequental
packets and wait for the lost one until a timeout occurs. Probably
this timeout exeeds some TCP/IP one, so a TCP/IP level "thinks", that
lots of packets were lost and tries to retransmit them all. I suppose,
windows PPTP driver just passes all data to upper levels, so TCP/IP
level sees that only one packet was lost and only this packet is
retransmitted. So IMHO the problem of lost packets persists in Windows
too, but it's less notable. Also I don't think, that the USB modem is
what causes your problems. I've seen the same with ethernet-connected
modems.
So I can advise you to try the following:
1. Install the latest kernel (I heard, some changes were done recently
regarding PPTP)
2. Look for all kernel options in PPTP section. Probably you can
disable/minimise the time, which takes PPTP level to decide, that some
packets are lost (and not just reordered).
3. Try a different ISP. You can ask some ISP to give you 1 day trial
without any obligations (you don't have to unsubscribe from 012
service for that). If you find some ISP which isn't suffer from this
problem, just switch to it. If the problem persists with all ISPs you
should talk with HOT/Bezeq tech.support and insist on sending their
technician to your home to check the connection. Probably you'll have
to do it several times, before they actually fix something.
5. Change to PPPoE protocol. This may require to change the "modem" /
internet provider / connecting method (cable/adsl). AFAIK PPPoE causes
less problems with linux.
6. If you will be very strong, you can demand from your ISP "the
connection without a dialer", which means all you should do to
"coonect' to the internet (to get a real IP) is just to make DHCP
request. No annoying tunnels any more! Most ISP will claim at first,
that they don't offer such a service. Don't beleve, they do. This
require a little bit more work from their tech. stuff, but it isn't
hard to make this possible. Probably most salesmen don't know about
such option, so you can ask to talk with their headman. Some ISPs can
tell you, that such a service require additional pay, but some won't.
You can also say to 012, that you will discontinue to use their
service, if they don't give you such connection. So, after some
fighting you have a chance to get very suitable connection.
And some common tip: subscribe to linux-il mailing list (send the word
"subscribe" to [EMAIL PROTECTED]), so you can discuss
your problem with more, than one person. I'm CC'ing this email to
Linux-IL. There are people in this list, which probably have more
experience with ADSL/Cable connecting, than I have (and they probably
check their mailboxes more frequently, than me). Also, if you discover
some solution, others will be able to find it in maillist archives and
benefit from this too.
Currently I have to prepare for some exams, so I don't think I'll have
a time to check this mailbox (and make replies) in the near future :(
Good luck,
Ilia.
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