Hi all,
I installed Redhat linux Enterprise Edition Advance Server 4 on intel GNTL borad, I successfully configured 3 SATA 400 GB on it with 3 1GB NIC, all NICs are configured at same network like this
192.100.100.1
192.100.100.2
192.100.100.3

Problem is that all NICs are not working at same time only one is functioning, is there any configuration mistake I done?

Basically I want to attached each network card to a seperate switch like this

192.100.100.1 to Switch 1
192.100.100.2 to Switch 2
192.100.100.3 to Switch 3

Remember switches are not inter-connected.

this just doesn't make any sense... you could bridge the interfaces to make yourself act as a switch in some respects but connecting to 3 isolated networks on the same subnet is nonsense.

@acid_kewpie Maybe he thinks that he can get so more performance?!?
I also don't get a clue out of this?
@icna Are these switches maybe prepared for VLAN?
(Problem is that all NICs are not working at same time only one is functioning, is there any configuration mistake I done?)
How do you mean that? Aren't the up?
Should each device listen on different service?

Yes, my thinging is to get more performance to Separate 3 NICs with 3 isolated swithces.

All 3 NICs are up/active and LEDs is also blinking when I connect network wire to each of them NICs. Problem I face is that when I try to reached this sytem (the server) through windows network with siwtch 1 its working but swithc 2 and switch 3 can not found server destination and raise error "Network path not found".

if these switches are isolated, then how do you benefit?? if they all are actaully interconnected, and NOT isolated, then yes you could look at using a bond on the three cards to increase your throughput. in a basic layer 2 switching enviornment without vlan's this will be limited. ideally you would have intelligent siwtches, e.g. Cisco Catalysts which can aggregate their ports into a bond too, so you would see muliple connetions as single entities at both ends. what you want won't really help you much though. it is possible to do outbound laod balancing, but inbound will still need to com einto a single nic per subnet.

Simply some one guide me that how I configure 3 Network cards on my system with different netmask and connect each network card to a isolated switch and memeber of each switch have access to the member of another switch.

different netmasks? what do you mean by that? if you have different netmasks then i'd assume that you actually mean completely different networks. in that case you are asking how to turn your linux pc in to a router. in that case just place each network card in its right place and enabling basic routing with "echo 1 > /proc/sys/net/ipv4/ip_forward" and it should start routing.

Its mean that I want to configure following settings

lan1 = 192.100.100.01
(connect to a switch having IPs from 192.100.100.02 to
192.100.100.17)

lan2 = 192.100.101.01
(connect to a switch having IPs from 192.100.101.02 to
192.100.101.17)

lan1 = 192.100.102.01
(connect to a switch having IPs from 192.100.102.02 to
192.100.102.17)


all network cards are configured on same linux machine,
and I want to interconnct switched b/w them

as above then.

then I can't get Success, tell me the method how I do in

i've already told you, please pay attention. you should only need to enable "echo 1 > /proc/sys/net/ipv4/ip_forward" and things should start working. if it doesn't please give USEFUL information back for help, "it don't work" is not useful.

/proc/sys/net/ipv4/ip_forward

this command gives me error Permission Denied

you arne't root then. or you're not running the command i gave you and instead just typing "/proc/sys/net/ipv4/ip_forward". if you want help, you need to provide much more feedback to us than you currently are...