Networking • Automation • Occasional Podcasting
Inside Greg’s Brain

Networking gear, Ansible playbooks, and a podcast on the side.

Mikrotik tutorials, Ansible Automation Platform deep-dives, and conversations that chase the story behind the person.

Latest posts

  • Mikrotik V5.21 Released

    What’s new in 5.21 (2012-Oct-12 08:25): *) route – fix dst-prefix filtering did not return routes when routes with different routing-mark were present; *) wireless – improved nv2 stability; I’m sure this is greatly appreciated. *) winbox & webfig – added simple new version downloading & upgrading panel; *) dhcp server – immediately store to…

  • Mikrotik Internal Hairpin

    Mikrotik Internal Hairpin

    I’ve gotten questions about this forever and I’m just now addressing it…sorry 🙂 Anyway, the issue occurs when you have two hosts on the same subnet inside your infrastructure. One of the hosts has a service like a webserver. When another host on your subnet attempts to browse via the public NAT’d IP it fails…here’s…

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    Forwarding Your Zimbra Domains

    On one of my Zimbra servers I’ve got a customer with about 8 domains. They are going to be migrating two of their domains elsewhere. While they do this, they want their old email still accessible on the old server. The problem is that if the old domains still exist on the old server and…

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    Mikrotik CCR Rumors

    These are completely unfounded and unsubstantiated, so take them with a grain of salt. So the name of the device is the “Cloud Core Router”. When I hear cloud I first want to vomit and next I think of virtualization. I heard someone say that the CCR boots the Mikrotik ROS into a virtual machine.…

  • TheBrothersWISP 10 – Mikrotik MUM 2012

    TheBrothersWISP 10 – Mikrotik MUM 2012

    JJ, Justin and myself talk about: The CCR – Additional MUM info on the CCR: – – Winbox and config – – ROS V6 info related to CCR New hardware RB2011UAS-RM, RB2011UAS-2HnD-IN, 2.4Ghz Metal AP/CPE, 2.4Ghz miniPCI, and SXT G-5HnD: – Greg’s list – Justin’s list ROS V6 notes: – Greg’s list – Justin’s list…

  • Mikrotik ROS V6 Changes – Janis Megis

    Mikrotik ROS V6 Changes – Janis Megis

    V6 features CCR only for V6. This is the big push. There are announced and unannounced CCR products. This means their are more CCRs on the way. 5.21 is kernel 2.6.35 6.X is kernel 3.3.5+ New Kernel Features New interface driver support. “If you have X86, try V6 to ensure your drivers are included.” Improved…

  • MUM 2012 Multi-Homed BGP
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    MUM 2012 Multi-Homed BGP

    At this year’s MUM I did a presentation on multi-homed BGP. Multi-homed BGP is when your autonomous system peers with multiple internet providers. Peering via BGP with multiple providers allows you to add IP address redundancy, load-balancing inbound/outbound and have greater control of how your addressing is viewed to the internet at large. This covers:…