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Today's Topics:
1. Re: dns setting for client (Simon Hobson)
2. Re: strange behavior of shared network (Sten Carlsen)
3. Re: strange behavior of shared network (Simon Hobson)
4. Re: strange behavior of shared network (Sten Carlsen)
----------------------------------------------------------------------
Message: 1
Date: Fri, 04 Oct 2019 13:29:48 +0100
From: Simon Hobson <dh...@thehobsons.co.uk>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: dns setting for client
Message-ID: <53e14fde-0110-4a0d-a0a7-453b6b251...@thehobsons.co.uk>
Content-Type: text/plain; charset=utf-8
Julie Xu <j...@westernsydney.edu.au> wrote:
>We have changed DNS server, and on dhcpd.conf I did change the dns to
>new server, but, on the client site, if you do ipconfig/all, you can
>see the dns is still pointed older dns server, if there is possible to
>on dhcpd.conf to force dns server change?
As soon as you have updated the server, it will start serving the new
information. However, it's a pull transfer and relies on the client to ask for
it. By the end of your max-lease-time setting, you can guarantee that there are
no active leases that we're given with the old settings.
However, I vaguely recall some discussion in the past related to clients that
didn't update settings when renewing an active lease. I don't know whether your
clients fall into that group.
As already said, manually releasing and then renewing the lease at the client
end should do it. Or just wait...
A brute force method would be to change your IP range and force clients to get
a new lease. Add a new range, set the old one to "deny booting", and then tne
server will Nack any renewal requests for the old addresses. This will break
all existing connections.
------------------------------
Message: 2
Date: Fri, 4 Oct 2019 16:18:59 +0200
From: Sten Carlsen <st...@s-carlsen.dk>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: strange behavior of shared network
Message-ID: <e1fd3729-552f-4300-a344-6cf846e02...@s-carlsen.dk>
Content-Type: text/plain; charset="utf-8"
--
Best regards
Sten Carlsen
"No trees were killed in the making of this e-mail... however,
a large number of electrons were terribly inconvenienced."
> On 4 Oct 2019, at 13.04, Milan Kovac <kova...@gmail.com> wrote:
>
> I think I found the problem.
>
> There can not be defined range in subnet which is for static clients.
Well, no.
My shared network has:
192.168.16.0/24 - one single network segment
192.168.16.1 - 192.168.16.30 - static and fixed allocations
192.168.16.31 - 192.168.16.49 - static allocations
192.168.16.50 - 192.168.16.150 - class based allocation - NO router given, no
internet access
192.168.16.160 - 192.168.16.195 - class based allocation - router given
192.168.16.200 - 192.168.16.254 - static and fixed allocations
192.168.161.0/24 - for unknown clients until they get a fixed address or are
put into a class
192.168.161.100 - 192.168.161.150 - only unknown clients
This works fine.
Looking at the data you give, I see no conflict. Can you be more specific about
the problem?
>
> I will test it more deeply and will give results.
>
> In any case, thanks a lot for ideas.
>
> Milan
>
> D?a 2. 10. 2019 o 21:50 Simon Hobson nap?sal(a):
>> Milan Kovac <kova...@gmail.com> wrote:
>>
>>> I have a few routed networks each with 2 subnets ( public and private )
>> ...
>>
>>
>>> Here is dhcpd.conf
>> ...
>>> shared-network 001 {
>>> default-lease-time 43200;
>>> max-lease-time 43200;
>>> # divina-private
>>> subnet 10.64.0.0 netmask 255.255.240.0 {
>>> option broadcast-address 10.64.15.255;
>>> option subnet-mask 255.255.240.0;
>>> option routers 10.64.0.1;
>>> range 10.64.0.2 10.64.15.254;
>>> }
>>>
>>> # divina-public
>>> subnet 157.157.56.128 netmask 255.255.255.240 {
>>> option broadcast-address 157.157.56.143;
>>> option subnet-mask 255.255.255.240;
>>> option routers 157.157.56.129;
>>> deny unknown-clients;
>>> range 157.157.56.130 157.157.56.142;
>>> host Divinka-Uhliarik {
>>> hardware ethernet cc:2d:e0:3f:fa:42;
>>> fixed-address 157.157.56.130;
>>> }
>>> host Divinka-Obecny-Urad {
>>> hardware ethernet 00:4f:74:31:b4:03;
>>> fixed-address 157.157.56.131;
>>> }
>>> }
>>> }
>> You need to fix this to start with.
>> Host statements must always be defined in the global scope - they cannot be
>> defined in a lower scope as you have done here. Wherever you define them,
>> they are always global in scope - but they can inherit options from where
>> there are defined. This is almost certainly not what you want.
>>
>> So I suggest you fix this first and if the problem persists, then we can try
>> and diagnose it.
>>
>> _______________________________________________
>> dhcp-users mailing list
>> dhcp-users@lists.isc.org
>> https://lists.isc.org/mailman/listinfo/dhcp-users
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Message: 3
Date: Fri, 4 Oct 2019 20:42:04 +0100
From: Simon Hobson <dh...@thehobsons.co.uk>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: strange behavior of shared network
Message-ID: <adf0555a-2b8a-4db7-bf9e-d2152c0b9...@thehobsons.co.uk>
Content-Type: text/plain; charset=us-ascii
Sten Carlsen <st...@s-carlsen.dk> wrote:
> Looking at the data you give, I see no conflict. Can you be more specific
> about the problem?
You can't see it when it's been pointed out ?
>>>> subnet 157.157.56.128 netmask 255.255.255.240 {
>>>> option broadcast-address 157.157.56.143;
>>>> option subnet-mask 255.255.255.240;
>>>> option routers 157.157.56.129;
>>>> deny unknown-clients;
>>>> range 157.157.56.130 157.157.56.142;
^^^^^^^^^^^^^^
>>>> host Divinka-Uhliarik {
>>>> hardware ethernet cc:2d:e0:3f:fa:42;
>>>> fixed-address 157.157.56.130;
^^^^^^^^^^^^^^
>>>> }
>>>> host Divinka-Obecny-Urad {
>>>> hardware ethernet 00:4f:74:31:b4:03;
>>>> fixed-address 157.157.56.131;
^^^^^^^^^^^^^^
Hosts with fixed addresses that are within a dynamic range. Recipe for problems.
------------------------------
Message: 4
Date: Sat, 5 Oct 2019 02:49:46 +0200
From: Sten Carlsen <st...@s-carlsen.dk>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: strange behavior of shared network
Message-ID: <4c67d8fe-dd5e-4bca-857e-7627ba03e...@s-carlsen.dk>
Content-Type: text/plain; charset=us-ascii
--
Best regards
Sten Carlsen
No improvements come from shouting:
"MALE BOVINE MANURE!!!"
> On 4 Oct 2019, at 21.42, Simon Hobson <dh...@thehobsons.co.uk> wrote:
>
> Sten Carlsen <st...@s-carlsen.dk> wrote:
>
>> Looking at the data you give, I see no conflict. Can you be more specific
>> about the problem?
>
> You can't see it when it's been pointed out ?
Right, simple. Lost in detail. My fault.
>
>>>>> subnet 157.157.56.128 netmask 255.255.255.240 {
>>>>> option broadcast-address 157.157.56.143;
>>>>> option subnet-mask 255.255.255.240;
>>>>> option routers 157.157.56.129;
>>>>> deny unknown-clients;
>>>>> range 157.157.56.130 157.157.56.142;
> ^^^^^^^^^^^^^^
>>>>> host Divinka-Uhliarik {
>>>>> hardware ethernet cc:2d:e0:3f:fa:42;
>>>>> fixed-address 157.157.56.130;
> ^^^^^^^^^^^^^^
>>>>> }
>>>>> host Divinka-Obecny-Urad {
>>>>> hardware ethernet 00:4f:74:31:b4:03;
>>>>> fixed-address 157.157.56.131;
> ^^^^^^^^^^^^^^
>
> Hosts with fixed addresses that are within a dynamic range. Recipe for
> problems.
>
> _______________________________________________
> dhcp-users mailing list
> dhcp-users@lists.isc.org
> https://lists.isc.org/mailman/listinfo/dhcp-users
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