DHCP Problum

mail2mphani · 03-24-2009, 06:41 AM

hi to all

i am using RHEL5

i have a small network of 200 system

so i want to setup dhcp server. with 2 sub nets

i server have 2 nics.

eth0 ip=192.168.147.10(for internet)
eth1 ip=192.168.10.254
eth1:1 ip=192.168.20.254

my configa ration file is like given below

Quote:

ddns-update-style interim;
ignore client-updates;

subnet 192.168.10.0 netmask 255.255.255.0 {

# --- default gateway
option routers 192.168.10.254;
option subnet-mask 255.255.255.0;

option domain-name "example.com";
option domain-name-servers 192.168.10.254;

option time-offset -18000; # Eastern Standard Time
# --- Selects point-to-point node (default is hybrid). Don't change this unless
# -- you understand Netbios very well
# option netbios-node-type 2;

range dynamic-bootp 192.168.10.120 192.168.10.140;
default-lease-time 21600;
max-lease-time 43200;
}
shared-network two-subnets{
option routers 192.168.10.254;
option subnet-mask 255.255.255.0;
option domain-name "example.com";
option domain-name-servers 192.168.10.254;
default-lease-time 21600;
max-lease-time 43200;
}
subnet 192.168.20.0 netmask 255.255.255.0 {
range dynamic-bootp 192.168.20.120 192.168.20.140;
}

i am not understanding what to do

plz help me....

grizly · 03-24-2009, 06:53 AM

I don't think you need the "dynamic-bootp" part..

http://www.centos.org/docs/5/html/De...ng-server.html

Also, after reading some docs to refresh my memory: http://www.redhat.com/docs/manuals/e...tml#DYNAMIC-IP

It's because you have separated the subnets from the shared-network block.

mail2mphani · 03-24-2009, 07:31 AM

is this

Quote:

eth1:1 ip=192.168.20.254

needed or not.
the system is also DNS and proxy server.

is it required virtual ip ? or want another lan card/

any on plz explain clearly.

if i use only one network it is (DHCP server) working fine.

how can i split the network

grizly · 03-24-2009, 08:32 PM

You should be able to run with as many virtual interfaces as you like mate, another of your problems is that your ranges are too small..

200 systems you said, why are you only allocating 20 IP's on each subnet?

Try something like this:

Quote:

ddns-update-style interim;
ignore client-updates;

shared-network two-subnets{

option subnet-mask 255.255.255.0;
option domain-name "example.com";
option domain-name-servers 192.168.10.254;
default-lease-time 21600;
max-lease-time 43200;

subnet 192.168.20.0 netmask 255.255.255.0 {
option routers 192.168.20.254;
range 192.168.20.120 192.168.20.240;
}

subnet 192.168.10.0 netmask 255.255.255.0 {
option routers 192.168.10.254;
range 192.168.10.120 192.168.10.240;
}

}

Did you read the docs?

The problem will be of course, that you will have 2 DHCP servers running on one physical network.. so which will the clients connect to?

If you had another nic, you could physically segment it to prevent this.

mail2mphani · 03-25-2009, 05:15 AM

thank u for given solution .

now dhcp server is runnig on virtual ips.

thank you