Cisco ASA Redundant or Backup ISP Links with VPNs
KB ID 0000544 Problem This method provides failover to a redundant ISP link should your primary network connection go down. IT IS NOT going to load balance the traffic across both interfaces. In this example I’ve also got a VPN to a remote site and some port forwarding to contend with as well. Where we are at the start. Where we want to be Solution Before you go any further the ASA that will have the backup ISP line,...
Windows Server Setup RADIUS for Cisco ASA 5500 Authentication
KB ID 0000685 Problem Note: The procedure is the same for Server 2016 and 2019 This week I was configuring some 2008 R2 RADIUS authentication, so I thought I’d take a look at how Microsoft have changed the process for 2012. The whole thing was surprisingly painless. I will say that Kerberos Authentication is a LOT easier to configure, but I’ve yet to test that with 2012, (watch this space). Solution Step 1 Configure the...
Cisco ASA to Juniper SRX Site to Site VPN
KB ID 0000710 Problem You want to establish a site to site VPN from a site with a Cisco ASA firewall, to another site running a Juniper SRX firewall. I had to do this this week, and struggled to find any good information to help. In the example below I’m configuring the whole thing from a laptop (172.16.254.206) that’s on the Juniper’s site. Use the diagram below, and substitute your own IP addresses and subnet...
Cisco ASA 5500 – VPN Works in One Direction
KB ID 0000759 Problem The title of this article can cover a multitude of possible causes, however I recently had a strange problem where a client with a remote site protected by an ASA5505 had a VPN tunnel connected to their main site which had an ASA5510. The tunnel established at phase 1, and phase 2, the main site could talk to the remote site, but the remote site refused to talk back to the main site. Update 23/04/19: Seen again...
Cisco ASA – Find Out VPN Tunnel Uptime
KB ID 0000863 Problem I needed to get the Uptime/Duration of a particular VPN tunnel this week. It was for a client with multiple VPN tunnels that was having problems with just one. Solution Option 1 via Command Line 1. Connect to to the firewall > Go to enable mode and use the following command, replace 123.123.123.123 with the IP of your VPN endpoint. PetesASA> PetesASA> enable Password: ******** PetesASA# show...