Re: [IMail Forum] POP3 Timeout for Dial-Up Customers

Fri, 18 Feb 2005 09:28:23 -0800

Different router, but it's the same kind (both are Cisco 7204VXRs), and those customers are no longer passing through a router to get to the e-mail.
 
OLD SETUP:
(dial-up customer -> access server -> router -> t1 to public internet -> ds3 to my office -> router -> mail server)
 
NEW SETUP:
(dial-up customer -> access server -> mail server)
 
If the mailbox is small (or it's a broadband customer), getting e-mail is fine.  But if it's dial-up with a large mailbox, it will get to the message that's huge and then just time out.
 
Thanks,
Bryan
----- Original Message -----
From: Darin Cox
Sent: Friday, February 18, 2005 11:01 AM
Subject: Re: [IMail Forum] POP3 Timeout for Dial-Up Customers

Different router?

Darin.
 
 
----- Original Message -----
Sent: Friday, February 18, 2005 11:41 AM
Subject: Re: [IMail Forum] POP3 Timeout for Dial-Up Customers

Ok, but why should I have to change thousands of dial-up customers' Max MTU's all of a sudden when I just moved a mail server from one physical location to another?  It sounds like a problem related to the mail server, not a sudden problem with ALL dial-up users...
----- Original Message -----
Sent: Friday, February 18, 2005 7:46 AM
Subject: Re: [IMail Forum] POP3 Timeout for Dial-Up Customers

We used to see this a lot in the old days with FTP connections dying out on large file transfers. Most windows machines will optimize themselves for a LAN connection. When using a dial-up connection you need to adjust this. the Setting you are looking for is the MaxMTU or IP Packet Size depending on operating system. You can go to www.dslreports.com from the client machine and run the "tweak test" to determine what the optimal setting for that connection would be. For your typical dial-up it will most likely be 576. Also from that site you can grab DrTCP. Run this on the machines and just set the MaxMTU right there. Otherwise it's a search through the registry following specific paths...use the app!! It's a lot easier.
 
Eric S 
----- Original Message -----
Sent: Friday, February 18, 2005 12:25 AM
Subject: [IMail Forum] POP3 Timeout for Dial-Up Customers

I am having a strange problem.  Since I moved my IMail server to the colocation facility that also houses all of my dial-up connections, I have had a flood of calls with people's mail getting hung on large attachments.  The only thing that has changed is the IP address of the mail server and the ethernet switch, obviously.  (No physical changes made to the machine.)  I have also had a ton of people saying Webmail is so slow they can't even use it.  This doesn't make ANY sense to me considering these dial-up customers no longer have to go out through the public internet to get their mail anymore, the server is right there plugged into the same switch as the access servers... If anything, it should have gotten considerably faster.  I guess it's also notable to say that DSL customers (and we in the office) have seen no problems whatsoever, even with large attachments.  It's just on dial-up.
 
If anyone can help at all, I'd appreciate it.  I have poured over the archives and not found anything to help me.
 
Thanks,
Bryan

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