[CentOS] Allocating 64 kbits/s out of 256 kbits/s for one LAN behing firewall

Thu Aug 2 09:18:15 UTC 2007
Indunil Jayasooriya <indunil75 at gmail.com>

Hi,

We have a 256 kbits/s (kilobits per second) link to the internet. it is a
router running Linux that belongs to our ISP.  They have given us 8 internet
ips. (i.e- subnet is 255.255.255.248). one has been given to this router. I
have given another internet ip to the firewall running CentOS 4.5. iptables
is running on it. And also, I have installed iproute2 pkg as well.

pls see below for installed pkgs.
[root at firebox ~]# rpm -qa |grep iptables
iptables-1.2.11-3.1.RHEL4
[root at firebox ~]# rpm -qa |grep iproute
iproute-2.6.9-3.EL4.3.centos4

This firewall has 3 ethernet cards at the moment. one is connected to
router. one is connected to our DMZ zone. one is connected to LAN1.

These are ips of the firewall.

eth0 (internet) - 1.2.3.4/255.255.255.248 (pls assume it. For security
reason, I will not give you the actual ip)
eth1 (DMZ Zone) - 192.168.100.254/255.255.255.0
eth2 (LAN1) - 192.168.101.254/255.255.255.0

Now, everyone in LAN1 has access to internet. (due to SNAT rule)

Now, I want to install another ethernet card to this firewall. then, it
would be eth3.

eth3 will be as follows.

eth3 (LAN2) - 192.168.102.254/255.255.255.0

Now, I want put about 5 people (5 PCs) behind this LAN2 and give internet
access to them. But, I do not want them to use my whole bandwidth (i.e - 256
kbit/s), But Instead, I want peple behind this LAN2 to allocate  64
kbits/s(kilo bits per second) for their
internert access.

Is it possible to acheive this task on firewall running iptables and
iproute2 (CentOS 4.5) ?

If so, How can I do such thing?

If I do such thing, what will happen to the people behind LAN1 ? Will they
get whole 256 kbits/s as before or will they get 256 kbit/s - 64  kbit/s for
their internet access?


Hope to hear form you.










-- 
Thank you
Indunil Jayasooriya
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