topic VPN Traffic slow in Network Security https://community.cisco.com/t5/network-security/vpn-traffic-slow/m-p/1367989#M729715 <P>Dear Team,</P><P></P><P>My customer is having 8mb lease line.</P><P></P><P>The site to site vpn is created between ASA 5520(Near Side) and ASA 5540(Far side).</P><P></P><P>The mail and other erp applications are running through the tunnel. All the servers are located in far side.</P><P></P><P>The normal traffic(outside the tunnel) is good. Am able upload and download 17 Mb file within 1 minute.</P><P></P><P>But the traffic within the tunnel espescially mail traffic is very very slow. To download 8 Mb file, it takes approx. 25 minutes.</P><P></P><P>Any guidance to solve this issue.</P><P></P><P>Thanks and regards,</P><P>Divya</P> Mon, 11 Mar 2019 17:14:11 GMT consult_srishti 2019-03-11T17:14:11Z VPN Traffic slow https://community.cisco.com/t5/network-security/vpn-traffic-slow/m-p/1367989#M729715 <P>Dear Team,</P><P></P><P>My customer is having 8mb lease line.</P><P></P><P>The site to site vpn is created between ASA 5520(Near Side) and ASA 5540(Far side).</P><P></P><P>The mail and other erp applications are running through the tunnel. All the servers are located in far side.</P><P></P><P>The normal traffic(outside the tunnel) is good. Am able upload and download 17 Mb file within 1 minute.</P><P></P><P>But the traffic within the tunnel espescially mail traffic is very very slow. To download 8 Mb file, it takes approx. 25 minutes.</P><P></P><P>Any guidance to solve this issue.</P><P></P><P>Thanks and regards,</P><P>Divya</P> Mon, 11 Mar 2019 17:14:11 GMT https://community.cisco.com/t5/network-security/vpn-traffic-slow/m-p/1367989#M729715 consult_srishti 2019-03-11T17:14:11Z Re: VPN Traffic slow https://community.cisco.com/t5/network-security/vpn-traffic-slow/m-p/1367990#M729722 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P></P><P>I am suspecting, that it might be MTU issue.In IPSec tunnel, firewall has to fragment the packets to fit them into the tunnel.because of this, the sending and recieving traffic will be slow.</P><P></P><P>The easiest way to find out would be to adjust the MTU of&nbsp; ur mail server and see if that makes any difference or check your tunnel MTU size and your mail server MTU size.</P><P></P><P>regards</P><P>karuppu</P></BODY></HTML> Wed, 24 Feb 2010 14:23:55 GMT https://community.cisco.com/t5/network-security/vpn-traffic-slow/m-p/1367990#M729722 KARUPPUCHAMY MALAIYANDI 2010-02-24T14:23:55Z