Re: 2 ISP connection sharing problem

Linux Advanced Routing and Traffic Control

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Arman,

 : I have divided my network into 2 parts now that is 
 : 193.168.3.127/25 and 192.168.3.128/25.

According to this output, below, you have not divided your /24 into 
two different networks, and it's really not clear exactly what you 
are asking.  Neither of these show up in your routing table:

  192.168.3.0/25  (netmask 255.255.255.128)
  192.168.3.128/25  (netmask 255.255.255.128)

 : Destination     Gateway         Genmask         Flags Metric Ref    Use
 : Iface
 : 192.168.3.0     *               255.255.255.0   U     0      0        0 eth0
 : 203.81.213.0    *               255.255.255.0   U     0      0        0 eth2
 : 192.168.1.0     *               255.255.255.0   U     0      0        0 eth1
 : 169.254.0.0     *               255.255.0.0     U     0      0        0 eth2
 : default         203.81.213.1    0.0.0.0         UG    0      0        0 eth2

 : I want to route part1 to ISP1 and Part 2 to ISP2.

Without further data ("ip rule show", "ip route show table $ALT") we 
cannot know which interface your ISP2 is reachable through.

 : I have made changes into rules. But I think my Tables T1,T2 are 
 : not used and default table is in use. How can I command to use 
 : tables T1,T2 instead of default table. route command output is

There are a number of resources you might wish to examine first.  I 
would recommend first understanding the RPDB lookup mechanism [0] 
and then following the steps for multiple uplinks in the (venerable) 
LARTC documentation [1].

You may find it fruitful to simulate the route lookup on a 
packet by packet basis by learning how to use the "ip route get" 
command:

  # ip route get iif eth4 70.14.115.3 from XX.YY.204.58
  70.14.115.3 from XX.YY.204.58 via XX.YY.204.1 dev eth8  src 192.168.4.1 
      cache <src-direct>  mtu 1500 advmss 1460 metric10 64 iif eth4
  # ip route get iif eth3 70.14.115.3 from 192.168.3.117
  70.14.115.3 from 192.168.3.117 via XX.YY.204.1 dev eth7  src 192.168.3.1 
      cache <src-direct>  mtu 1500 advmss 1460 metric10 64 iif eth3

Good luck,

- -Martin

 [0] http://linux-ip.net/html/routing-selection.html
     http://linux-ip.net/html/routing-selection.html#routing-selection-adv
 [1] http://lartc.org/howto/lartc.rpdb.multiple-links.html

- -- 
Martin A. Brown
http://linux-ip.net/
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