Active Directory / NIS Gateway query

[cadencep45]

I am currently looking at integrating Active Directory and unix boxes on our site. Our options appear to be;

1. Active Directory / NIS gatway such as PADL
2. Active Directory / NIS gatway such as Vintella
3. Active Directory / Microsoft SFU to provide a NIS gateway
4. LDAP client on unix clients to authenticate directly via Active Directory with Unix extensions

I am looking for any recommendations or other alternatives.

The issues with the above options appear to be;

1. Active Directory / NIS gatway such as PADL
I am looking for some feedback on this.
2. Active Directory / NIS gatway such as Vintella
Seems to be equivalent to 4, ie a LDAP query to Active directory, but as an integrated solution to
active directory as the backend LDAP server rather than roll your own. I have a question regarding
compatibility with older clients who do not have an ldap client, but rather NIS only client interfaces.
3. Active Directory / Microsoft SFU to provide a NIS gateway
I have a question regarding two aspects of this;
- It appears to have separate groups for Windows and Unix, so not properly integrated.
- It does not have any kerberous integration
4. LDAP client on unix clients to authenticate directly via Active Directory with Unix extensions
- Roll your own solution - a problem with older clients who do not have a ldap interface.

Any experiences on these or other solutions much appreciated.