DHCP + ldap

[Glenn Satchell]

Hi Richard

In dhcpd.conf you have defined the subnet 192.168.3.0/24, and the dhcp 
server is 192.168.3.1. That's all fine, but you can't hand out an 
address of 192.168.4.x if you haven't defined that subnet. So the dhcp 
server falls back to offering a dynamic address, but there is no dynamic 
range defined, so there are no leases to offer.

There are a few ways to overcome this, depending on your network setup.

- Offer a fixed address in the correct subnet range, 192.168.3.x

- Create a shared network for 192.168.3.0/24 and 192.168.4.0/24

- Create a new subnet 192.168.4.0/24 and set up an appropriate relay, if 
it is a separate network.

BTW, none of the above is related to the ldap patch.

regards,
-glenn

On 05/10/10 18:58, Richard Pijnenburg wrote:
> Dear list,
>
> Ive sent the following to the maker of the ldap patch, david, but
> perhaps some one here can help me as well.
>
> ----
>
> The ldap server part works perfectly after some modifications.
>
> So I went to the dhcp server part.
>
> I've added the rules and came across some small issues.
>
> in the dhcp.conf I had to add the config rule "ldap-dhcp-server-cn"
> because you assume that the sever hostname is being used.
>
> In my own case this wasn't handy.
>
> The config rule isn't in the documentation but found it in the source code.
>
> second: I don't see anything being logged into the ldap-debug-file.
>
> third: I got 2 compile errors when I enabled the DEBUG_LDAP rule at the
> following rules:
>
> log_info ("Adding contents of subtree '%s' to config stack from '%s'
> reference", tempbv[j], search[i]);
>
> log_info ("LDAP: Parsing dhcpService DN '%s' ...", tempbv[cnt]);
>
> I don't have the complete message but it was about it was expecting a
> char but got something else.
>
> And most important is that it doesn't give out any dhcp ip's.
>
> After I enabled debug I see this:
>
> Searching for (&(objectClass=dhcpHost)(dhcpHWAddress=ethernet
> 00:50:56:b8:01:87)) in LDAP tree cn=DHCP Config,dc=ldapserver,dc=local
>
> Found dhcpHWAddress LDAP entry cn=my.host.name,cn=192.168.4.0,cn=DHCP
> Config,dc=ldapserver,dc=local
>
> Sending the following options: 'next-server 192.168.2.10;
>
> filename "pxelinux.0";
>
> fixed-address 192.168.4.20;
>
> '
>
> DHCPDISCOVER from 00:50:56:b8:01:87 via eth1: network 192.168.3.0/24: no
> free leases
>
> below you will find the slapd.conf and dhcpd.conf (passwords changed
> ofcourse ):
>
> -- slapd.conf --
>
> include /etc/openldap/schema/core.schema
>
> include /etc/openldap/schema/cosine.schema
>
> include /etc/openldap/schema/inetorgperson.schema
>
> include /etc/openldap/schema/nis.schema
>
> include /etc/openldap/schema/dhcp.schema
>
> index dhcpHWAddress eq
>
> index dhcpClassData eq
>
> allow bind_v2
>
> pidfile /var/run/openldap/slapd.pid
>
> argsfile /var/run/openldap/slapd.args
>
> database bdb
>
> suffix "dc=ldapserver,dc=local"
>
> rootdn "cn=root,dc=ldapserver,dc=local"
>
> rootpw {SSHA}ECKv2sa9F2kP46OwVJAD9oZGUezOL++z
>
> directory /var/lib/ldap
>
> index objectClass eq,pres
>
> index ou,cn,mail,surname,givenname eq,pres,sub
>
> index uidNumber,gidNumber,loginShell eq,pres
>
> index uid,memberUid eq,pres,sub
>
> index nisMapName,nisMapEntry eq,pres,sub
>
> -- dhcp.conf --
>
> log-facility local7;
>
> subnet 192.168.3.0 netmask 255.255.255.0 {
>
> }
>
> ldap-server "localhost";
>
> ldap-port 389;
>
> ldap-username "cn=root,dc=ldapserver,dc=local";
>
> ldap-password "myprivatepassword";
>
> ldap-base-dn "dc=ldapserver,dc=local";
>
> ldap-dhcp-server-cn "root";
>
> ldap-method dynamic;
>
> ldap-debug-file "/var/log/dhcp-ldap-startup.log";
>
> in this case the server has 192.168.3.1 as IP address and i try to give
> out 192.168.4.x IP via a fixed IP from the mac address.
>
> according to the debug message it found the host and got the information
> and is sending it.
>
> But on the other hand it seems it doesn't parse it correctly or something.
>
> I hope some one can give me a hint what i'm doing wrong.
>
> With best regards,
>
> Richard Pijnenburg
>