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Cisco Bug: CSCuq02795 - PXE TFTP fails in ZBF (zone based firewall) running 15.x code

Last Modified

Feb 03, 2017

Products (1)

  • Cisco IOS

Known Affected Releases

15.1(1.4)

Description (partial)

Symptom:
Routers running 15.x code using ZBF with TFTP inspect may encounter problems with passing PXE traffic.  This leads to computers not being able to utilize PXE during boot.  The router may report the TFTP packet as being dropped.

For example:

FW-6-DROP_PKT Dropping udp session 10.10.10.10:69 10.10.10.20:57089 on zone-pair in-out class class-in-out  with ip ident 0

Conditions:
- Routers running 15.x code
- Zone based firewall
- TFTP inspect
- PXE traffic in the network
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Bug Details Include

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