Hi, Dmitry.
Ok, now I see your situation is somewhat unusual.
1. By default, Gluu's OpenDJ LDAP directory server does not filter in any way clients' connections to it. The only obstacle you may encounter is, as Mike has already noted, different firewalls software, both local to the Gluu's host (iptables), and installed on some other intermediate devices present on your network. Any sort of NAT devices will also increase complexity of the final setup. In a nutshell, you need to ensure that incoming TCP connections to ports 1389/1636 (these are ports on which OpenDJ is listening by default) can reach host where your Gluu instance is located.
2. For bind DN ```"cn=directory manager"``` can endeed be used. Its password is equal to the password of the default admin account right after installation is completed (it's either chosen by you, or auto-generated during setup). You also can view it by running ```# grep -i -e 'ldappass=' /install/community-edition-setup/setup.properties.last```
3. For base DN you should choose ```"ou=people,o=@!YOUR_ORG_INUM,o=gluu"```; ```"YOUR_ORG_INUM"``` part you can learn by running ldap search against internal directory with a filter clause like ```('ou=people')```
4. For user search pattern you should use something like ```(&(objectclass=gluuperson)(uid={0}))```