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Cisco Bug: CSCta73054 - NAT VRF Breaks Passive FTP Sessions.

Last Modified

Jan 24, 2017

Products (1)

  • Cisco IOS

Known Affected Releases

12.2(31)SB14 12.2(33)SB5 12.2(33)SRC5 12.2(33)XNE 12.2(33)XNF

Description (partial)

Symptoms: When using passive FTP with NAT VRF, the connection is broken after 
NAT in the Cisco 7300. The port numbers are not consistent.

The source port is translated from "X_PORT" to "Y_PORT", but after NAT to the 
outside, the port still remains the same. This breaks the passive FTP session.

Conditions: This issue is observed when using Cisco IOS Releases 12.2(31)SB11, 
12.2(31)SB14, 12.2(33)SB3a and 12.2(33)SB5 when using VRF NAT 
and trying to establish passive FTP connections across the Cisco 7300.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
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  • Known Fixed Releases
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