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You are here: MacNN Forums > Enthusiast Zone > Networking > can't send with Ethernet ADSL and OSX

can't send with Ethernet ADSL and OSX
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Mac Enthusiast
Join Date: Dec 1999
Location: Italy
Status: Offline
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Mar 22, 2003, 11:09 AM
 
I got my adsl connection last week and connected up the ethernet modem that the isp supplied me with (IPM Datacom Speedweb) to my iMac DVSE 400 and everything seemed fine. I was very pleased because it came with no instructions for OSX (not officially supported) only OS9 and windows.

After a while I however discovered that I could not sent e mails unless they were tiny (a few k). If I added an attatchment or wrote a page or two of script they would remain in the out box and I would get an error message telling me to check my mail settings. Unfortunately it is not just with e mails that I have a problem, the software update panel also gives me an error message and in these forums I can only send messages such as this (or reply to others) using my 56k modem connection. If I hit"subit new thread" using the adsl line I get a "cannot connect to the server" error message.

Is there any way to check if the problem is with my modem or with my ethernet? I have checked all or my connections etc and my isp can't seem to help. It seems so strange, normal navigating and downloading are fine.

Any help would be really wellcome
iMac DVSE 400 640mb + AL PB 15" with 1 gig + iMac 2,8 with 4gb + MacBook Pro 2,53 with 4gb
     
Grizzled Veteran
Join Date: Oct 1999
Location: Minneapolis
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Mar 22, 2003, 12:52 PM
 
This might be a MTU problem. The following web page shows you how to fix it on a Linksys.

http://www.longshome.com/Linksys%20MTU%201492.html
     
Fresh-Faced Recruit
Join Date: Aug 2002
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Mar 26, 2003, 09:48 AM
 
hey, I've exactly the same problem, except that it only happens when I add my Compex router into the network. If I'm connected directly to the ADSL modem, everything works fine.
     
Administrator
Join Date: Apr 2001
Location: San Antonio TX USA
Status: Online
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Mar 26, 2003, 02:11 PM
 
Originally posted by kristian:
hey, I've exactly the same problem, except that it only happens when I add my Compex router into the network. If I'm connected directly to the ADSL modem, everything works fine.
Your router probably has its own MTU setting; many do. Find the setting and change it to the appropriate value (probably 1492, since PPPoE eats up 8 bytes from every packet), then restart everything. That should do the trick.

N.B.: The default MTU for most routers is 1500, which works fine with cable modems because they don't use PPPoE. You may have, instead of a numeric input, a choice between ADSL (or simply DSL) and Cable service. Obviously you'd choose the DSL option.

P.S.: What DSL service do you use?
Glenn -----
OTR/L, MOT, Tx
     
   
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