Re: On the subject of multihoming

From: Scott Doty (no email)
Date: Wed Nov 12 2008 - 12:18:05 EST

  • Next message: Kee Hinckley: "Re: [funsec] McColo: Major Source of Online Scams and Spams Knocked Offline (fwd)"

    [ resent to list, was sent from the wrong address -sd ]

    Charles Wyble wrote:
    > I'm working on a small experiment which utilizes multiple outbound
    > links (in the experiments case multiple consumer 3G connections [to 2
    > Sprint/2 Verizon/1 AT&T], Time Warner Cable Modem and an SBC Global
    > DSL connection.
    >
    > What is the best way to do outbound traffic engineering? I would like
    > to be able to determine the best path possible and send traffic out
    > the appropriate link.

    Not sure if this is useful, but I thought I'd contribute a point on the
    curve...

    from NANOG 9:

       http://www.academ.com/nanog/feb1997/multihoming.html

    Obquote: from Paul Vixie's presentation,
    from Stan Barber's notes, here is the "meat of the matter":

    _ _ _ _ _ _ _
    Per-interface Default Route

        * BSD TCP binds outbound route to PCB on SYN-ACK
        * Our trick: remember the inbound interface identity from the SYN
        * Each interface has its own "default route"
        * For outbound TCP and all UDP, a normal default is also needed.

    _ _ _ _ _ _ _

    Hope that helps...

    -Scott


  • Next message: Kee Hinckley: "Re: [funsec] McColo: Major Source of Online Scams and Spams Knocked Offline (fwd)"





    Hosted Email Solutions

    Invaluement Anti-Spam DNSBLs



    Powered By FreeBSD   Powered By FreeBSD