I am trying to utilize NBAR protocol-discovery to determine what application are active on a lan segment to include IPv4/IPv6 traffic.
My router does not support NBAR for IPv6. Upgrading is not an option yet. NBAR allows for custom filters so I want to create a filter to look into the packet headers and seek out the IPv6 version field.
The configuration option calls for "Enter BTYE Location of value to be searched on payload" which I am assuming means the offset from the beginning of the packet.
Anyone know this value?
Here is the router output for this setup.
R# ip nbar custom IPV6 ?
<0-255> Enter BTYE Location of value to be searched on payload
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