DNS SRV
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... Service
Location Protocol (SLP) [RFC2608] via DNS SRV [RFC2782]. We consider
remote service discovery ...
... multicast).
DNS SRV provides good support for remote service discovery. However,
if multiple servers are discovered via DNS SRV ...
... DNS SRV provides good support for remote service discovery. However,
if multiple servers are discovered via DNS SRV for a service, only
priority ...
... service properties (such as cost, speed and service quality) need to
be considered in the selection process, DNS SRV becomes insufficient.
We propose that using SLP ...
...
We propose that using SLP and DNS SRV together can provide better
support for remote service discovery. First, a UA ...
... support for remote service discovery. First, a UA uses DNS SRV to
find SLP DAs at a remote DNS ...
... services. In this way, we can
avoid the limitations in using SLP and DNS SRV separately. On one
hand, without DNS SRV, an SLP ...
... SLP and DNS SRV separately. On one
hand, without DNS SRV, an SLP UA needs to depend on static
...
... administrative domain. On the other hand, without SLP, DNS SRV has
limited support for service selection.
...
... domain. Then, we discuss various issues in using SLP and DNS SRV
together for remote service discovery. Finally, we give the steps
...
... SLP DAs can be discovered in two ways: (1) using the mechanisms
described in RFC 2608, and (2) using DNS SRV RRs as described in this
document. The second approach is useful for UAs ...
... UA uses remote DAs
according to these prioritized rules: (1) using DAs which it has been
configured with, and (2) using DAs which it has discovered via DNS
SRV.
...
... service MUST be
registered in the "default" scope, but it MAY be registered in other
scopes at the same time. Similarly, all DAs advertised via DNS SRV
MUST serve the "default" scope, but they MAY serve other scopes at
the same time. As a result, users wishing to discover services ...
... IN, and QTYPE=SRV. Then, U gets a
list of DNS SRV RRs (referred to as L) in a DNS reply, which
...
... queries that are not in the "default" scope. In addition, the
security considerations for DNS SRV [RFC2782] apply to this document.
Also, the DNS security extensions ...
... This specification describes remote service discovery in SLP via DNS
SRV. It facilitates discovering services at a remote DNS domain ...
...
Users should be aware of two constraints in using DNS SRV to discover
SLP DAs: (1) they SHOULD only use DNS SRV ...
... DNS SRV to discover
SLP DAs: (1) they SHOULD only use DNS SRV to discover DAs in the
"default" scope, and (2) an administrator may choose to register ...
... administrator may choose to register only
a subset of all DAs in the "default" scope via DNS SRV. Thus, to
discover local DAs, implementations MUST use the standard SLP
...
... mechanisms per RFC 2608. In addition, implementations supporting
this specification MAY use DNS SRV to discover local DAs in the
"default" scope.
...
...
Note that the services discovered via DNS SRV and remote SLP DAs may
not necessarily be remotely accessible.
...