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Packet loss via router

Posted on 2002-05-28
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Last Modified: 2010-03-18
Hi,
I have a network of about 40 computers. They are connected to the Inet via router,which is a Linux (Mandrake 8.3/iptables 1.2.5)box, connected to ADSL line with Alcatel SpeedTouch Home ADSL modem. When i try to connect something from the network, I get about 70% packet loss. From the router the line works decently (~2% packet loss).
 Please, help!!!
            L.
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Question by:Leonid99
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20 Comments
 
LVL 51

Expert Comment

by:ahoffmann
ID: 7040004
either the driver, or the NIC, or the cable, or the hub/switch has a problem.
I'd start with exchanging the cable, then NIC ..
0
 
LVL 1

Author Comment

by:Leonid99
ID: 7040929
Checked it, no data loss between router and computers inside the network. It's some weird mtu problem
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LVL 51

Expert Comment

by:ahoffmann
ID: 7041232
did your router forget about window size settings?
Did you try to force set the mtu < 1500 on the NIC (not a good idea 'cause it affects LAN traffic too, but worth a try)
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LVL 3

Expert Comment

by:cincin77
ID: 7041451
Does the ping command also have packet loss?
As it uses 64 byte packets by default which has nothing to do with MTU? (also as it is an ICMP message nothing to do with MTU:)) )
0
 
LVL 1

Author Comment

by:Leonid99
ID: 7041530
I check the data loss with 'ping -s 1400 x.x.x.x'
from router it does 0% packet loss, from the internal host it does 70%
0
 
LVL 3

Expert Comment

by:cincin77
ID: 7041539
what about without the -s option?
0
 
LVL 1

Author Comment

by:Leonid99
ID: 7041638
I check the data loss with 'ping -s 1400 x.x.x.x'
from router it does 0% packet loss, from the internal host it does 70%
0
 
LVL 1

Author Comment

by:Leonid99
ID: 7041804
I check the data loss with 'ping -s 1400 x.x.x.x'
from router it does 0% packet loss, from the internal host it does 70%
0
 
LVL 1

Author Comment

by:Leonid99
ID: 7041819
I check the data loss with 'ping -s 1400 x.x.x.x'
from router it does 0% packet loss, from the internal host it does 70%
0
 
LVL 1

Author Comment

by:Leonid99
ID: 7043742
I check the data loss with 'ping -s 1400 x.x.x.x'
from router it does 0% packet loss, from the internal host it does 70%
0
 
LVL 1

Author Comment

by:Leonid99
ID: 7043768
That's what bad connection, and computer left on overnight do :)
0
 
LVL 16

Expert Comment

by:The--Captain
ID: 7043989
Have you tried playing with your MTU values?

Cheers,
-Jon
0
 
LVL 16

Expert Comment

by:The--Captain
ID: 7043992
Probably not the problem, but just a thought...
0
 
LVL 1

Author Comment

by:Leonid99
ID: 7044036
Yes, I did. It's not mtu -- the pings get lost even on small packet sizes
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LVL 3

Accepted Solution

by:
cincin77 earned 300 total points
ID: 7044044
if you have w2k client try to use pathping command instead of ping, it will give you valuable information on the source of the loss(that is the links or the active devices?)
0
 
LVL 1

Author Comment

by:Leonid99
ID: 7047727
it was routing problem with my ISP.
sorry for your time.
cinciny77, nice try, u get your points :))
0
 
LVL 16

Expert Comment

by:The--Captain
ID: 7047936
Please tell us how you ISP explained 70% packet loss as "a routing problem" - this I gotta hear.

Thanks,
-Jon
0
 
LVL 51

Expert Comment

by:ahoffmann
ID: 7049778
.. I'm interested too ..
0
 
LVL 15

Expert Comment

by:samri
ID: 7072323
or maybe it's the carrier is the culprit.
0
 
LVL 16

Expert Comment

by:The--Captain
ID: 7074062
Or maybe it's rabid backhoes - In any case, I wanna know.  leonid has some explaining to do, IMO...

Cheers,
-Jon
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