Proxy/Firewall Settings for Cisco VPN Clients with NAT-T
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Problem: Users cannot obtain access to remote VPN concentrators or routers on the Internet, from the company LAN.
Solution: To permit access to external Cisco (IPSec) VPNs, the company firewall must be configured to permit the following IP ports to the internet destination of the router end-point.
UDP 500
UDP 4500
UDP 10000
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