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Today's Topics:
1. Re: Same MAC - diffrent IP depending on the contex (class)?
(Robert Socha)
2. Latest lease entry not the one offered to the client
(Klemen Sladic)
3. Re: Same MAC - diffrent IP depending on the contex (class)?
(glenn.satch...@uniq.com.au)
4. Re: Same MAC - diffrent IP depending on the contex (class)?
(Robert Socha)
----------------------------------------------------------------------
Message: 1
Date: Thu, 13 Aug 2020 14:54:12 +0200
From: Robert Socha <so...@socha.it>
To: dhcp-users@lists.isc.org
Subject: Re: Same MAC - diffrent IP depending on the contex (class)?
Message-ID: <c3e3ddc3-32c8-2103-4a09-a6326099c...@socha.it>
Content-Type: text/plain; charset=utf-8; format=flowed
Hi,
I was unable to find solution for my problem, so I implemented it in
source code.
I added "match if" directive to host definition which allows me to do
something like this:
option client-architecture code 93 = unsigned integer 16;
class "is-netboot" {
match if exists client-architecture and (not (option
user-class="iPXE"));
}
host O000C29EF4070 {
hardware ethernet 00:0C:29:EF:40:70;
fixed-address 20.20.20.20;
option routers 10.10.10.10;
option subnet-mask 255.255.255.255;
}
host N000C29EF4070 {
match if "is-netboot";
hardware ethernet 00:0C:29:EF:40:70;
fixed-address 100.64.4.2;
option routers 100.64.4.1;
option subnet-mask 255.255.255.252;
}
I also added support for globbing for include directive:
include "/etc/dhcp/host/*.conf"
include "/etc/dhcp/host/*/*.conf"
to recursively include files from folder and subfolders.
Best regards
W dniu 07.08.2020 o?23:02, Robert Socha pisze:
> Hi,
>
> I wonder if it's possible to achieve this in ISC DHCP:
>
> - I have static hosts only (only known clients - no dynamic assignments)
> - I need to assign different addresses to host depending on if it's boot
> client (PXE or UEFI), or if it's OS (linux,windows,etc) DHCP client
> discover
> ?? ( I need that because we use RFC3021 or /32 route-able IP
> assignments to customer services and this addresses are not supported by
> UEFI firmware).
>
> So something like this (in pseudo config) or as idea:
>
>
> # arch-type? -> option 93
> if(if exists arch-type) {
> ????# Private/netboot subnet
> ????host N000c290e741d {
> ??????????? hardware ethernet 00:0c:29:0e:74:1d;
> ??????????? fixed-address 100.120.120.2;
> ??????????? option routers 100.120.120.1;
> ??????????? option subnet-mask 255.255.255.252;
> ????}
> } else {
> ????# This for "public" network - discovers from "not boot agent"
> ????host O000c290e741d? {
> ??????????? hardware ethernet 00:0c:29:0e:74:1d;
> ??????????? fixed-address 10.255.255.11;
> ??????????? option routers 10.255.255.10;
> ??????????? if option vendor-class-identifier="MSFT 5.0" {
> ??????????????????? option subnet-mask 255.255.255.255;
> ??????????? } else {
> ??????????????????? option subnet-mask 255.255.255.254;
> ??????????? }
> ????}
> }
>
> I looking for solution with static assignments (not dynamic pool's) for
> netboot network (we some logic behind this assigned IP's)
>
> Best regards
--
Robert Socha
------------------------------
Message: 2
Date: Fri, 14 Aug 2020 10:39:29 +1200
From: Klemen Sladic <gostur...@gmail.com>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Latest lease entry not the one offered to the client
Message-ID:
<CAN6eUaH+xE+=_D36GG7VNbnOJ1kVXbk+zr4+aM7qkQz=GG=p...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Hi.
I did not manage to find any related discussion, so I'd like to ask this:
Using ISC DHCP 4.3.5 server and client.
DHCP server has these two entries in its dhcpd.leases (first lease at line
106, second at line 205):
lease 1.1.1.17 {
starts 4 2020/08/13 00:40:24;
ends 0 2020/08/23 00:40:24;
tstp 0 2020/08/23 00:40:24;
cltt 4 2020/08/13 00:40:24;
binding state active;
next binding state free;
rewind binding state free;
hardware ethernet 00:0d:ca:00:0f:dd;
set lease_mac = "0:d:ca:0:f:dd";
}
lease 1.1.1.28 {
starts 4 2020/08/13 03:03:13;
ends 0 2020/08/23 03:03:13;
tstp 0 2020/08/23 03:03:13;
cltt 4 2020/08/13 03:03:13;
binding state active;
next binding state free;
rewind binding state free;
hardware ethernet 00:0d:ca:00:0f:dd;
set lease_mac = "0:d:ca:0:f:dd";
}
This made me think that 1.1.1.28 is the newest lease and should be the
valid one for the client.
But if I do renew on the client it is being offered 1.1.1.17 (timestamps
are in different zone, port is custom):
Aug 13 21:10:39 (none) daemon.info
<https://slack-redir.net/link?url=http%3A%2F%2Fdaemon.info&v=3> dhclient:
DHCPREQUEST on eth0 to 255.255.255.255 port 17787
Aug 13 21:10:39 (none) daemon.info
<https://slack-redir.net/link?url=http%3A%2F%2Fdaemon.info&v=3> dhclient:
DHCPACK from 1.1.1.1
Aug 13 21:10:41 (none) daemon.info
<https://slack-redir.net/link?url=http%3A%2F%2Fdaemon.info&v=3> dhclient:
bound to 1.1.1.17 -- renewal in 392208 seconds.
Since some of my applications rely on knowing valid DHCP client IPs, this
is a problem.
I'd like to ask if that is a known issue or there may be something related
to my network or DHCP config?
Am I misinterpreting the dhcpd.leases file? I thought DHCP server appends
most recent leases at the end?
Thank you very much any help is much appreciated.
RegK
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------------------------------
Message: 3
Date: Fri, 14 Aug 2020 12:09:03 +1000
From: glenn.satch...@uniq.com.au
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: Same MAC - diffrent IP depending on the contex (class)?
Message-ID: <562d7634b2b7fd8380f92c6ce4382...@uniq.com.au>
Content-Type: text/plain; charset=UTF-8; format=flowed
Hi Robert,
That's one way to do it.
The other way would be to create a class and two pools for each host. In
the pools have a single IP address in the range. The class would select
based on PXE and ethernet. This would be ok for a few clients, but if
you have hundreds it might not scale well.
regards,
-glenn
On 2020-08-13 22:54, Robert Socha wrote:
> Hi,
>
> I was unable to find solution for my problem, so I implemented it in
> source code.
> I added "match if" directive to host definition which allows me to do
> something like this:
>
> option client-architecture code 93 = unsigned integer 16;
>
> class "is-netboot" {
> match if exists client-architecture and (not (option
> user-class="iPXE"));
> }
>
>
> host O000C29EF4070 {
> hardware ethernet 00:0C:29:EF:40:70;
> fixed-address 20.20.20.20;
> option routers 10.10.10.10;
> option subnet-mask 255.255.255.255;
> }
>
> host N000C29EF4070 {
> match if "is-netboot";
> hardware ethernet 00:0C:29:EF:40:70;
> fixed-address 100.64.4.2;
> option routers 100.64.4.1;
> option subnet-mask 255.255.255.252;
> }
>
> I also added support for globbing for include directive:
>
> include "/etc/dhcp/host/*.conf"
> include "/etc/dhcp/host/*/*.conf"
>
> to recursively include files from folder and subfolders.
>
> Best regards
>
>
> W dniu 07.08.2020 o?23:02, Robert Socha pisze:
>> Hi,
>>
>> I wonder if it's possible to achieve this in ISC DHCP:
>>
>> - I have static hosts only (only known clients - no dynamic
>> assignments)
>> - I need to assign different addresses to host depending on if it's
>> boot client (PXE or UEFI), or if it's OS (linux,windows,etc) DHCP
>> client discover
>> ?? ( I need that because we use RFC3021 or /32 route-able IP
>> assignments to customer services and this addresses are not supported
>> by UEFI firmware).
>>
>> So something like this (in pseudo config) or as idea:
>>
>>
>> # arch-type? -> option 93
>> if(if exists arch-type) {
>> ????# Private/netboot subnet
>> ????host N000c290e741d {
>> ??????????? hardware ethernet 00:0c:29:0e:74:1d;
>> ??????????? fixed-address 100.120.120.2;
>> ??????????? option routers 100.120.120.1;
>> ??????????? option subnet-mask 255.255.255.252;
>> ????}
>> } else {
>> ????# This for "public" network - discovers from "not boot agent"
>> ????host O000c290e741d? {
>> ??????????? hardware ethernet 00:0c:29:0e:74:1d;
>> ??????????? fixed-address 10.255.255.11;
>> ??????????? option routers 10.255.255.10;
>> ??????????? if option vendor-class-identifier="MSFT 5.0" {
>> ??????????????????? option subnet-mask 255.255.255.255;
>> ??????????? } else {
>> ??????????????????? option subnet-mask 255.255.255.254;
>> ??????????? }
>> ????}
>> }
>>
>> I looking for solution with static assignments (not dynamic pool's)
>> for netboot network (we some logic behind this assigned IP's)
>>
>> Best regards
------------------------------
Message: 4
Date: Fri, 14 Aug 2020 09:59:51 +0200
From: Robert Socha <so...@socha.it>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: Same MAC - diffrent IP depending on the contex (class)?
Message-ID: <6601d01c-a5bb-aab0-3ae4-25d6f1ffe...@socha.it>
Content-Type: text/plain; charset=utf-8; format=flowed
Hi,
Thank you :)
But:
>>> I looking for solution with static assignments (not dynamic pool's)
>>> for netboot network (we some logic behind this assigned IP's)
With my patch DHCP is stateless (so I can use HA via load balancer).
Best regards
W dniu 14.08.2020 o?04:09, glenn.satch...@uniq.com.au pisze:
> Hi Robert,
>
> That's one way to do it.
>
> The other way would be to create a class and two pools for each host. In
> the pools have a single IP address in the range. The class would select
> based on PXE and ethernet. This would be ok for a few clients, but if
> you have hundreds it might not scale well.
>
> regards,
> -glenn
>
> On 2020-08-13 22:54, Robert Socha wrote:
>> Hi,
>>
>> I was unable to find solution for my problem, so I implemented it in
>> source code.
>> I added "match if" directive to host definition which allows me to do
>> something like this:
>>
>> option client-architecture code 93 = unsigned integer 16;
>>
>> class "is-netboot" {
>> ??????? match if exists client-architecture and (not (option
>> user-class="iPXE"));
>> }
>>
>>
>> host O000C29EF4070 {
>> ?? hardware ethernet 00:0C:29:EF:40:70;
>> ?? fixed-address 20.20.20.20;
>> ?? option routers 10.10.10.10;
>> ?? option subnet-mask 255.255.255.255;
>> }
>>
>> host N000C29EF4070 {
>> ?? match if "is-netboot";
>> ?? hardware ethernet 00:0C:29:EF:40:70;
>> ?? fixed-address 100.64.4.2;
>> ?? option routers 100.64.4.1;
>> ?? option subnet-mask 255.255.255.252;
>> }
>>
>> I also added support for globbing for include directive:
>>
>> include "/etc/dhcp/host/*.conf"
>> include "/etc/dhcp/host/*/*.conf"
>>
>> to recursively include files from folder and subfolders.
>>
>> Best regards
>>
>>
>> W dniu 07.08.2020 o?23:02, Robert Socha pisze:
>>> Hi,
>>>
>>> I wonder if it's possible to achieve this in ISC DHCP:
>>>
>>> - I have static hosts only (only known clients - no dynamic assignments)
>>> - I need to assign different addresses to host depending on if it's
>>> boot client (PXE or UEFI), or if it's OS (linux,windows,etc) DHCP
>>> client discover
>>> ??? ( I need that because we use RFC3021 or /32 route-able IP
>>> assignments to customer services and this addresses are not supported
>>> by UEFI firmware).
>>>
>>> So something like this (in pseudo config) or as idea:
>>>
>>>
>>> # arch-type? -> option 93
>>> if(if exists arch-type) {
>>> ?????# Private/netboot subnet
>>> ?????host N000c290e741d {
>>> ???????????? hardware ethernet 00:0c:29:0e:74:1d;
>>> ???????????? fixed-address 100.120.120.2;
>>> ???????????? option routers 100.120.120.1;
>>> ???????????? option subnet-mask 255.255.255.252;
>>> ?????}
>>> } else {
>>> ?????# This for "public" network - discovers from "not boot agent"
>>> ?????host O000c290e741d? {
>>> ???????????? hardware ethernet 00:0c:29:0e:74:1d;
>>> ???????????? fixed-address 10.255.255.11;
>>> ???????????? option routers 10.255.255.10;
>>> ???????????? if option vendor-class-identifier="MSFT 5.0" {
>>> ???????????????????? option subnet-mask 255.255.255.255;
>>> ???????????? } else {
>>> ???????????????????? option subnet-mask 255.255.255.254;
>>> ???????????? }
>>> ?????}
>>> }
>>>
>>> I looking for solution with static assignments (not dynamic pool's)
>>> for netboot network (we some logic behind this assigned IP's)
>>>
>>> Best regards
> _______________________________________________
> ISC funds the development of this software with paid support
> subscriptions. Contact us at https://www.isc.org/contact/ for more
> information.
>
> dhcp-users mailing list
> dhcp-users@lists.isc.org
> https://lists.isc.org/mailman/listinfo/dhcp-users
--
Robert Socha
------------------------------
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