I have a new Samba 3 domain backed by LDAP. I am using Fedora-DS for LDAP component, so I have relied on a blend of tools to get up and running including Fedora-DS console and phpLDAPAdmin and (momentarily!) sambaldap-tools. I am generally following the great IDEALX How-To but having to adapt it somewhat. Standards for well-know Samba groups like "Domain Admins" were easy to find in the Samba Guide and elsewhere. I have added Samba accounts for PDC and 15-20 additional user and groups, but saw that I might be introducing some inconsistencies. Examples for adding well-know groups mapped 3-digit RIDs to 4-digit GIDs starting with 2xxx presumably to avoid conflicts, so I started to follow that for Users/Groups but then wondered "Why the heck am I doing that?" :) Then a moment ago I noticed that I managed to add PDC machine account with SambaSID that is identical to Domain SID (ending in "-") where other examples definitely show DCs with RIDs. Oops, I think. So my email is to ask if there is a How-To or best-practice reference page (I found a few partial references on MSDN) that spells out ideal/accepted SID/RID methods/numbering and UID/GID mapping? It seems that, other than well-know accounts, RIDs are arbitrary by design. Part of my small problem is that I thought auto-increment/complete functions were working at a few times when they were not. Also, I was thinking that, because I have a replicated LDAP instance on both PDC and BDC, I should have no need of the "idmap" feature and wasn't consciously thinking UID-GID ranges. That, along with truncating RIDs, is now seeming short-sighted. So I think I have a few small corrections to make, but figured I would step back and query the list before I add 400 user records! Thanks, Jim