Router redundancy scripts

routers/share/activate.sh

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+#!/bin/bash
+
+#
+# Example router activation script
+#
+# 1/ Remove default route through peer
+# 2/ Take active router address
+# 3/ Activate PPP link
+# 4/ Wait for a few seconds
+#
+
+ip route del default via 192.168.1.1 dev eth0
+ip addr add 192.168.1.1/24 dev eth0
+ifup ppp0
+sleep 10

routers/share/deactivate.sh

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+#!/bin/bash
+
+#
+# Example router de-activation script
+#
+# 1/ Kill internet link
+# 2/ Nuke them from orbit, it's the only way to be sure
+# 3/ Release main router address
+# 4/ Add default route through peer
+#
+
+ifdown --force ppp0
+sleep 2
+killall -9 pppd
+sleep 2
+
+ip addr del 192.168.1.1 dev eth0
+ip route add default via 192.168.1.1 dev eth0

routers/share/pings

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+#!/bin/bash
+
+try_ping()
+{
+	export target="$1"
+	export prfile="$2"
+	export endfile=`mktemp`
+	(
+		if ping -c1 $target >/dev/null 2>&1; then
+			rm -f $prfile
+		fi
+		rm -f $endfile
+	) >/dev/null 2>&1 &
+	echo $endfile
+}
+
+wait_pings()
+{
+	local ok=0
+	while [ "$ok" = "0" ]; do
+		sleep 1
+		ok=1
+		for file in $*; do
+			if [ -f "$file" ]; then
+				ok=0
+			fi
+		done
+	done
+}