dhcpd assigns ip addresses backwards

qartis · 07-28-2005, 04:34 AM

Hey, I've got a slackware-current router, which uses ISC dhcpd v3.0.1. Our network uses 192.168.1.1 -> 192.168.1.254, so in dhcpd.conf I set

Code:

range 192.168.1.10 192.168.1.100;

It works, but it assigns 192.168.1.100, then 99, then 98, etc. I reserved 2-10 for some permanent computers, and that works. I've tried messing with the range, for example

Code:

range 192.168.1.2 192.168.1.254;
    and
range 192.168.1.254 192.168.1.2;

It always hands out the ip addresses from biggest to smallest... Here's my full dhcpd.conf:

Code:

ddns-update-style ad-hoc;
authoritative;
subnet 192.168.1.0 netmask 255.255.255.0 {
        option routers 192.168.1.1;
        option broadcast-address 192.168.1.255;
        option subnet-mask 255.255.255.0;
        option domain-name-servers 192.168.1.1;
        range 192.168.1.10 192.168.1.100;

        default-lease-time 21600;
        max-lease-time 43200;
        #snip
}

Has anyone ever seen this?

demian · 07-29-2005, 12:52 PM

Yup, seen it. Normal behaviour for a newly installed ISC dhcpd v3.

Palula · 08-07-2005, 05:23 PM

Well I´m intrested in getting my IP´s in order (from smallest to biggest).
My network is configured to be 192.168.100.1 (dhcp server) and the rest of the numbers until 254 should be assigned normally. The thing is that it assigned the number 192.168.100.254, when would like it better to assign 192.168.100.2. :-)

Is there a way to make it assign Ip´s in that order?

demian · 08-07-2005, 06:44 PM

Quote:

[i]Is there a way to make it assign Ip´s in that order? [/B]

No.

If you want a certain IP address have the dhcp server asign it by MAC address or use static IPs.

ComputerErik · 08-07-2005, 07:58 PM

Why is it any better or worse for the computer to have the lower IP address? Since you are using DHCP I would guess that you never really access these hosts via IP address. I never really cared which way the DHCP server assigns addresses, as long as it doesn't double up.

Palula · 08-08-2005, 06:59 AM

So is there a way for me to reset all leases. For example I use to have one computer assigned to a specific IP number (192.168.100.3). But now I´d like to have them in the order that the DHCP assigns. I don´t want to have, for example:

Server - 192.168.100.1
Client 1 - 192.168.100.254
Client 2 - 192.168.100.3

I would prefer:

Server - 192.168.100.1
Client 1 - 192.168.100.254
Client 2 - 192.168.100.253

So the question is: How do I clear all lease configs? Because the client 2 is always getting that IP (192.168.100.3). Just for the record: In the dhcpd.conf, I haven´t made any assignment by MAC.

Thanks