Mailinglist Archive: opensuse (3031 mails)

["AleXX®" <AleXX@xxxxxxxx>]

On Feb 3, 2008 5:27 PM, James D. Parra <Jamesp@xxxxxxxxxxxxxxxx> wrote:
> Hello,
>
> I'd like to expand the pool of addresses DHCP hands out from,
> 192.168.2.0/255.255.255.0 to 192.168.0.0/255.255.255.0, however I am not
> sure how to do this correctly.
Hi James... if you write that you want to expand the address pool (now
192.168.2.0 mask 255.255.255.0 aka /24 on Cisco notation) to
192.168.0.0 mask 255.255.255.0 aka /24 again, there must be something
to understand better... because:

192.168.2.0/24 is a network of 253 Ip address, plus the network and
the broadcast address.
192.168.0.0/24 is a network of 253 Ip address, plus the network and
the broadcast address.

so you are not going to expand your pool but just moving it...

Reading your request of reservation for some ip addresses you need, I
assume that you want to change the ip address pool in.
192.168.0.0 mask 255.255.0.0 aka /16 that is a B class network,
capable of 65534 Ip address (that I assume are a bit too much for you,
right??)
Beside this, if you want a B class private address pool, you should
consider that it shoudn't be a 192.168.x.x network, because it's
reserved for C class only.

I quote from http://en.wikipedia.org/wiki/Network_class:
172.16.0.0 - 172.31.255.255 (172.16.0.0/12) Private IP addresses, RFC
1918, B Class.

This way you can declare for example the 172.16.0.0/23 (mask
255.255.254.0) that has twice IPs than a C class network (510 Ips,
with 172.16.0.0 as network address and 172.16.1.255 as broadcast
address)
or you can declare 172.16.0.0/22 (mask 255.255.252.0) that is 4 times
a C class network (1022 IPs, with 172.16.0.0 as network address and
172.16.3.255 as broadcast address)

This should better fit your needs and respects the RFC 1918
(http://tools.ietf.org/html/rfc1918)

Going trough the configuration of your dhcpd.conf file I would change in:

shared-network MY_DOMAIN {

      subnet 172.16.0.0 netmask 255.255.254.0 {
              default-lease-time 259200;
              option routers 172.16.0.1;
#assuming you will move there the router address....
              option subnet-mask 255.255.254.0;
              option broadcast-address 172.16.1.255;
              option domain-name "mydomain.com";
              option domain-name-servers 172.16.0.2;    # I assume
you will migrate the DNS, NTP and NetBios servers here
              option netbios-name-servers 172.16.0.2;    #
              option ntp-servers 172.16.0.2;                   #
              option time-offset -28800;
              }

I hope that this helps a bit!

P.S. If you don't want to make so much changes on your environment,
consider about adding another C Class to the already working one and
route it trough a router.
So you will be able to share the workstation on those two networks and
keep the existing evironment unchanged...

Cheers!
AleXX




> Also, I'd like to remove the ranges of
> 192.168.2.0, 192.168.3.0 & 192.168.23.0, from the DHCP pool so I can reserve
> these ranges for manual assignments.
>
> Currently my dhcpd.conf files has this;
>
> shared-network MY_DOMAIN {
>
>        subnet 192.168.2.0 netmask 255.255.255.0 {
>                default-lease-time 259200;
>                option routers 192.168.2.1;
>                option subnet-mask 255.255.255.0;
>                option broadcast-address 192.168.2.255;
>                option domain-name "mydomain.com";
>                option domain-name-servers 192.168.2.2;
>                option netbios-name-servers 192.168.2.2;
>                option ntp-servers 192.168.2.2;
>                option time-offset -28800;
>                range dynamic-bootp 192.168.2.62 192.168.2.66;
>                range dynamic-bootp 192.168.2.68 192.168.2.71;
>                range dynamic-bootp 192.168.2.73 192.168.2.107;
>                range dynamic-bootp 192.168.2.109 192.168.2.129;
>                range dynamic-bootp 192.168.2.131 192.168.2.133;
>                range dynamic-bootp 192.168.2.135 192.168.2.137;
>                range dynamic-bootp 192.168.2.139 192.168.2.153;
>                range dynamic-bootp 192.168.2.155 192.168.2.157;
>                range dynamic-bootp 192.168.2.159 192.168.2.175;
>                range dynamic-bootp 192.168.2.177 192.168.2.253;
>                }
>
> How can I properly expand the range?
>
> Thank you in advance,
>
> James
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--
AleXX(R) - Alessandro
ICQ: 17197836
MSN: AleXX-77@xxxxxxxxxx
Skype: AleXX-77



-- 
AleXX(R) - Alessandro
ICQ: 17197836
MSN: AleXX-77@xxxxxxxxxx
Skype: AleXX-77
-- 
To unsubscribe, e-mail: opensuse+unsubscribe@xxxxxxxxxxxx
For additional commands, e-mail: opensuse+help@xxxxxxxxxxxx