ROSv7 Tutorials

BlackHole General Topics

1000px-Tools.svg MikroTik Tools

sky-lights-space-dark Layer 2

Switch-schematic-image.svg SwitchOS

router-29825_960_720 Routing

Treval MikroTik VPNs

firewall-29503_960_720 MikroTik Firewalls & Security

Svengraph_Lab LABs

1280px-Black_hole_Cygnus_X-1 OSPF

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9 thoughts on “Tutorials

  • homer smith

    What’s your consulting rate?

    Thank you for the OSPF stuff. Clearest stuff on the net.

    Perhaps you could oblige me.

    We have a baseball diamond shaped network with two feeds to the internet, one to home base, and the other to second base. It is set out pretty much like your basic configuration in the first tutorial, except it forms a routed loop. There are other routers connected to the various bases, and some connections ‘shorting out’ parts of the diamond, for example a link from second directly to home, different from the second -> third -> home, or second -> first -> home. It is getting messy as
    we install wireless connections where we can and try to cross connect all of them.

    The goal has always been redundancy when things go down, and load balancing when we need to distribute the load. OSPF has been a bit of a bucking bronco, but it works.

    My problem has been two fold.

    1.) How do default routes work. We presently have them hard coded into each router as a static route, but clearly if an outgoing link fails along the default route, the sending router will not
    intelligently shift its default route to another link. Does OSPF take care of this transparently by changing the default route for us?

    2.) If both links are up, say from 2nd base to home, but we want the traffic to go out one of the links and not the other, (unless it is down) what is the standard way of telling OSPF this?

    3.) Is there a way to tell OSPF to take ‘the same route back to the customer’ that it used on
    the outgo, or is that meaningless?

    4.) When there are two equal routes to take to an end point, will OSPF load balance automatically, if so how do we STOP that.

    Pointers to RTFM are welcome.

    Your stuff is the clearest to date. If there is a better way to e-mail you than this public comment let me know.

    Homer W Smith
    CEO Lightlink.com internet