Vladivostok Linux User Group

Код: Выделить всё

# snmpwalk -v 1 -c public 192.168.1.1
SNMPv2-MIB::sysDescr = STRING: Linux (none) 2.4.17_mvl21-malta-mips_fp
...
IF-MIB::ifDescr.1 = STRING: lo
IF-MIB::ifDescr.2 = STRING: eth0
IF-MIB::ifDescr.3 = STRING: usb0
IF-MIB::ifDescr.4 = STRING: nas0
...
IF-MIB::ifOperStatus.1 = INTEGER: up(1)
IF-MIB::ifOperStatus.2 = INTEGER: up(1)
IF-MIB::ifOperStatus.3 = INTEGER: down(2)
IF-MIB::ifOperStatus.4 = INTEGER: down(2)
...
IP-MIB::icmpInMsgs = Counter32: 8
IP-MIB::icmpInErrors = Counter32: 0
IP-MIB::icmpInDestUnreachs = Counter32: 0
IP-MIB::icmpInTimeExcds = Counter32: 0

Код: Выделить всё

#!/bin/bash
# Time between checks in seconds
SLEEPTIME=10

#IP Address or domain name to ping. The script relies on the domain being 
#pingable and always available
TESTIP=www.yahoo.com

#Ping timeout in seconds
TIMEOUT=2

# External interfaces
EXTIF1=eth1
EXTIF2=eth2

#IP address of external interfaces. This is not the gateway address.
IP1=82.162.244.**
IP2=93.88.15.***

#Gateway IP addresses. This is the first (hop) gateway, could be your router IP 
#address if it has been configured as the gateway
GW1=82.162.244.**
GW2=93.88.15.***

# Relative weights of routes. Keep this to a low integer value. I am using 4
# for TATA connection because it is 4 times faster
W1=8
W2=1

# Broadband providers name; use your own names here.
NAME1=DSV
NAME2=NTC

#No of repeats of success or failure before changing status of connection
SUCCESSREPEATCOUNT=4
FAILUREREPEATCOUNT=1

# Do not change anything below this line

# Last link status indicates the macro status of the link we determined. This is down initially to force routing change upfront. Don't change these values.
LLS1=1
LLS2=1

# Last ping status. Don't change these values.
LPS1=1
LPS2=1

# Current ping status. Don't change these values.
CPS1=1
CPS2=1

# Change link status indicates that the link needs to be changed. Don't change these values.
CLS1=1
CLS2=1

# Count of repeated up status or down status. Don't change these values.
COUNT1=0
COUNT2=0

while : ; do
        ping -W $TIMEOUT -I $IP1 -c 1 $TESTIP > /dev/null  2>&1
        RETVAL=$?

        if [ $RETVAL -ne 0 ]; then
		echo $NAME1 Down
		CPS1=1
        else
		CPS1=0
        fi

	if [ $LPS1 -ne $CPS1 ]; then
		echo Ping status changed for $NAME1 from $LPS1 to $CPS1
		COUNT1=1
	else
		if [ $LPS1 -ne $LLS1 ]; then
			COUNT1=`expr $COUNT1 + 1`
		fi
	fi

        if [[ $COUNT1 -ge $SUCCESSREPEATCOUNT || ($LLS1 -eq 0 && $COUNT1 -ge $FAILUREREPEATCOUNT) ]]; then
		echo Uptime status will be changed for $NAME1 from $LLS1
		CLS1=0
		COUNT1=0
		if [ $LLS1 -eq 1 ]; then
			LLS1=0
		else
			LLS1=1
		fi
	else 
		CLS1=1
        fi

	LPS1=$CPS1

	ping -W $TIMEOUT -I $IP2 -c 1 $TESTIP > /dev/null  2>&1
       	RETVAL=$?

	if [ $RETVAL -ne 0 ]; then
		echo $NAME2 Down
                CPS2=1
        else
                CPS2=0
        fi

        if [ $LPS2 -ne $CPS2 ]; then
		echo Ping status changed for $NAME2 from $LPS2 to $CPS2
                COUNT2=1
        else
                if [ $LPS2 -ne $LLS2 ]; then
                        COUNT2=`expr $COUNT2 + 1`
                fi
        fi

        if [[ $COUNT2 -ge $SUCCESSREPEATCOUNT || ($LLS2 -eq 0 && $COUNT2 -ge $FAILUREREPEATCOUNT) ]]; then
		echo Uptime status will be changed for $NAME2 from $LLS2
		CLS2=0
		COUNT2=0
                if [ $LLS2 -eq 1 ]; then
                        LLS2=0
                else
                        LLS2=1
                fi
	else
		CLS2=1
        fi

	LPS2=$CPS2

	if [[ $CLS1 -eq 0 || $CLS2 -eq 0 ]]; then
		if [[ $LLS1 -eq 1 && $LLS2 -eq 0 ]]; then 
			echo Switching to $NAME2
                        ip route replace default scope global via $GW2 dev $EXTIF2
		elif [[ $LLS1 -eq 0 && $LLS2 -eq 1 ]]; then
			echo Switching to $NAME1
                        ip route replace default scope global via $GW1 dev $EXTIF1
		elif [[ $LLS1 -eq 0 && $LLS2 -eq 0 ]]; then
			echo Restoring default load balancing
                        ip route replace default scope global nexthop via $GW1 dev $EXTIF1 weight $W1 nexthop via $GW2 dev $EXTIF2 weight $W2
		fi
	fi
        sleep $SLEEPTIME
done

Код: Выделить всё

ip route add 192.168.1.0/24 dev eth1 src 192.168.1.10 table bsnl
ip route add default via 192.168.1.1 table bsnl
ip route add 192.168.0.0/24 dev eth2 src 192.168.0.10 table tata
ip route add default via 192.168.0.1 table tata
ip rule add from 192.168.1.10 table bsnl
ip rule add from 192.168.0.10 table tata
ip route add default scope global nexthop via 192.168.1.1 dev eth1 weight 1 nexthop via 192.168.0.1 dev eth2 weight 4

IPTABLES -t nat -a POSTROUTING -s 192.168.1.0/24 eth1 -j MASQUERADE
IPTABLES -t nat -a POSTROUTING -s 192.168.1.0/24 eth2 -j MASQUERADE
nohup /usr/sbin/gwping &