Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

Lost packet with Checkpoint tunnel Client

We are using an applications that relies on Checkpoint tunnel for connection. It starts out by sending 2 identical syn packets out to the server. On monitoring we found that one of the syn packets is being dropped. The packets are not attepting to cross a router. All traffic is in the same network. Our network is based on Catalyst 5000 switches. Two switches are connected by ISL trunk. Can anyone tell me why the second packet is being droped, and how it might be fixed.

  • Other Network Infrastructure Subjects
New Member

Re: Lost packet with Checkpoint tunnel Client

You shouldn't get two identical SYN packets sent. You are only supposed to send one and then perhaps another after a timeout interval if you don't get back a response from the first.

Why do you ask?

New Member

Re: Lost packet with Checkpoint tunnel Client

Apparently this is a security feature. If the first packet gets spoofed, when the second one shows up the system will catch it. This is actually happening with a system we are trying to get running. It has worked when we get the switches out of the picture.