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3.9 Address Type

Another networking type provided by Bro is addr, corresponding to an IP address. The only operations that can be performed on them are comparisons for equality or inequality (also, a built-in function provides masking, as discussed below).

When configuring the Bro distribution, if you specify --enable-brov6

then Bro will be built to support both IPv4 and IPv6 addresses, and an addr can hold either. Otherwise, addresses are restricted to IPv4.