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Today's Topics:
1. Re: Pool selection based on Giaddr (Simon Hobson)
2. RE: Pool selection based on Giaddr (Glenn Satchell)
----------------------------------------------------------------------
Message: 1
Date: Thu, 9 Jun 2016 17:16:40 +0100
From: Simon Hobson <dh...@thehobsons.co.uk>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: Pool selection based on Giaddr
Message-ID: <2df0eb0b-fd57-4659-a36e-9ee8df6b7...@thehobsons.co.uk>
Content-Type: text/plain; charset=us-ascii
Nisha Chandy <ncha...@hctc.coop> wrote:
> I was able to get this working.
>
> By
>
> class "Vlan451"
> {
> match if (binary-to-ascii(10,8, ".", packet(24,4)) ="10.80.2.44");
> }
You should not need that. This is pretty basic stuff that the server does
handle automagically - if set up right.
> shared-network "E451" {
> subnet 10.80.2.44 netmask 255.255.255.252 {
> pool {
> deny members of "Vlan451";
> range 10.80.2.45;
> deny dynamic bootp clients;
> }
> }
>
> subnet X.170.132.0 netmask 255.255.255.0 {
> #Vlan451
> pool
> {
> allow members of "Vlan451";
> range X.170.132.2 192.170.132.253;
> deny dynamic bootp clients;
> }
> }
> }
It might help if you clarified what you are expecting to happen.
> Jun 9 08:59:32 dhcpsvr1 dhcpd: DHCPDISCOVER from 00:06:31:b4:62:a8 via
> 10.80.2.44: network E451: no free leases
The obvious question here is, are there actually any free leases ?
Did you actually have a class Vlan451 defined ? For example, if class Vlan451
was not defined, then the second pool could never be used (the client can't be
a member of a pool if that pool is not defined). And if the address 10.80.2.45
was already leased out then that's not available for leasing.
So, my guess is that you want all clients behind that relay agent to be using
the pool 170.132.2-192.170.132.253, and nothing to use the address 10.80.2.45 ?
The simple way of doing this is simply to not define the "range 10.80.2.45",
leave out all references to Vlan451, and the server will automagically give
clients addresses from the 170.132.0 subnet (that's the purpose of the shared
network statement).
BTW - is 10.80.2.44 actually the address of an interface ? It's not valid for
interface use in the subnet.
------------------------------
Message: 2
Date: Fri, 10 Jun 2016 11:16:36 +1000
From: "Glenn Satchell" <glenn.satch...@uniq.com.au>
To: "Users of ISC DHCP" <dhcp-users@lists.isc.org>
Subject: RE: Pool selection based on Giaddr
Message-ID:
<52ce979a5cd61967e5cdf9f8c8c63567.squir...@mail.uniq.com.au>
Content-Type: text/plain;charset=iso-8859-1
Hi Nisha
Your subnet is not specified correctly, or rather your gateway address is
wrong for the subnet.
subnet 10.80.2.44 netmask 255.255.255.252
This network address is 10.80.2.44, broadcast is 10.80.2.47 and the two
usable IPs are 10.80.2.45 and 10.80.2.46.
The giaddr should be 10.80.2.46 if you want the other device to be
10.80.2.45. Then dhcpd will automatically match the incoming request to
the right subnet.
Check with an online subnet calculator such as
http://www.subnet-calculator.com
regards,
-glenn
On Fri, June 10, 2016 12:48 am, Nisha Chandy wrote:
> I was able to get this working.
>
> By
>
> class "Vlan451"
> {
> match if (binary-to-ascii(10,8,".",packet(24,4)) ="10.80.2.44");
> }
>
>
> Thanks & Regards,
> Nisha Chandy
> IP Network Engineer
>
> From: Nisha Chandy
> Sent: Thursday, June 09, 2016 9:02 AM
> To: 'dhcp-users@lists.isc.org' <dhcp-users@lists.isc.org>
> Subject: Pool selection based on Giaddr
>
>
> I am trying to identify how I can match on giaddr the ISC DHCP server and
> then determine which ip subnet the ISC DHCP server will hand out.
>
> client----->layer2-[switch]----->[vrf interent]router[vrf
> default]-------[isc]dhcp server
>
> Here is how I have my config. I keep getting no free leases. My giaddr
> that the request will come in is 10.80.2.44. Appreciate any help
>
>
> option space myagent;
> option agent.subscriber-id code 6 = text;
> option agent.link-selection code 5 = ip-address;
>
>
> shared-network "E451"
> {
> subnet 10.80.2.44 netmask 255.255.255.252 {
> pool
> {
> deny members of "Vlan451";
> range 10.80.2.45;
> deny dynamic bootp
> clients;
>
> }
> }
>
> subnet X.170.132.0 netmask 255.255.255.0
> #Vlan451
> {
>
> option domain-name-servers
> dns1, dns2;
> pool
> {
> allow members of
> "Vlan451";
> range X.170.132.2
> 192.170.132.253;
> option subnet-mask
>
> 255.255.255.0;
> option routers
>
> 1X.170.132.1;
> deny dynamic bootp
> clients;
> }
> }
> }
>
>
>
> Jun 9 08:59:32 dhcpsvr1 dhcpd: DHCPDISCOVER from 00:06:31:b4:62:a8 via
> 10.80.2.44: network E451: no free leases
>
>
>
> Thanks & Regards,
> Nisha Chandy
>
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