DHCP server unable to assign fixed address in a DHCP relay setup
Comandini, Gianluca
Gianluca_Comandini at alliedtelesis.com
Fri Jun 26 15:14:10 UTC 2009
Thanks a lot glenn, I'll let you know if this works fine!
gianluca
-----Original Message-----
From: dhcp-users-bounces at lists.isc.org [mailto:dhcp-users-bounces at lists.isc.org] On Behalf Of Glenn Satchell
Sent: 2009-06-26 17:06
To: dhcp-users at lists.isc.org
Subject: Re: DHCP server unable to assign fixed address in a DHCP relay setup
hi Gianluca,
Try moving the host {} statements so they are outside the pool {}. The best position is to put them in the global space outsode all the subnet declarations.
host statements are global, but putting them inside a pool or subnet restricts where they can inherit settings from.
regards,
-glenn
>From: "Comandini, Gianluca" <Gianluca_Comandini at alliedtelesis.com>
>To: "'dhcp-users at lists.isc.org'" <dhcp-users at lists.isc.org>
>Date: Fri, 26 Jun 2009 12:53:14 +0200
>Subject: DHCP server unable to assign fixed address in a DHCP relay
>setup
>
> Hi All,
>
> This is my first post on this list, hope someone can help me with this
> strange
DHCP server behavior.
> I have got a lab which simulates an ADSL service provider network. My
> network
is something like this:
>
> CPEs (HAG)-----------DSLAM(DHCP relay)----------Router--------DHCP Server
> Sub 192.168.x.x Sub 172.30.1.x
Sub 192.168.x.x
>
> I'm able to setup my DHCP Server to correctly assign ip addresses to
> the CPEs,
with an intermediary DHCP relay in the middle. My dhcp server is a linux PC (Fedora 10: 2.6.27.5-117.fc10.i686) with isc-dhcpd-4.0.0 package.
> But this is just working if I set the DHCP Server to assign
> ip-addresses in a
range (for example range 192.168.2.10 192.168.2.50). When I'm trying to assign a fixed address to a single CPE, for example with the statements:
> host {
> hardware ethernet 00:0d:da:00:28:1d;
> fixed-address 192.168.2.51;
> }
> This is not working. All subnets 192.168.2.x, 192.168.3.x and
> 192.168.4.x get
the same ip address on the subnet 192.168.2.x and the CPE is reporting an ip-address overlapping error.
> It seem that DHCP server is not able to correctly match the
> agent.remote-id
and agent.circuit-id of the incoming DHCP packet and select the correct fixed address to serve all subnets with the correct fixed address.
> If I remove the host and fixed-address statements all is working fine
> and each
CPE could have all his subnets correctly served with a correct ip-address. So the issue is just when trying to assign a static fixed address.
> Here is my DHCP.conf file in the non working case:
>
> ddns-update-style none;
>
> class "MAP-MGMT" {
> match if (substring (option agent.remote-id,0,3)="NE1") and (substring
> (option
agent.circuit-id,2,1)="\x00\x66");
> }
>
> class "MAP-Voip" {
> match if (substring (option agent.remote-id,0,3)="NE1") and (substring
> (option
agent.circuit-id,2,1)="\x00\x67 ");
> }
>
> class "MAP-Data" {
> match if (substring (option agent.remote-id,0,3)="NE1") and (substring
> (option
agent.circuit-id,2,1)="\x00\x68");
> }
>
> class "MAP-Video" {
> match if (substring (option agent.remote-id,0,3)="NE1") and (substring
> (option
agent.circuit-id,2,1)="\x00\x69");
> }
>
> shared-network NE1 {
> subnet 192.168.8.0 netmask 255.255.255.0 {}
> #******************************************************************
> #MANAGEMENT subnet 192.168.2.0 (netmask 255.255.255.0) configuration
> #this subnet belongs to vlan 102
> #******************************************************************
> subnet 192.168.2.0 netmask 255.255.255.0 {
>
>
> option subnet-mask 255.255.255.0;
> max-lease-time 6000;
> default-lease-time 6000;
>
> pool {
> range 192.168.2.10 192.168.2.50;
> host RG613LH-2 {
> hardware ethernet 00:0d:da:00:28:1d;
> fixed-address 192.168.2.51;
> }
> host iMG634A-R2-ADSL-2 {
> hardware ethernet 00:0d:da:0b:49:c9;
> fixed-address 192.168.2.52;
> }
> allow members of "MAP-MGMT";
> }
> }
> #******************************************************************
> #VOIP subnet 192.168.3.0 (netmask 255.255.255.0) configuration #this
> subnet belongs to vlan 103
> #******************************************************************
> subnet 192.168.3.0 netmask 255.255.255.0 {
>
>
> option subnet-mask 255.255.255.0;
> max-lease-time 6000;
> default-lease-time 6000;
>
> pool {
> range 192.168.3.10 192.168.3.50;
> host RG613LH-3 {
> hardware ethernet 00:0d:da:00:28:1d;
> fixed-address 192.168.3.51;
> }
> host iMG634A-R2-ADSL-3 {
> hardware ethernet 00:0d:da:0b:49:c9;
> fixed-address 192.168.3.52;
> }
> allow members of "MAP-Voip";
> }
> }
>
> #******************************************************************
> #DATA subnet 192.168.4.0 (netmask 255.255.255.0) configuration #this
> subnet belongs to vlan 104
> #******************************************************************
> subnet 192.168.4.0 netmask 255.255.255.0 {
>
>
> option subnet-mask 255.255.255.0;
> max-lease-time 6000;
> default-lease-time 6000;
>
> pool {
> range 192.168.4.10 192.168.4.50;
> host RG613LH-4 {
> hardware ethernet 00:0d:da:00:28:1d;
> fixed-address 192.168.4.51;
> }
> host iMG634A-R2-ADSL-4 {
> hardware ethernet 00:0d:da:0b:49:c9;
> fixed-address 192.168.4.52;
> }
> allow members of "MAP-Data";
> }
> }
>
> #******************************************************************
> #VIDEO subnet 192.168.5.0 (netmask 255.255.255.0) configuration #this
> subnet belongs to vlan 105
> #******************************************************************
> subnet 192.168.5.0 netmask 255.255.255.0 {
>
>
> option subnet-mask 255.255.255.0;
> max-lease-time 6000;
> default-lease-time 6000;
>
> pool {
> range 192.168.5.10 192.168.5.50;
> host RG613LH-5 {
> hardware ethernet 00:0d:da:00:28:1d;
> fixed-address 192.168.5.51;
> }
> host iMG634A-R2-ADSL-5 {
> hardware ethernet 00:0d:da:0b:49:c9;
> fixed-address 192.168.5.52;
> }
> allow members of "MAP-Video";
> }
> }
> }
>
>
> To have the working fine case it's enough to remove the hosts declarations:
>
>
> ddns-update-style none;
>
> class "MAP-MGMT" {
> match if (substring (option agent.remote-id,0,3)="NE1") and (substring
> (option
agent.circuit-id,2,1)="\x00\x66");
> }
>
> class "MAP-Voip" {
> match if (substring (option agent.remote-id,0,3)="NE1") and (substring
> (option
agent.circuit-id,2,1)="\x00\x67 ");
> }
>
> class "MAP-Data" {
> match if (substring (option agent.remote-id,0,3)="NE1") and (substring
> (option
agent.circuit-id,2,1)="\x00\x68");
> }
>
> class "MAP-Video" {
> match if (substring (option agent.remote-id,0,3)="NE1") and (substring
> (option
agent.circuit-id,2,1)="\x00\x69");
> }
>
> shared-network NE1 {
> subnet 192.168.8.0 netmask 255.255.255.0 {}
> #******************************************************************
> #MANAGEMENT subnet 192.168.2.0 (netmask 255.255.255.0) configuration
> #this subnet belongs to vlan 102
> #******************************************************************
> subnet 192.168.2.0 netmask 255.255.255.0 {
>
>
> option subnet-mask 255.255.255.0;
> max-lease-time 6000;
> default-lease-time 6000;
>
> pool {
> range 192.168.2.10 192.168.2.50;
> allow members of "MAP-MGMT";
> }
> }
> #******************************************************************
> #VOIP subnet 192.168.3.0 (netmask 255.255.255.0) configuration #this
> subnet belongs to vlan 103
> #******************************************************************
> subnet 192.168.3.0 netmask 255.255.255.0 {
>
>
> option subnet-mask 255.255.255.0;
> max-lease-time 6000;
> default-lease-time 6000;
>
> pool {
> range 192.168.3.10 192.168.3.50;
> allow members of "MAP-Voip";
> }
> }
>
> #******************************************************************
> #DATA subnet 192.168.4.0 (netmask 255.255.255.0) configuration #this
> subnet belongs to vlan 104
> #******************************************************************
> subnet 192.168.4.0 netmask 255.255.255.0 {
>
>
> option subnet-mask 255.255.255.0;
> max-lease-time 6000;
> default-lease-time 6000;
>
> pool {
> range 192.168.4.10 192.168.4.50;
> allow members of "MAP-Data";
> }
> }
>
> #******************************************************************
> #VIDEO subnet 192.168.5.0 (netmask 255.255.255.0) configuration #this
> subnet belongs to vlan 105
> #******************************************************************
> subnet 192.168.5.0 netmask 255.255.255.0 {
>
>
> option subnet-mask 255.255.255.0;
> max-lease-time 6000;
> default-lease-time 6000;
>
> pool {
> range 192.168.5.10 192.168.5.50;
> allow members of "MAP-Video";
> }
> }
> }
>
>
> I thank you in advance for all your replies and if you need more
> details and
information don't hesitate to ask me.
>
> Best Regards
> Gianluca
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