Slow internet after upgrade to Ubuntu 8.04

balls · 04-26-2008, 01:14 AM

I upgraded to Hardy Heron earlier today, and got my internet up and running fairly quickly, but found out that my internet was running outrageously slow (a minute plus to load google, mozilla, and wikipedia). I've tried disabling IPv6 and manually setting my DNS servers to no avail. On http://www.dslreports.com/speedtest my latency is 34 ms, download speed is 5434 kb/s, and upload speed is 434 kb/s. I don't think that my internet connection is to blame, considering that I'm on my laptop right now with no problems at all.

Output from ifconfig is as follows

Code:

eth0      Link encap:Ethernet  HWaddr 00:04:4b:02:62:5c  
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
          Interrupt:221 Base address:0x8000 

eth1      Link encap:Ethernet  HWaddr 00:04:4b:02:62:5d  
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
          Interrupt:222 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:134 errors:0 dropped:0 overruns:0 frame:0
          TX packets:134 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:8433 (8.2 KB)  TX bytes:8433 (8.2 KB)

wlan0     Link encap:Ethernet  HWaddr 00:12:17:9b:73:a2  
          inet addr:192.168.1.100  Bcast:192.168.1.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2087 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1544 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:1069210 (1.0 MB)  TX bytes:165182 (161.3 KB)

wmaster0  Link encap:UNSPEC  HWaddr 00-12-17-9B-73-A2-00-00-00-00-00-00-00-00-00-00  
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

Any help at all would be appreciated. Thanks in advance.

pccdrussell · 04-26-2008, 07:37 PM

Hello, I have seen this as well. Its somewhat of a bummer being that Ubuntu is my favorite distro. But they do have a major problem with that. As in my environment, I have multiple non *buntu machines that do not do this. Anyway, give this a shot, it should do the trick.

Edit the file.... /etc/sysctl.conf and add the following lines to the end of the file.

# Tweaks for faster broadband...
net.core.rmem_default = 524288
net.core.rmem_max = 524288
net.core.wmem_default = 524288
net.core.wmem_max = 524288
net.ipv4.tcp_wmem = 4096 87380 524288
net.ipv4.tcp_rmem = 4096 87380 524288
net.ipv4.tcp_mem = 524288 524288 524288
net.ipv4.tcp_rfc1337 = 1
net.ipv4.ip_no_pmtu_disc = 0
net.ipv4.tcp_sack = 1
net.ipv4.tcp_fack = 1
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_timestamps = 1
net.ipv4.tcp_ecn = 0
net.ipv4.route.flush = 1

Save and quit.....and then run..

Code:

sudo sysctl -p

Test your internet speeds again. You should at least see a little bit of difference, but if its still not up to your likings...Replace all the 524288's with 262144.

Hope this helps!

balls · 04-26-2008, 11:31 PM

Hey, thanks for the response.

I just tried this and had no luck. I tried pinging google but timed out.

pccdrussell · 04-27-2008, 05:22 PM

Shoot, Im not sure why that would have made you gone from slow to no connectivity whatsoever? I'll put my thinking cap on, but not sure. Anybody else out there any ideas?

coolclassic · 05-29-2008, 07:25 AM

Try changing window scaling to 0 in the above

debuser123 · 07-11-2008, 12:39 PM

Also try disabling timestamps

Code:

# echo 0 >/proc/sys/net/ipv4/tcp_timestamps

I had the same problem, takes about a minute or more to load a page, and noticed there were tcp checksum errors left & right. Disabling timestamps instantly fixed it.

Add this to your /etc/sysctl.conf so it happens on reboot

Code:

net.ipv4.tcp_timestamps=0

Reference

Harry N · 07-19-2008, 08:21 AM

This, my very first post is merely to allow me to introduce a link in the next one

Harry N · 07-19-2008, 08:22 AM

I had this same problem a few days ago, maybe after an update(?).
The (video)advice from :
http://www.revver.com/video/462429/h...in-ubuntu-710/
did the trick for me. Here is what to do in writing:

In a terminal
sudo gedit /etc/modprobe.d/aliases
password........

look for the line: alias net-pf-10 ipv6
copy and paste it, comment one out:
#alias net-pf-10 ipv6
and edit the other one to
alias net-pf-10 off

Save and reboot, good luck