List archive?

  Is there an archive of the mailing list where the ignorant (i.e. me)
can avoid asking questions already asked on the list?

Yes, send email to majordomo@lbl.gov with

  get bro archive

in the body.

If not, is there
experience with bro on gigE speed links

Yep - that's what we run it on at LBL and UC Berkeley.

    Vern