[Bro-Dev] [JIRA] (BIT-1363) Clustered AF_PACKET support

Michal Purzynski (JIRA) jira at bro-tracker.atlassian.net
Fri Apr 3 13:16:00 PDT 2015

    [ https://bro-tracker.atlassian.net/browse/BIT-1363?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=20237#comment-20237 ] 

Michal Purzynski commented on BIT-1363:


PACKET_FANOUT_HASH, sends packets from
                 the same flow to the same socket to maintain per-flow
                 ordering.  For each packet, it chooses a socket by taking
                 the packet flow hash modulo the number of sockets in the
                 group, where a flow hash is a hash over network-layer
                 address and optional transport-layer port fields.

So each process would need to create a socket and join the same group of sockets with setsockopt() and begin receiving packets.
FANOUT_HASH has even an optional defragmenting support.

> Clustered AF_PACKET support
> ---------------------------
>                 Key: BIT-1363
>                 URL: https://bro-tracker.atlassian.net/browse/BIT-1363
>             Project: Bro Issue Tracker
>          Issue Type: New Feature
>          Components: Bro
>    Affects Versions: git/master
>            Reporter: Michal Purzynski
> Let's have a support for packet capture with the AF_PACKET sockets in multi worker configuration.
> Bro can use a single worker with af_packet, I have tested and it works, but having a direct support for multi-worker load balancing would allow to avoid the pf_ring for many deployments with the traffic level where DNA / ZC / Myricom / DAG is not required.

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