You can specify the local address for the client side of the LDAP connection with BindAddress, in the form hostname[:port]. Special formatting characters are permitted.

Use this parameter to set LocalAddr parameter of the underlying IO::Socket used as the LDAP client. This is usually useful only on multi-homed hosts, where you need to control the source address of the LDAP connection, perhaps for firewall rules. There is no default and the system chooses the address.