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Dell Configuration Guide for the S4048–ON System 9.14.2.4

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CoA or DM Discard

This section lists various actions that the NAS performs during CoA or DM discard.

The following activities are performed by NAS:

  • discards the packet, if dynamic authorization feature is not enabled in NAS.
  • discards the packet, if the configured shared key entry is not found for the source IP address of the packet.
  • discards the packet with invalid code field. NAS supports the following radius codes.
    • Disconnect-Request (40)
    • CoA-Request (43)
  • discards the duplicate packets, if NAS is currently processing the original packet. NAS identifies the duplicate packet with the following fields:
    • Source IP address
    • Source UDP port
    • Identifier
    • VRF ID
  • discards the packets, if length of the packet is shorter than the length field value.
  • discards the packets, if length of the packet is shorter than 20 or longer than 4096.
  • discards the packets, if request authenticator does not match the calculated MD5 checksum. NAS calculates the MD5 hash using following fields from the request:
    • Code
    • Identifier
    • Length
    • 16 Zero Octets
    • Request Attributes
    • Shared secret (based on the source IP address of the packet)
  • discards the packets, if the message-authenticator received in the request is invalid. The message-authenticator is calculated using the following fields:
    • Code Type
    • Identifier
    • Length
    • Request Authenticator
    • Attributes

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