re: Question about 'Change the MTU and RWIN Settings in Dial-Up Networking'
Tuesday, October 30, 2001 at 3:11 am
Windows XP Annoyances Discussion Forum
Posted by Patrick
(3 messages posted)
This Registry fix applies to ALL AOL users who installed AOL v4.0 or v5.0 32-bit
software for Windows 95/98, and is aimed to obtain MAXimum transfer speeed on AOL,
with a 28 - 56 kbps analog modem.
This is THE ONLY way you can force AOL 4.0 and 5.0 to use a MTU value other than
1500 or 1472 (default), which is optimized ONLY for LAN/WAN networks, xDSL and cable
and satellite modems, but NOT for analog modems, no matter how you connect to AOL:
using AOL as your primary ISP by dialing one of AOL's local phone numbers available
in your area;
using another primary ISP to log on to the Internet, and then using AOL's TCP/IP
protocol to sign on to AOL.
CREDITS: This workaround was successfully experimented by Arvid J. Bloom (ajbloom@aol.com)
with AOL v4.0, and by Jeff Balliett (SEAL81044@aol.com) with AOL v5.0. Many thanks
for sharing!
THE BUG:
When you install AOL 4.0 or 5.0 on your Windows 9x computer, it creates this new
Registry key, you can see by running Regedit:
HKEY_LOCAL_MACHINE\SOFTWARE\America Online\AOL\aolsock
and in the right hand pane you'll notice one of these DWORD values (default):
mtu 0x000005dc (1500)
or:
mtu 0x000005c0 (1472)
THE FIXES:
You MUST apply this fix [delete the "aolsock" Registry key], and then set your TCP/IP
MTU to 576, as described in the "AOL MAXMTU REVISITED" topic, also in AOLTIPS.TXT,
part of my Win9x/2000/ME/XP + DOS 7/8 ©Tricks + Secrets files [W95-11D.ZIP], to make
all this work properly!
On some Win9x machines you'll also notice this AOL 4/5 Registry key (using Regedit):
HKEY_LOCAL_MACHINE\Software\America Online\AOL\AolsockBack
If your Registry doesn't have this key, you need to create it: start Regedit -> go
to:
HKEY_LOCAL_MACHINE\Software\America Online\AOL
right-click on "AOL" -> select New -> click Key -> type "AolsockBack" (no quotes)
-> click OK or press Enter.
This is the "AolsockBack" MTU DWORD value in the right hand pane (default):
mtu 0x000005dc (1500)
or:
mtu 0x000005c0 (1472)
To create a new "mtu" DWORD (if not present) under "AolsockBack": right-click in
the right hand pane -> select New -> DWORD Value -> name it "mtu" (no quotes) ->
click OK or press Enter.
To change the MTU used by AOL to 576 (for MAX speeed) under "AolsockBack": right-click
on "mtu" -> select Modify -> check the Decimal box -> type 576 -> click OK or press
Enter.
Now restart Windows and log on to AOL.
According to Arvid (using AOL v4.0) and to Jeff (using AOL v5.0), their download
speeds went from 1-2 KB/sec to 4-5 KB/sec, sometimes even faster, ONLY after applying
this tweak!
Have fun.
On Friday, October 26, 2001 at 9:36 am, steve wrote:
>I have a question about Change
>the MTU and RWIN Settings in Dial-Up Networking:
>can I do this for windowsXP? I have looked but can't find them...am I missing something
>or just going blind? LOL
>
>
|
All messages in this thread [show all]
 |  | re: Question about 'Change the MTU and RWIN Settings in Dial-Up Networking' (Patrick: Tue, Oct 30, 2001, 3:11 am) |
|
