Re: 2 adsl connections load balancing with natd/ipfw

From: Martin Jessa (freebsd_at_yazzy.org)
Date: 05/26/04

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    Date: Wed, 26 May 2004 17:09:20 +0200
To: freebsd-isp@freebsd.org

    Even though I love BSD, I'd rather get a cheap box like: http://www.infosmart.com.tw/p-ndr3024.htm and get it done in a metter of minutes.
    It's cheaper than a PC and time you use on similar BSD solution...

    On Wed, 26 May 2004 09:58:37 -0400
    Don Bowman <don@sandvine.com> wrote:

    > From: Eric Anderson [mailto:anderson@centtech.com]
    > > Emre Bastuz wrote:
    > > [..snip..]
    > >
    > > >So far I did not find any tutorial or howto or whatever to
    > > achieve my goal with
    > > >FreeBSD. I assume right now there is no satisfying way to
    > > use your two lines
    > > >with BSD except with dedicated hardware.
    > > >
    > > >
    > >
    > > Isn't it possible to use ipnat on a FreeBSD box, and use the load
    > > distribution/reverse nat stuff in it to spread the requests
    > > out between
    > > the two connections? It's not perfect, but it's something.
    > >
    > > Basically, I think you'd set up a FreeBSD box as 'the router', so
    > > clients would point to it's interface for their gateway (or
    > > however you
    > > want to set it up), then the FreeBSD box would distribute requests
    > > between the two 'real' router IP's. I'm not certain this
    > > will work, but
    > > just a thought..
    > >
    >
    > Run two natd. Use ipfw 'probability' to pick one, and make the
    > rule keep state so that the session sticks to the natd it has
    > chosen. The only problem i have found is that each tcp session
    > may then pick a different natd, couldn't figure out how to
    > stick it to the source ip. It does work tho. No bgp, isp intervention,
    > etc, reqired. The freebsd box running the natd will only use
    > one of the two connections for its default route, but the hosts
    > behind it using it as a gateway will use both.
    >
    > --don
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