Okay gurus,
I've got four network cards.
one has the following:
IP : 192.168.0.100
subnet mask: 255.255.255.0
default gateway:192.168.0.1
DNS1: 25.44.125.137
DNS2: 25.45.245.79

the second has:
IP : 192.168.10.101
subnet mask: 255.255.255.0
default gateway:192.168.10.1
DNS1: 26.134.25.113
DNS2: 26.135.45.69

third has the following:
IP : 192.168.20.190
subnet mask: 255.255.255.0
default gateway:192.168.20.1
DNS1: 23.44.125.137
DNS2: 23.45.245.79

the forth has:
IP : 192.168.30.200
subnet mask: 255.255.255.0
default gateway:192.168.30.1
DNS1: 27.134.25.113
DNS2: 27.135.45.69

my problem is: given that the 4 NICs have different subnet, gateway and different DNS servers, how to achieve network load balancing or teaming, were all cards are used simultaneously. That is is there a internal router kernel module that will let me achieve that ...

Thanks

You are looking for bonding not bounding (I think).

I THINK that all the nics need to be on the same subnet in order to bond them.

For load balancing try the following links

Load Balance your traffic with a script for linux
10.4. Multiple Connections to the Internet

Are you trying to bond multiple connections to the internet(faster internet) or are you trying to bond so your lan server is faster?

Thank you ...
load balancing or load division if I may.
what I want to achieve is the following:
Let assume I am using firefox to browse, how can I configure my currently four network cards so that firefox can use them all simultaneously, i.e.: For a given http request, some packets are received via NIC-1, at the same time other packets received by NIC-2, and so on. USE ALL the NICs in PARALLEL.

And in case I am using ssh and firefox and say sftp at the same time, How I should configure the NICs, so not only to distribute the load between the NICs but also make them look as if a single NIC.
thank you

thank you tagno25, I found from the links what I want really.
http://www.ssi.bg/~ja/nano.txt

The issue it is not trivial! and if I understood well requires a dedicated Linux box to act as a router!
thanks

Have you tried to use ifenslave to bond them all together?