Help mith LAN and MyWireless

[Michael128]

I am having trouble visiting some sites
(e.g. www.spiegel.de) when my copmuter is not conected directly but rather via my LAN. This is only the case when I'm connected with myWireless. The site works perfectly fine when I connect the modem directly to my computer but doesnt load when I try loading it via the LAN.
If anyone can help, Id appreciate it!!
I'm not very technically minded, so if you can help try and keep the replies in english [^]

 

[JAS]

Short answer: Use DrTCP to set the MTU on your client PCs to 1458. For more detail, see me posting in http://www.myadsl.co.za/forum/topic.asp?TOPIC_ID=3947 .

 

[dbnnet]

I would suggest even a lower value say 1450

Or if you want a long winded explanation ...read on:

MTU - The best way to test for an optimum MTU setting is to do a simple DOS Ping test. Simply send ping requests and progressively lower the packet size until the packet fragmented error goes away!
Note: MW Users may well find that a lower MTU may be better for their particular circumstances.

Here is what you do:

ping -f -l 1472 www.sentech.co.za (That is lower case F and L)

Then continue testing, reducing the 1472 in unit’s of 10 until you no longer get any fragmented error messages. Then start increasing by 1 until you reach a figure without fragmented errors. In my case,
with a D-Link DI-604 router I found it to be 1422.
Now… add to this a figure 28 (IP/ICMP header of 28 bytes) and this is your Max MTU. I.e. in my case 1422+28=1450
Ensure that the Router and ALL your PC’s now have the same MTU (i.e. 1450) setting.

When using PPPoE, your maximum MTU setting should never be greater than 1492.
If you get your MTU wrong, uploading, or browsing, may not just be sluggish… it may well freeze, or not work at all!


<font size="1"><font color="black">Bay of Plenty :</font id="black"><font color="blue"> Signal 48% - SNL 17 - ber 71% :</font id="blue"><font color="green"> D-Link DI-604 - PPPoE :</font id="green"><font color="orange"> 8dBi Patch Antenna :</font id="orange"> Firmware 5.0.1.60</font id="size1">

 

[Michael128]

Thanks so much guys!!!

Will try get it working tomorow.

 

[Michael128]

I tried doing the ping test and it tells me: "Packets need to be fragmented but DF set" . I then decresed the MTU like you told me but then I started getting: "Request timed out" messages. What do I do now?

Thanks

 

[dbnnet]

You will get "some" Request timed out messages (This is after all Sentech!!!)
If you are ONLY getting timed out messages... then this is something else.

The important thing is that you want to reduce the MTU count until you
don't get ANY Fragmented errors.

<font size="1"><font color="black">Bay of Plenty :</font id="black"><font color="blue"> Signal 48% - SNL 17 - ber 71% :</font id="blue"><font color="green"> D-Link DI-604 - PPPoE :</font id="green"><font color="orange"> 8dBi Patch Antenna :</font id="orange"> Firmware 5.0.1.60</font id="size1">

 

[Michael128]

Well, if I run the ping test about 10 times, I get about 1 message that is not a request timed out msg. Anyway I found my MTU to be 1458 set it and everything is working fine now. THANKS!

By the way... what is the MTU value anyway? what does it do?

 

[loosecannon]

on a pppoe link you will have a MTU of 1492 as sentech uses L2TP you will need to lower the MTU further to accomodate the tunnel headers ...

glad it is working ...