Adding New Networks to Cisco AnyConnect VPNs
Sep17

Adding New Networks to Cisco AnyConnect VPNs

KB ID 0001593 Problem Note: To add new subnets to a traditional Site to Site VPN, see the following article instead; Cisco ASA – Adding New Networks to Existing VPNs I see this get asked in online forums A LOT. If you have an existing AnyConnect VPN setup, and then need to add another network how do you do it? Well that depends on where the new network is, and how it’s entering the firewall, these diagrams can be either way...

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Cisco ASA: NAT 2 Public IPs to 1 Private IP
Aug20

Cisco ASA: NAT 2 Public IPs to 1 Private IP

KB ID 0001582 Problem I got asked today if this could be done. My first response was ‘why?’ I cant really think of a use case for this. But a client had this on their previous firewall and were migrating to a virtual ASA, and wanted the config replicating. So I built something like this; Solution To be fair, my first thought was ‘why not simply add an additional internal IP to the web server, and NAT the second...

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Cisco SFR Cant Ping its Default Gateway?
Jul25

Cisco SFR Cant Ping its Default Gateway?

KB ID 0001575 Problem This is a strange one? I was deploying FirePOWER to a pair of ASA 5550-8-X firewalls in Active / Standby failover last week. After each SFR was updated (via ASDM.) I could no longer ‘ping it’, the SFR itself could ping everything on the same VLAN, APART from its own default gateway, (which was an SVI on the Cisco 3750 switch it was connected to). This happened every time I updated the SFR, (or...

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Windows 10: Cisco ASDM ‘This app can’t run on your PC’
Jul19

Windows 10: Cisco ASDM ‘This app can’t run on your PC’

KB ID 0001574 Problem Whys isn’t Java dead yet? 🙁 Anyway, I tried to connect to a clients ASDM today, and from my Windows 10 machine, I got the following error; This app can’t run on your PC To find a version for your PC, check with the software publisher. Solution If you are launching straight for the desktop open the properties of the ASDM shortcut, and look at the ‘Target’ value. Change it to;...

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Cisco ASA: “Wrong Serial Number?”
Mar27

Cisco ASA: “Wrong Serial Number?”

KB ID 0001530 Problem Cisco have done this for a while, the first time I saw it was years ago on a 5585, but all the NGFW models now have a ‘Serial Number” and a “Chassis Serial Number”. Normally you don’t care unless you need to log a TAC call online. So you issue a show version command, take a note of the serial number, and then it says, there’s no record of that serial number? Solution Just to be...

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Cisco 5506-X / 5512-X SFR Unsupported
Feb26

Cisco 5506-X / 5512-X SFR Unsupported

KB ID 0001522 Problem After upgrading an ASA 5506-X to Version 9.10, I was about to re-image the FirePOWER SFR module. I went to load the boot image and this happened; sw-module module sfr recover configure image disk0:/asasfr-5500x-boot-6.3.0-3.img ^ ERROR: % Invalid input detected at ‘^’ marker. At first I thought “Oh great, the syntax has changed, there’s another post to update”. But no, the command is...

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