SRV RR
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... broadcasts to locate servers.
The SRV RR allows administrators to use several servers for a single
domain, to move services ...
... The format of the SRV RR ...
...
Here is the format of the SRV RR, whose DNS type code is 33:
...
... The domain this RR refers to. The SRV RR is unique in that the
name one searches for is not this name; the example near the end
shows this clearly.
...
... DNS node as the SRV RR, listing reasonable (if perhaps
suboptimal) fallback hosts for Telnet ...
... of the service ("telnet.tcp.asdf.com" for instance); each SRV RR adds
20 bytes plus the name of the target host; each NS ...
... SRV.
If the reply is NOERROR, ANCOUNT>0 and there is at least one SRV
RR which specifies the requested Service and Protocol in the
reply:
...
... - If the Additional Data section doesn't contain A RR's for all
the SRV RR's and the client may want to connect to the target
host(s) involved, the client ...
... RR's.)
- A future standard could specify that a SRV RR whose Protocol was
TCP and whose Service ...
... distribution using the Weight field.
- Future protocols could be designed to use SRV RR lookups as the
means by which clients ...
... query string, "telnet.tcp.asdf.com."
130 bytes for 4 SRV RR's, 20 bytes each plus the lengths of "new-
fast-box", "old-slow-box", "server" and "sysadmins-box" -
...