RFC 1183:New DNS RR Definitions
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Route


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... X.25 and ISDN addresses, Route Binding ...
... ISDN addresses in the DNS, as well as a route binding method, ...
... The Route Through RR ...
... The Route Through RR is defined with mnemonic RT ...
... The RT resource record provides a route-through binding for hosts ...
... 16 bit integer, representing the preference of the route. Smaller numbers indicate more preferred routes. ...
... When a host is looking up DNS records to attempt to route a datagram, it first looks for RT ...



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