Re: multigateway routing with adsl and dynamic ip

[sonu chouhan <hi100nu@xxxxxxxxx>]

Thanks ben & Grant,

i am not so much expert in linux and don't have a proper knowledge of script writing, i am showing my problem again in detail below.

i am using 4 adsl lines of an same isp, my adsl modem is working as a nat router so i can get static private ip on my linux multigateway router, all is working fine

but my adsl router's wan port hang sometime in 4 to 5 days, and my linux router don't find that one line is down bcoz gateway is still up (i.e. adsl modem's lan port is working). i have try many different modem of different make but problem is same and when i use adsl modem as a bridge, there is no problem in modem, so i have desided to

change my adsl modem in bridge mode, but my isp only provide dynamic ip and also getting many problem which i am showing you below with my rules which is working fine

IFI=eth1 # local lan card

IPI=172.16.1.1 # local network's ip

NMI=16 # local network's subnet

IFE1=eth0 # adsl internet lan card

IFE2=eth2 # adsl internet lan card

IFE3=eth3 # adsl internet lan card

IFE4=eth4 # adsl internet lan card

IPE1=192.168.1.2 # adsl internet ip

IPE2=10.10.10.2 # adsl internet ip

IPE3=10.10.16.2 # adsl internet ip

IPE4=10.10.1.2 # adsl internet ip

NWE1=192.168.1.0

NWE2=10.10.10.0

NWE3=10.10.16.0

NWE4=10.10.1.0

NME1=24

NME2=24

NME3=24

NME4=24

BRD1=192.168.1.255

BRD2=10.10.10.255

BRD3=10.10.16.255

BRD4=10.10.1.255

GWE1=192.168.1.1

GWE2=10.10.10.1

GWE3=10.10.16.1

GWE4=10.10.1.1

/sbin/ip addr flush dev lo

/sbin/ip addr flush dev $IFI

/sbin/ip addr flush dev $IFE1

/sbin/ip addr flush dev $IFE2

/sbin/ip addr flush dev $IFE3

/sbin/ip addr flush dev $IFE4

/sbin/ip link set lo up

/sbin/ip addr add 127.0.0.1/8 brd + dev lo

/sbin/ip link set $IFI up

/sbin/ip addr add $IPI/$NMI brd + dev $IFI

/sbin/ip rule add prio 50 table main

/sbin/ip route del default table main

/sbin/ip link set $IFE1 up

/sbin/ip addr flush dev $IFE1

/sbin/ip addr add $IPE1/$NME1 brd $BRD1 dev $IFE1

/sbin/ip link set $IFE2 up

/sbin/ip addr flush dev $IFE2

/sbin/ip addr add $IPE2/$NME2 brd $BRD2 dev $IFE2

/sbin/ip link set $IFE3 up

/sbin/ip addr flush dev $IFE3

/sbin/ip addr add $IPE3/$NME3 brd $BRD3 dev $IFE3

/sbin/ip link set $IFE4 up

/sbin/ip addr flush dev $IFE4

/sbin/ip addr add $IPE4/$NME4 brd $BRD4 dev $IFE4

/sbin/ip rule add prio 201 from $NWE1/$NME1 table T1 # problem 1 : how to know the subnet each time ip change

/sbin/ip route add default via $GWE1 dev $IFE1 src $IPE1 proto static table T1 # problem 2 : how to add gw, it's already added. Problem 3 : how to know IPE, it's dynamic

/sbin/ip route append prohibit default table T1 metric 1 proto static

/sbin/ip rule add prio 202 from $NWE2/$NME2 table T2

/sbin/ip route add default via $GWE2 dev $IFE2 src $IPE2 proto static table T2

/sbin/ip route append prohibit default table T2 metric 1 proto static

/sbin/ip rule add prio 203 from $NWE3/$NME3 table T3

/sbin/ip route add default via $GWE3 dev $IFE3 src $IPE3 proto static table T3

/sbin/ip route append prohibit default table T3

/sbin/ip rule add prio 204 from $NWE4/$NME4 table T4

/sbin/ip route add default via $GWE4 dev $IFE4 src $IPE4 proto static table T4

/sbin/ip route append prohibit default table T4

/sbin/ip rule add prio 222 table T6

/sbin/ip route add default table T6 proto static nexthop via $GWE4 dev $IFE4 weight 1 nexthop via $GWE3 dev $IFE3 weight 1 nexthop via $GWE2 dev $IFE2 weight 1 nexthop via $GWE1 dev $IFE1 weight 1

/sbin/ip rule add fwmark 0x11 table T1

/sbin/ip rule add fwmark 0x12 table T2

/sbin/ip rule add fwmark 0x13 table T3

/sbin/ip rule add fwmark 0x14 table T4

/sbin/ip route flush cache

so plz help me out that how can i make a script, and i don't want to run any script manuly bcoz ip does change in every few hours

sorry for my poor english

thanks in advance.

Nilesh..........

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