Well, this is my network http://www.financialexpress-bd.com/net.gif

I am not getting how should I manage all my clients from different network.
For example;

client-1 resides on x.x.x.0/27
client-2 resides on x.x.x.32/27
client-3 resides on x.x.x.64/27
client-4 resides on x.x.x.96/27


I must need them to use the bandwidth manager as their default gateway
to restrict them using a given amount of bandwidth. but I have only one
LAN interface on BW manager for inside network. How can i connect different client -
as because they are from different network?

I heard something called "IP-alias" but if I do so on my bw-manager's inside lan interface,
Will it be practical to put that link in a switch and mix up all client ???

I am really confused...

You can add multiple IPs to a single interface using IP aliasing, just as you heard. where X is the interface you want to use, n is the "alias" (an integer value) and z.z.z.z is the IP you want to assign.

Thanks for reply,

but my confusion is; suppose, I assign IP-alias on a NIC that means..the card can reply to each aliased IP network. But where should I place the Ethernet cable connected with the card ?

should I place the cable in a switch ? If so, IS this practical connecting different network in the same switch ? (You know my clients are from different network).

Main question is: I can alias different IP from different network on a perticular Lan card. but how should I connect different network to it physically ? I dont think i can use a switch...so whats the solution ?

If you feel you can't use a switch, then you'll need at least a configurable switch with VLAN support if not a full router.

Why are you using these separate networks, and why are you tying them all together?

Well, I am trying to do so, because my client use different service

client-1 resides on x.x.x.0/27 (voice)
client-2 resides on x.x.x.32/27 (Internet -www)
client-3 resides on x.x.x.64/27 (email)
client-4 resides on x.x.x.96/27 (ftp)

like this........

so, I wanted to seperat their network and assign different rule for bandwidth using and priority with QoS service on my Bandwidth Manager server. for this reason I need a way on my Bandwidth manger can listen to each network (I am gonna use Ip-alias for this purpose) but I just wanted to know how physically connect different network on one Lan card.

Yes, As you suggested..VLAN can solve to my problem. But is there any way out on linux server to solve it ? because I don't have any Catalyst on my office

Well, linux does have VLAN support, though I don't know how extensive it is. If you're not needing to keep them separate for security reasons, you can really just bring them all into a switch. The separate subnets should keep broadcast packets and the like apart.