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Cisco Bug: CSCvt97947 - Release notes do not adequately describe the impact of deprecated FlexConfig commands in 6.3+

Last Modified

Jul 21, 2020

Products (1)

  • Cisco Firepower Management Center

Known Affected Releases

6.3.0 6.4.0 6.5.0 6.6.0

Description (partial)

Some versions of the Firepower release notes do not adequately explain the consequences of particular deprecated FlexConfig commands, including:

set connection advanced-options tcp-state-bypass
set connection random-sequence-number disable
set connection timeout idle

Version 6.3.0 deprecates these FlexConfig objects for FTD with FMC:
* TCP_Embryonic_Conn_Limit
* TCP_Embryonic_Conn_Timeout

And these associated text objects:
* tcp_conn_misc
* tcp_conn_limit
* tcp_conn_timeout

These allowed you to configure embryonic connection limits and timeouts to protect against SYN Flood Denial of Service (DoS) attacks.
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