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