Re: POP3 Connector Issue

From: MikeMc (mmcelrath_at_earthlink.net)
Date: 03/21/04 

Date: Sun, 21 Mar 2004 11:02:49 -0600

Ran test as you suggested and here are the results:

C:\Documents and Settings\Administrator>ping -f -l 1472 mail.smcusa.biz
------------------
Pinging mail.smcusa.biz [216.119.106.131] with 1472 bytes of data:

Reply from 216.119.106.131: bytes=1472 time=152ms TTL=116
Reply from 216.119.106.131: bytes=1472 time=151ms TTL=116
Reply from 216.119.106.131: bytes=1472 time=151ms TTL=116
Reply from 216.119.106.131: bytes=1472 time=152ms TTL=116

Ping statistics for 216.119.106.131:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 151ms, Maximum = 152ms, Average = 151ms
------------------

I entered the MTU value in the Registry of 1452 today and I will see what
happens over the next 24 hours. 1500 will give the error: "packet needs to
be fragmented but DF set"

MikeMc

"Chris Puckett [MSFT]" <cpuckett@online.microsoft.com> wrote in message
news:rBvFycPDEHA.756@cpmsftngxa06.phx.gbl...
> We have seen these events caused by mismatched MTU's. In some cases it
can
> resolved by adjusting the MTU on the router used to connect to the
internet
> or in other cases you can modify the MTU on the server.
>
> As a test, try running the following command. You can replace the pop
> server name with the ones that you receive the events connecting to.
>
> ping -f -l 1472 mail.smcusa.biz
>
> See if this pings or returns "packet needs to be fragmented but DF set".
> If it returns the second message, then adjust the 1472 value down (in
> increments of 10 for instance) until you find the largest value that
pings.
> If you can ping through with 1472, then the MTU is not likely to be the
> cause. However, you can still check the MTU value in the registry of the
> server to see if it has been set to a value higher than 1500. If the MTU
> value does not exist in the registry then the server defaults to the MTU
> for media you are connecting with which is most likely 1500.
>
> If you receive a request timed out, that server may not respond to pings.
> I experienced this when trying to ping pop.earthlink.net.
>
>
>
> Once you know the largest value that pings, you can manually set the MTU
in
> the registry of the server using the following steps:
>
> If you need to do this on your router, please refer to it's documentation
> for adjusting/setting the MTU.
>
> 1. Click Start, and then click Control Panel.
>
> 2. Double-click "Network and Internet Connections", and then click to
> open the Network Connections folder.
>
> 3. If more than one network connection is listed, for each connection,
> double-click the connection and then click the Support tab of the
> Status interface that opens. The connection that shows a Default
> Gateway entry is probably the network connection that is used to
> connect to the Internet. Note the name of the connection (for example,
> "Local Area Connection 2").
>
> 4. Start Registry Editor (Regedit.exe).
>
> 5. Under the HKEY_LOCAL_MACHINE tree, go to the following key:
>
>
SYSTEM\CurrentControlSet\Control\Network\{4D36E972-E325-11CE-BFC1-08002BE103
> 18}\
>
> 6. Under that key are one or more keys that have numeric identifiers. Each
> of these keys has a Connection subkey. Examine each of the keys that look
> like this:
>
> <ID_for_Adapter>\Connection The Name value in the Connection subkey
> provides the network connection name that is used in the Network
> Connections folder. When you find the one that matches the name that you
> found in step 3, make a note of the <ID_for_Adapter> that the network
> connection name is under.
>
> 7. Return to HKEY_LOCAL_MACHINE, and then locate the following key
>
SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\<ID_for_Adapte
> r> where <ID_for_Adapter> is the number that you noted in step 6. When you
> highlight this key, several values appear on the right side of the screen,
> including DefaultGateway and EnableDHCP.
>
> 8. Right-click the right side of the screen, click New, and then click
> DWORD Value. Name the value MTU.
>
> 9. Double-click the value so that you can edit the value, change Base to
> Decimal, and then enter the largest acceptable MTU size, which is the size
> that you identified by using the Ping tests.
>
> 10. Quit Registry Editor.
>
> Chris Puckett, MCSE
> Microsoft Small Business Server Support
>
>
> This posting is provided "AS IS" with no warranties, and confers no
rights.
>

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