Oct 21, 2019 · ASA: Site-to-Site VPN with NAT/PAT Interesting Traffic Hi, I would like to get some help with troubleshooting a Site-to-Site VPN connectivity between two ASAs on a lab environment (GNS3). I have the VPN set up on each site to NAT/PAT their internal subnet to a specific IP address, but it does not work.
En un firewall Cisco ASA con una versión de software 8.3 o mayor, para hacer un no-NAT, es necesario realizar un NAT de una red sobre esa misma red, pero en un ASA con una versión inferior, se utiliza el número de nat “0”: Clearly Check Point is doing something different in IKEv2 between R80.10 and R80.30 that is tripping up the Cisco ASA in regards to NAT-T; I couldn't see anything that would cause a peer gateway to determine NAT-T was required. The Peer ID IP address and source IP address on the IKE packets matched exactly. These are not formal definitions but if you are familiar with the Cisco ASA, then you know things changed drastically between ASA version 8.2 and 8.3, one of them being NAT. Side talk : don’t tell the customer but I once downgraded a customer’s firewall from ASA version 8.3 to 8.2 just so I didn’t have to worry about the NAT syntax change. Apr 15, 2012 · Cisco ASA Site-to-Site VPN Configuration (Command Line): Cisco ASA Training 101 - Duration: 14:11. soundtraining.net 237,773 views My way means I have to allow more ports for domain membership etc, but, if you have a Cisco ASA I’ve covered that in the following article, Cisco ASA – Allowing Domain Trusts, and Authentication. As for the VPNs and RADIUS you need to allow the following; From Outside to the RAS Server. UDP 500 (ISAKMP) UDP 4500 (NAT Traversal)
The idea is to do a Policy NAT for the VPN traffic to change your 10.1.0.0/16 to 192.168.50.0/24 if it is tunneling over the VPN. Cisco has a great writeup on how to do this: LAN-to-LAN VPN with overlapping subnets. There's a blog post here as well if you are using a later ASA version: ASA VPN with overlapping subnets. Hope that helps.
May 23, 2017 · This can be acomplished with Network Address Translation (NAT) as explained in the following sections. Translation on both VPN Endpoints . When the VPN protected networks overlap and the configuration can be modified on both endpoints; NAT can be used to translate the local network to a different subnet when going to the remote translated subnet. ASA 1 The big question here is, can the ASA NAT the source address of a particular host coming across a VPN tunnel (Outside Interface) going to my (Inside interface). If so it will allow me to control the customers host IP address such that it will never overlap I hope I made sense here, if I need to draw a diagram and can do one quickly. Jan 17, 2014 · The VPN router is behind a NAT device that translates its VPN interface using PAT. The configuration on our ASA remains the same (the configuration we did for main mode). We will translate the Fa0/0 interface (192.168.12.2) on the VPN router to the Fa0/0 interface IP address of the NAT router (10.0.0.2). If you have other traffic on the vpn going through the tunnel that does not require nat, then you need to add outside nat exemption rules since these lines above forces all traffic through the asa to have a nat statement. See if this works for you, else post your nat config here. View solution in original post 0
Jan 17, 2014 · The VPN router is behind a NAT device that translates its VPN interface using PAT. The configuration on our ASA remains the same (the configuration we did for main mode). We will translate the Fa0/0 interface (192.168.12.2) on the VPN router to the Fa0/0 interface IP address of the NAT router (10.0.0.2).
Apr 15, 2012 · Cisco ASA Site-to-Site VPN Configuration (Command Line): Cisco ASA Training 101 - Duration: 14:11. soundtraining.net 237,773 views My way means I have to allow more ports for domain membership etc, but, if you have a Cisco ASA I’ve covered that in the following article, Cisco ASA – Allowing Domain Trusts, and Authentication. As for the VPNs and RADIUS you need to allow the following; From Outside to the RAS Server. UDP 500 (ISAKMP) UDP 4500 (NAT Traversal) Here we are done configuring Palo Alto Firewall, now we can configure the Cisco ASA on the other end to successfully establish the IPSec VPN Tunnel. On Cisco ASA Firewall: Similar to Palo Alto Firewall, it also assumes the Cisco ASA Firewall has at least 2 interfaces in Layer 3 mode. Configure IPSec Phase – 1 on Cisco ASA Firewall.