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

Matthew Domko (JIRA) jira at bro-tracker.atlassian.net
Sat Sep 19 06:34:00 PDT 2015

    [ https://bro-tracker.atlassian.net/browse/BIT-1480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=22111#comment-22111 ] 

Matthew Domko commented on BIT-1480:

More research, just trying to save the devs some time... Will keep adding as I find it. If it's not helpful, just let me know.

Ciscos implementation uses GRE protocol type 0x88BE . Relevant pages from link attached.Includes a generic packet format graphic

> 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
>            Assignee: Vlad Grigorescu
>              Labels: ERSPAN
>         Attachments: erspan, ERSPAN-info.xps
> 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.
> http://mailman.icsi.berkeley.edu/pipermail/bro/2015-April/008347.html
> And someone else released a tool to do the decapsulation on the side:
> http://staff.washington.edu/corey/gulp/

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