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Proxies
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... RADIUS] does not provide for explicit support for agents,
including Proxies, Redirects and Relays. Since the expected
behavior is not defined, it varies between implementations.
Diameter ...
... RADIUS does not define data-object security mechanisms, and as a
result, untrusted proxies may modify attributes or even packet
headers without being detected. Combined with lack of support for
capabilities negotiation ...
... roaming between providers. However, since
RADIUS does not provide explicit support for proxies, and lacks
auditability and transmission-level security features, RADIUS ...
... authenticate and/or authorize messages
locally; agents include proxies, redirects and relay agents. A
Diameter server ...
... Agent or Proxy
In addition to forwarding requests and responses, proxies make
policy decisions relating to resource usage and provisioning.
This is typically accomplished by tracking the state ...
... state of NAS
devices. While proxies typically do not respond to client
Requests prior to receiving a Response from the server, they may
...
... receiving a Response from the server, they may
originate Reject messages in cases where policies are violated.
As a result, proxies need to understand the semantics of the
messages passing through them, and may not support all Diameter
applications ...
... Diameter Routing Table. However, they differ since they modify
messages to implement policy enforcement. This requires that proxies
maintain the state of their downstream ...
... provisioning.
It is important to note that although proxies MAY provide a value-add
function for NASes, they do not allow access devices to use end-to-
...
... authentication.
Proxies MAY be used in call control centers or access ISPs that
provide outsourced connections ...
... according to their configuration.
Proxies that wish to limit resources MUST maintain session state.
...
... Since enforcing policies requires an understanding of the service
being provided, Proxies MUST only advertise the Diameter applications
they support.
...
... Diameter agents
(proxies, redirects or relays) MUST also contain an Acct-
Application-Id AVP, an Auth-Application-Id ...
... Diameter
agents (proxies, redirects or relays) MUST not include the
Destination-Realm in its ABNF ...
... Diameter message that may be forwarded by Diameter agents (proxies,
redirects or relays) MUST include the target realm in the
...
... on a per-hop basis, and Diameter proxies MAY attempt to correct the
error, if it is possible. Note that these and only these errors MUST
only be used in answer messages ...
... connected with the access device will not discover that the access
device has been restarted unless and until it receives a new request
from the access device. Thus, use of this mechanism across proxies
is opportunistic rather than reliable, but useful nonetheless.
...