1. DC/X521 gateway What it does With each qeury it tries to find out the responsible ldap server and returns a referral for that server.

2. DC/X521 gateway How? " Translates the DN to a DC-DN and a X521-DN. Queries default server. " DNS-query for the SRV record. " Returns referral. " Implemented by adapting DNS back-end code of OpenLdap v. 2.0.7

3. DC/X521 gateway

4. DC/X521 gateway more heuristic approaches " Adapt the domain part of the DC_DN and put ldap. in front of it and try this LDAP-host. " Go up one or more domain parts and do a SRV- record look-up and/or put ldap. in front of it.

5. DC/X521 gateway problems " Which parts of the DN must/can be translated? " LDAP search takes time. " At this moment all searches are done as anonymous. No SASL, KERBEROS etc.

6. DC/X521 gateway to do " Implement heuristic approaches " Optimise – By changing sequence of searches – By implementing time-outs in ldap searches " etc.