Check the MTU settings..... -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Sharyn Schmidt Sent: Thursday, December 27, 2007 8:17 AM To: [email protected] Subject: RE: [IMail Forum] Ridiculously slow download time with attachments
Ok. This is DEFINITELY a WAN line issue and not an IMAIL issue. I just shut down the serial interface to the remote site and put up ipsec tunnels between my firewall and the one in the remote site having problems. Once the frame circuit and the routers were taken out of the picture, attachments are flowing smoothly and quickly with no issues. -----Original Message----- From: Sharyn Schmidt [mailto:[EMAIL PROTECTED] Sent: Thursday, December 27, 2007 10:40 AM To: [email protected] Subject: RE: [IMail Forum] Ridiculously slow download time with attachments Thanks, Andy. The weirdness is that nothing changed. Nothing! The connection is a frame relay circuit which has been up and running since June of 2007. -----Original Message----- From: Andy Schmidt [mailto:[EMAIL PROTECTED] Sent: Thursday, December 27, 2007 10:18 AM To: [email protected] Subject: RE: [IMail Forum] Ridiculously slow download time with attachments Sharyn, If the problem seems to be specific to certain packet sizes (e.g., the small mail body transmits without problems, but the large mail attachments, such as images, transmit with problems), then there MAY be a problem with MTUsize and/or blocking of certain ICMP types (e.g., 3 Destination Unreachable). If two routers connect, packets may be sent up to the configured MTU size, if that size is too large, then the other router may require that the packet be fragmented and retransmitted - which can cause delays. If the ICMP 3 is not allowed, the sending router may not be aware of the problem and certain size data may never succeed. This is a common problem with PPPoE, tunneled and other connections where additional encapsulation headers will "chip away" from the "net" amount of data that a packet can carry. Don't know if it applies in your case, but worth investigating. Best Regards, Andy To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
