I have a static IP, comcast DSL router, ASA behind the dsl router, trying to VPN through the internet using the Cisco VPN client. On the DSL router I have port forwarded UDP 500, UDP 50, UDP 4500, TCP/UDP 10,000 to the ASA but it is unresponsive. If I am on the local (outside VLAN) on the ASA I can connect OK to the inside VLAN using the client but not from the internet. Here is my config, any help is appreciated. Regards, Steve
I'm not so sure I can do that with this router, I'll have to check in the morning it's just an elcheapo dsl router they provide with the service with no more functionality than forwarding and triggering ports. Any workarounds you can think of? Thanks for responding
Can you possibly setup the modem to do a PPPOE passthrough? You would have to configure the ASA for PPPOE, but the ASA has the outside IP address, not the modem. Also I've seen some modem's support a "DMZ" client. It should push all outside traffic to this one IP.
Thanks for the insightful comments, I do believe the problem lies with the forwarding of the ESP protocol which I have been unable to do with any of these internet routers thus far. I have tried putting the ASA's IP in the DMZ to no avail, tried it on 2 different brands of internet routers. A colleage of mine stated something similar to Mr. Feagins, "the outside IP must be the public internet address, if you can't ping that interface from the internet you're not going to be able to VPN through". This is where I'm at so far, and thanks again. Cisco should make an ASA with a telephony interface for DSL
Since start of this discussion I have been looking at word "forwarding" being used. What we need is a passthrough i.e open the required ports on this internet router rather then forward the request to ASA. Say for example if there was a PIX/ASA in fornt of your ASA following acl's would have done the trick:-
access-list acl-out permit esp any host access-list acl-out permit udp any host eq isakmp access-list acl-out permit udp any host eq 4500 access-g acl-out in int outside
So what you really need to do is find a way out to open these ports rather then forward them.
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...