67 lines
2.1 KiB
Text
67 lines
2.1 KiB
Text
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Redundant routers control
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I'm using two Linux routers at home, along with a manageable switch and an ADSL
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modem.
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Both routers have their own address, and so does the switch. When one of the
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routers is active, it uses an additional address which serves as the default
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gateway for the rest of the boxes.
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One of the routers is an old box; it's rather slow, doesn't have much memory,
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and more importantly, it's dying. Obviously, it should only be used when the
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other one is down. However, if the connection has been established by that
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secondary router, the primary should not take over until the DSL link goes down
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on its own.
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The scripts in this directory are used to control which router is active.
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Checks on the primary router
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When the primary router is the active router:
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1/ Check the switch
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2/ If the switch is down, deactivate.
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When the primary router is inactive:
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1/ Check the switch and the main router address
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2/ If the switch is up and the main router does not exist, activate.
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Checks on the secondary router
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-------------------------------
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When the secondary router is the active router:
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1/ Check the switch, the primary router, and a remote server
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2/ If the remote server is reachable, do nothing
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3/ If the switch is down, or if the primary router is up, deactivate.
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When the secondary router is inactive:
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1/ Check the switch, the primary router, and the main router address
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2/ If the switch is up, and both the primary router and the main router
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address are down, activate.
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Installation
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1/ Copy router-checks.conf to /etc, modify it however you want.
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2/ Copy share/ to /usr/local/share/router-checks (or to whatever you set the
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LIB_DIR configuration variable to).
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3/ Modify activate.sh and deactivate.sh; they determine how a router becomes
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the primary router and how a router releases primary routing control,
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respectively.
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4/ Copy primary-router.sh or secondary-router.sh to
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/usr/local/sbin/router-checks
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5/ If necessary (and if it will work on whatever distribution you use), use
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the provided init script to start the checks on boot.
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