A. Ben Hmeda wrote:
I have an Internet router for sharing cable Internet connection. 3 PCs
plugged into this router, class C network, I think. All with static IPs
192.168.1.2,3 and 4. Gateway (router) is 192.168.1.1 DNS is my ISP's
64.71.255.198 I am using 100Mb Ethernet and 10/100Mb router. My Internet
connection speed is only 1Mbps (max) My internet download speeds range
from 90kB/s to 114kB/s. Under Ubuntu, they crawl at 15kB/s to 25kB/s
max! under static IP setup or dhcp setup.
I forgot to mention before, that details about your NIC and kernel may also be
relevant. See below.
The machine with the problem is my AMDSMP. I have had absolutely no
problem with network speed (internal and external) until I installed
Dapper. As it is now, it is a dual booting machine (win2k and ubuntu)
The point I was trying to make is to determine whether the problem (with Ubuntu)
exists in the LAN traffic as well as in the internet connection traffic.
Whether the slowdown also occurs in LAN traffic, or alternatively, only with
internet traffic, this information would tend to narrow down the problem a great
deal and could help point to the cause.
Previously, it ran Debian Sarge, Fedora Core 4 and 5, alongside win2k
without any problems. Presently, my network speed is fine under windows,
was fine under Sarge, Fedora 4 and 5 on the same machine, except for ubuntu.
Although that makes physical layer issues less likely, it doesn't eliminate
them. The only way to completely eliminate physical layer issues is to swap
cables, router ports, and (lastly) NICs. These kinds of tests should probably
be the first things to try because they are so easy to do, although they have a
very low probability of being the cause.
As I was poking around, trying to figure this out, I noticed that
network speed is drastically improved, back to 90kB to 114kB under
Ubuntu when, in GNOME, I open the System>>Administration>>Networking and
just click OK, without actually changing anything! This makes no sense
to me and I have no explanation for it, it certainly does not change the
content in my /etc/network/interfaces but I was able to duplicate the
steps with same results every time. Is the
System>>Administration>>Networking>>OK the same as
/etc/init.d/networking restart?
I don't know, but you could find out by executing the command on the CLI as
root. If it fixes the problem then it could be a NIC driver initialization
issue. Then you should start experimenting with different drivers and NICs to
narrow down the cause. Otherwise we may not be able to exclude the "ghosts"
hypothesis proposed by another list member. :O
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- Re: Very slow network - Ubuntu Marty
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