Connection To Internet Problems (SOLVED)

[Detonate]

Re: Connection To Internet Problems

Did you try Johan's suggestion here:

I see that your router is 54 MB capable and your wlan connections says it has a rate set at 9 MB/s. You can raise that, but I don't think it's going to solve your problem.

sudo iwconfig wlan0 rate 54M auto

As he said, it may not help, but it's worth a shot.

[otisklt]

Re: Connection To Internet Problems

Why don't you try installing the bind9 package as referenced in the other thread to see if you have a difference or not?

I have had it make a difference for me but I did not go thru the ping tests.

[chrishoyle]

Re: Connection To Internet Problems

I think i may have had some progress with this, i re-installed XP but repartitioned the hard drive so that i could also install kubuntu later. Anyway, once windows was installed i had the same internet connection problems. Fortunatley, I'm a bit more competent in diagnosing windows connection problems. The problem was the MTU settings. I set them to be the same as my desktop PC which shares the connection and hey presto it works!

Now all i need is a linux version of DRTCIP or know how to change the MTU & Rwin settings and i think that will sort it!

[JohanLingen]

Re: Connection To Internet Problems

You can adjust the MTU by issuing

sudo ifconfig eth0 mtu 1500

I wonder however why you are changing it?

To change receive window: Powertweak seems to have what you need, else follow this guide: http://www.santa-li.com/linuxonbb.html

If it's not too much trouble, could you post a speed benchmark with the settings you have tried with Kubuntu (of course eleminate differences between linux and your shared connection or connect linux directly to the internet).

[chrishoyle]

Re: Connection To Internet Problems (Solved!!!!!!!!!!!!!)

Definitely MTU settings!!!!!

changed MTU from 1500 to 1492 which is the same as my desktop running windows and i am back to superfast 8MB broadband. Talk Talk, my broadband provider recommend a setting of 1432 i think so i may tweak it lower, However it works fine for now. i couldn't post a speed report before i changed the settings cause it just crashed however this is the tweak test results from dslreports.com is this what you wanted Johan?

Your Tweakable Settings:

Receive Window (RWIN): 479168
Window Scaling: 6
Path MTU Discovery: ON
RFC1323 Window Scaling: ON
RFC1323 Time Stamping: OFF
Selective Acks: ON
MSS requested: 1452
TTL:
(less any hops behind firewall)
64
TTL remaining: 50
TOS flags: none set

Test Download:

Actual data bytes sent: 1024001
Actual data packets: 713
Max packet sent (MTU): 1492
Max packet recd (MTU): 1400
Retransmitted packets: 0
sacks you sent: 0
pushed data pkts: 28
data transmit time: 2.837 secs
our max idletime: 244.0 ms
transfer rate: 306665 bytes/sec
transfer rate: 2453 kbits/sec
transfer efficiency: 100%

ICMP (Ping) Check:

Minimum ping: 114.69 ms
Maximum ping: 117.26 ms
Ping stability:
115.97 115.82 116.08 115.52 115.10 114.69 115.89 115.35 115.31 117.26

Recommendations:

Choose Rwin between 75504 & 200376
See Tweaks/Unix Page
Read the Tweaks FAQ

Observations

Upload Packet less than your MTU
Good Data Stream

If you want me to try a particular speed test let me know, apart from that problem solved, now to try and get the laptop to access my windows machine...........

Thanks to all for your help & suggestions

Chris

[JohanLingen]

Re: Connection To Internet Problems

you're welcome

I was wondering what speed benefit you are experiencing from setting MTU to 1492 rather than standard 1500?

[Detonate]

Re: Connection To Internet Problems

Some ISPs need a small overhead to work correctly. Especially PPoE. Some information about the client is transmitted in that overhead. I don't understand the technical details, but that's what I have read on other sites.

[chrishoyle]

Re: Connection To Internet Problems

I'm not sure I understand it either, especially for such a large change in speeds. Before the changes I was getting between 100b/s & 1kb/s, now I'm getting between 600kb/s & 850kb/s according to the Konqueror Web Browser.

Chris