many many thanks for ur help
  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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