As Black get rout rout designated, the IP packages, which would have to be fragmented to the far dispatch, without feedback rejects.

IP minutes are in such a way laid out that it can be transported over different technologies (Ethernet, Frame Relay etc.) of the link layer (Layer 2 in the OSI model). Each of these technologies has a certain maximum package size, the maximum in such a way specified transfer unit (MTU). If data of a Schicht-2-Technologie are over another Schicht-2-Technologie, whose maximally permitted package size is smaller than those the first technology, to be transported, the dismantling (fragmenting) of the IP package is necessary.

Fragmenting affects itself however unfavorably the achievement of the particulars routs out, since it stresses their processor and main memory resources. For this reason with TCP data the DF-flag in such a way specified (DF=Don't fragment - do not fragment) to the value 1 is set, which rout from the dismantling of the package prevents. Rout, which is to obtain a IP package that would have to be divided, because of the DF-flag however not be divided may not, can the transmitter after RFC 792 or RFC 1191 with the ICMP message Destination Unreachable fragmentation Needed and DF set answer. Rout, which does not send an answer, but tacitly rejects the package, is called Black get routing.

Such Black get routing prevent also the automatic determination of the greatest possible MTU along a network path with the help of the Path MTU Discovery procedure.

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