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Cisco Bug: CSCuq11769 - Fragmentation does not happen before encryption

Last Modified

Nov 27, 2020

Products (113)

  • Cisco 2600 Series Multiservice Platforms
  • Cisco C897VA Integrated Services Router
  • Cisco 1905 Serial Integrated Services Router
  • Cisco VG204XM Analog Voice Gateway
  • Cisco 898 Secure G.SHDSL EFM/ATM with Multi-Mode 4G LTE ISR Router
  • Cisco C892FSP Integrated Services Router
  • Cisco 886VAG 3G Integrated Services Router
  • Cisco 2951 Integrated Services Router
  • Cisco 819 Hardened Integrated Services Router
  • Cisco 861W Integrated Services Router
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Known Affected Releases

15.2(4)M6 15.3(3)M4.2 15.4(3)M 15.5(2.21)S0.2

Description (partial)

After IPsec session is created, packets larger than the size of outbound MTU are not fragmented before encryption. Instead, the packets are getting fragmented in the IP layer after encryption.

This behavior is currently seen with a router running as EzVPN remote.
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