OpenLDAP slave-master synchronization problem

Hello，

I have two openldap servers, and have configured the master-slave synchronization, but have a problem:

When an entry in master server is changed it is automatically changed in the slave server.

But, when an entry in slave server is changed it is not automatically changed in the master server.

In the slave server slapd.conf config file, I've set up “updateref ldap://192.168.100.11:389“ , the 192.168.100.11 is my master server.

The following is my configuration.

Master Configuration:

allow bind_v2

pidfile /var/run/openldap/slapd.pid

argsfile /var/run/openldap/slapd.args

access to *

by * write

database bdb

suffix "dc=domain,dc=com"

rootdn "cn=root,dc=domain,dc=com"

overlay ppolicy

rootpw {SSHA}DyNIn6rweGRnQP0ntGaZxynMllSA3/w4

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

replogfile /var/lib/ldap/openldap-master-replog

loglevel 4095

replica host=192.168.70.15:389

binddn="cn=sa,dc=domain,dc=com"

bindmethod=simple credentials=miao3p

Slave Configuration: