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VPN (PIX) packet loss

We have recently witnessed packet loss over one of our IPSec tunnels. Peer to peer (router to router) tests return no p-loss, but ICMP traffic over the tunnel experiences 15-20% packet loss. This is an intermittent issue and affects all services, not just ICMP. Any thoughts outside a potential ISP issue?

We have a PIX 525 connecting to a Check point FW. There is a NAT process (/24 static) run on the 525 for the source traffic.

Thanks in advance

  • Other Security Subjects

Re: VPN (PIX) packet loss

Often times complex troubleshooting issues are best addressed in an interactive session with one of our trained technical assistance engineers. While other forum users may be able to help, it’s often difficult to do so for this type of issue.

To utilize the resources at our Technical Assistance Center, please visit and to open a case with one of our TAC engineers, visit

If anyone else in the forum has some advice, please reply to this thread.

Thank you for posting.