Tag: HA Architectures

  • Highly Available Firewalls and Proxies in Azure

    New and old technology usually don’t work well together. Trying to connect your Betamax video player to an OLED screen may be a challenge. It will work, but how? The same principle applies to traditional firewall setups in the cloud. With the virtualization of the networking stack not all features available in physical networks are…

  • High-Available Architectures and SLA impact

    Basis of SLA’s An SLA is an agreement on service availability, performance and responsiveness. In this paper, only the availability SLA part is addressed. When indicating SLA’s however in this document, we are talking about the Minimum time a service or component needs to be available, or the maximum time allowed to be down. When…

  • Highly Available Azure GW’s and Juniper SRX

    Pretty quietly Azure has released the option of using redundant VPN connections. In this case, the gateway in Azure actually gets 2 external IP addresses that our on-premises Firewall can connect to. In this chapter, a small update on the Juniper SRX, BGP to Azure post. So that after following this guide, you can actually…

  • Redundant SRX Junos to Azure VPN with VNET Peering

    Ever since playing with BGP I was looking for a way to make redundant tunnels. As the local internet provider here would only allow me a single IP address, I looked at the other side. What if we have two Azure regions that have a VPN tunnel to my SRX and between each other. Routing…

  • Azure Network Architectures (Marketplace FW's)

    Many companies struggle with concepts of “cloud networks” and how it relates to their on-premises networks. How do you deploy a firewall in there, with multiple subnets? Do we need multiple VNET’s and what about those subnets? Well, this post is about what you actually need to understand prior to deploying 3rd party firewalls (and/or VNets) and…

  • Geo-Clustering

    Geo Clustering exists in many options, and dependent highly on the requirements and technical capability. This post is to discuss some options and things to consider before deploying any geo-cluster. Data GEO- Redundancy The first dependency in clustering is storage capability. Data from the workload in the cluster will be written to disk and that…