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Cisco Bug: CSCtb56607 - GETVPN: GM does not perform PMTUD correctly with TBAR

Last Modified

Feb 15, 2018

Products (1)

  • Cisco IOS

Known Affected Releases

12.4(24.6)PI11u 12.4(24.6)PI11v 15.0M 15.1(0.2)PI12e

Description (partial)


On a Cisco IOS router configured with GET (Group Encrypted Transport), if 
Time Based Anti Replay is enabled, then upon receiving a large packet with 
the DF (Don't Fragment) bit set, the router does not send the correct next-hop-mtu 
value in the ICMP packet-too-large but DF bit set messages. This breaks PMTUD
(Path MTU Discovery). 

This is only a problem when Time Based Anti Replay is enabled.
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