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Cisco Bug: CSCtb73586 - 2941: Pkts fragmented over GRE tunnel when DF bit set

Last Modified

Jan 30, 2017

Products (1)

  • Cisco MWR 2900 Series Mobile Wireless Routers

Known Affected Releases


Description (partial)


A packet sent over a GRE tunnel may be fragmented even if the DF (Don't Fragment) bit is set in the packet.


Fragmentation will only occur if the size of the packet to be transmitted is larger than the outbound interface MTU size. The issue is only observed on Cisco IOS Release 12.4(20)MR.
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