Custom app signature not match

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L1 Bithead

Custom app signature not match

Hello everybody,

we have the following problem. We must allow dhcp-requests from outside to our dhcp-server. I will allow only those requests, that's contain a specific ip-address of a dhcp-relay and a specific mac-address of the dhcp-client. I have capture the packet, and so I know the hex-data contains in the packet. I defined a custom app-id with parent-app dhcp, and defined a signature contains the specific hex-data (unknown-request-udp-payload, patterm-match, pattern: .*(\x96cbefc8e8039aa99e71\x) ). Also I defined a destination-port (udp/67).

But that doesn't work. The custom app-id only match, when I defined also a application-override-rule. And it also match, when I changed the signature.:-(

But I will not only override the application. I will use this custom app-id for allowing specific traffic.

What's wrong? Is it possible?

Thanks for any help.

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