[Bro-Dev] [JIRA] (BIT-1480) ERSPAN Supprt

Matthew Domko (JIRA) jira at bro-tracker.atlassian.net
Fri Sep 18 04:49:00 PDT 2015

Matthew Domko created BIT-1480:

             Summary: ERSPAN Supprt
                 Key: BIT-1480
                 URL: https://bro-tracker.atlassian.net/browse/BIT-1480
             Project: Bro Issue Tracker
          Issue Type: New Feature
          Components: Bro
    Affects Versions: 2.3
         Environment: Using vCenter virtual switch, frames from monitored VMs are encapsulated using GRE and forwarded to my sensor on a different broadcast domain.
            Reporter: Matthew Domko
         Attachments: erspan

PCAP attached... Basically, bro recieves the erspan packet and doesn't recognize that it is just GRE with a slightly different format. All the packets get logged in bro with the ERSPAN source/dest addresses instead of the actual source/dest addresses. It seems like everything else is working. 

There was a discussion about this on a mailing list in the past, but no one provided PCAP.

And someone else released a tool to do the decapsulation on the side:

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