I have establish a site-to-site vpn between a 6500 switch and 2800 router.Every things work fine from the past 2 days but today suddenly the utilization of 6500 switch went to 100% when i remove the crypto statement every things starting to work perfectly.On the peer end the user are getting the accesses through the email.The internet traffic and email are going through the vpn tunnel.I know that this is some sort of fragmentation issue of packet.But i cant understand how to resolve it your suggestions required.Both interfaces are using the MTU of 1500.