FMCv – Change IP Address

Welcome Back 😉

Think about this for a bit, its been years ago when we first configured the our Cisco FMCv in our virtual environment perhaps this is running for years with no problems. (Lucky us!) All of our firewalls connect to it, policies are pushed correctly, IPS rules are updated correctly and we even have URL filtering turned on some devices, and upgrades work out of the box, it just works, again lucky us! We have remote backups working but we never needed them…

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Dual ISP – Cisco ASA HA Active/Standby

So a single ISP isn’t cutting it anymore you need a backup just in case the primary fails and might as well add a second ASA into this design, more redundancy equals more up-time, right? On paper it sounds good but in the “real” world there probably is tipping point, more redundancy increases complexity. In this post we’ll aim to keep it simple, with setting up a Cisco ASA HA active/standby pair and then add in the second ISP. Let’s get started!

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Automation Dance

people enjoying the concertI keep doing the automation dance, there are a lot of different tooling products out there. I have been trying to understand a use case around using it with network automation. Recently I have been dancing around with Ansible. My personal belief is that using any type of these tools would be helpful but it can be a steep learning curve if you really don’t have any programming knowledge. This is not something that is relatively easy to use or understand, don’t expect to have a working network automated tool in production on day one. I think this is great for learning, and using this in a network sandbox. If you don’t have programming mindset it might make your job harder on day one before it gets easier, but just like learning to dance you have to learn the steps, the moves, and maintain the rhythm. So with that let’s at least figure out the starting points, and begin learning the steps of the automation dance. 😉 Continue reading “Automation Dance”

Too Many TCP Resets

So, recently we enforced some firewall rules on a new environment, we did testing of the environment and everything was working as expected. In about 24 hours a lot of traffic from the web infrastructure was being denied and it continued, at first glance it looked like return traffic was being dropped, the web servers were sourcing at port 443 and the destination ports were using dynamic ports (RFC 6335)

No user or application problems were reported when we enforced rules, and we waited additional days to see if anything came up. Nothing came up, the only thing was a spike in amount of syslog messages of dropped traffic coming from the web servers. So from that point it really wasn’t an issue, but I thought it would be interesting to see what was going on. Continue reading “Too Many TCP Resets”

ASA Site to Site VPN (DHCP)

If you don’t already know, site to site VPNs can be a cost-effective way for remote sites to connect to HQ resources instead of a lease line like using MPLS or Metro-E circuits. We can instead use a standard internet connection with a static IP, this is usually cheaper than a dedicated circuit. Our next steps are purchasing a firewall for the remote site (assuming you already have one at HQ) and setup a site to site VPN connection to make the connection. Continue reading “ASA Site to Site VPN (DHCP)”