ok i m making my problem more clear...
my LAN ip is :172.16.100.0/24
ip of eth1 is :202.51.78.122 and this is fixed and permanent address
and it has no netmask and gateway(so, to provide internet to my LAN i have used the ppp0 for this connection )
ip of eth2 : 203.78.165.154; netmask:255.255.255.248; gateway:203.78.165.153
for eth0 my file is :/etc/sysconfig/network-scripts/ifcfg-eth0
for eth1 :/etc/sysconfig/network-scripts/ifcfg-eth1
for eth2:/etc/sysconfig/network-scripts/ifcfg-eth2
and my rules are placed in /etc/iproute2/rt_tables as suggested by lartc.org
and the whole copy of my above file is copied below:::>>>
#
# reserved values
#
#255 local
#254 main
#253 default
#0 unspec
#
# local
#
#1 inr.ruhep
#
# below this is added by me and above this is by default
# two addational routing tables
#ip route add 202.51.78.0/24 dev eth1 src ppp0 table T1
#ip route add default via ppp0 table T1
ip route add 203.78.165.0/24 dev eth2 src 203.78.165.154 table T2
ip route add default via 203.78.165.153 table T2
# main routing table
ip route add 202.51.78.0/24 dev eth1 src ppp0
ip route add 203.78.165.0/24 dev src 203.78.165.154
# preference for default route
ip route add default via 202.51.76.122
# routing rules
ip rule add from ppp0 table T1
ip rule add from 203.78.165.154 table T2
# entries for local network
ip route add 172.16.100.0/24 dev eth0 table T1
ip route add 203.78.165.0/24 dev eth2 table T1
ip route add 127.0.0.0/8 dev lo table T1
ip route add 172.16.100.0/24 dev eth0 table T2
ip route add 202.51.78.0/24 dev eth1 table T2
ip route add 127.0.0.0/8 dev lo table T2
#load balancing
ip route add default scope global nexthop via ppp0 dev eth1 weight 1 nexthop via 203.78.165.153 dev eth2 weight 1
this above one is the full and exact copy of my working....
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