I have got some wireshark captures, and it shows that it is UDP. But in theory it says that it uses both TCP and UDP. So I m confused. And what is the difference b/w LDAP and CLDAP? Are they both UDP protocols?
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2 Answers
Normally LDAP is a TCP protocol. But Microsoft uses LDAP also over UDP. See here: http://msdn.microsoft.com/en-us/library/cc717362(v=prot.10).aspx
So it is both.
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Lightweight Directory Access Protocol (LDAP) The Lightweight Directory Access Protocol: The protocol accessing data from directory services like OpenLDAP, Microsoft Active Directory, Netscape Directory Server or Novell eDirectory.
Protocol dependencies TCP/UDP: Typically, LDAP uses TCP or UDP (aka CLDAP) as its transport protocol. The well known TCP and UDP port for LDAP traffic is 389.
SSL/TLS: LDAP can also be tunneled through SSL/TLS encrypted connections. The well known TCP port for SSL is 636 while TLS is negotiated within a plain TCP connection on port 389.
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Karel Vlk
Note that LDAPS (on port 636 by default) does not really use the outdated SSL. It also uses TLS (unless the system is really ancient). Instead of referring to the two modes as "SSL" vs "TLS", it should be "implicit TLS" or "LDAPS" vs "explicit TLS" or "STARTTLS".