# documentation:2.0:federationproxy
Keywords: documentation,2.0,federationproxy

# LL::NG as federation protocol proxy

LL::NG can use federation protocols (SAML, CAS, OpenID) independently to:

- authenticate users
- provide identities to other systems

So you can configure it to authenticate users using a federation protocol and simultaneously to provide identities using other(s) federation protocols.

Schemes validated:

- SAML-SP ⇔ LLNG as SAML/OpenID-Connect proxy ⇔ OIDC Provider
- OIDC-RP ⇔ LLNG as OpenID-Connect/SAML proxy ⇔ SAML Identity Provider

Note that OpenID-Connect consortium hasn't already defined single-logout initiated by OpenID-Connect Provider. LLNG will implement it when this standard will be published.

Development of federation can be complex. Don't hesitate to contact us on lemonldap-ng-users@ow2.org

See the following chapters:

- Authentication protocols
- Identity provider