Multihomed

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A host which is said to be multihomed is one which has more than one network interface each of which has different IP addresses.

While such hosts are *supposed* to send all packets out an interface with a source address assigned to that interface, not all always do, and there are some valid reasons why that might happen.

Such hosts/sites will require special handling from BCP38 implementing access providers, but their number is generally small enough to make handling such things as manual exceptions a reasonable process.

More details on exactly what that special handling is, and how such sites and their providers (who are themselves generally multihomed) might implement it, can be found in RFC 3704, which is BCP84.

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