Hi Arman,
If you want to route part1 to ISP1 and Part 2 to ISP2. You should have
the following rules
ip rule add from 193.168.3.0/25 to 0.0.0.0/0 table 100
ip route add default via 192.168.1.1 table 100
ip rule add from 192.168.3.128/25 to 0.0.0.0/0 table 200
ip route add default via 203.81.213.1 table 200
On 9/3/07, Martin A. Brown <martin@xxxxxxxxxxxx> wrote:
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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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--
"The network is the computer"
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