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Internet -Zyxel ADSL Router - Lan 1 - Cisco PIX 501 Firewall - Lan2

our company Internetaccess looks like this:

Internet ->Zyxel ADSL Router -> Lan 1 -> Cisco PIX 501 Firewall -> Lan2

we have problem to built up a VPN Network Connection from the Internet to the Lan2

1. we can built up a VPN Connection from a CISCO client from the Internet. We receive a dyn. IP Adress from the LAN2 Subnet, But we can not Ping any computer within LAN2

2. From Lan 1 we can built up a VPN connection to Lan 2, works fine.

3. From ISP we receive a dyn. IP Address for the Zyxel ADSL Router which Routes it by setup SUA to the CISCO Firewall. works fine

4. From Lan 2 we have internet - Access, ok

5. From Lan 1 we have Internet - Access,ok

6. The access to Internet/Lan2 from Lan1 is not needed in the future, just for debugging issue.

Any help is really appreciated. Since we are struggeling with that since days. How does the routing needs to be setup?

thanks Chris

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