Over the last week one of our off site employees has had their vpn connection dropped quite often, and without explanation. This employee is at a client's site, and uses their private network to access our network, which is connected. This individual is the only person of about 15 who is experiencing this to my knowledge, but it has been going on for at least 3 days.
The employee's laptop has VPN Client 3.5.1 on it, and is connecting to a 3005 concentrator. I asked the employee to log the client, and send me the results when kicked off. The following caught my eye, and makes me wonder what's happening in the following log lines (IP changed for confidentiality, but is concentrator outside IP):
Check if the "start before logon" feature is enabled on his client. Also it is very common for isps to reasign ip addresses on a regular basis. This could be a reason too. You could also try reducing the MTU size setting on your VPN client, this would eliminate the chances of packets being dropped in the tunnel.
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...