Oh yeah, couple of catches:
1) you need to have enough IP addresses from one of your providers that
you're NAT'ing to a valid IP address which is still routable from the
LRP (in other words, at least 5 usable addresses, most of which you'll
lose to subnetting.
2) anti-spoofing rules may block you from the other ISP's circuit.
These issues are basic to routing, unfortunately -- you're not going to
have any better luck with a $10K Cisco router unless you use BGP (see
http://www.monkeynoodle.org/lrp/LRP-Load-Balancing-HOWTO.html for what
this will require).
Jack
On Sat, 15 Sep 2001, Jack Coates wrote:
> Well, maybe listen-only BGP would help (see zebra.lrp), but probably
> not since you're still doing NAT and it will hose TCP communications if
> half the packets are masq'ed with one IP and the other half are masq'ed
> with the other IP. Not to mention that I still haven't been able to
> get any Linux box to masq on two different external interfaces --
> masq'ing N internal interfaces behind a single external works, but
> multiple externals doesn't for me.
>
> The problem is that when you have two circuits to two totally different
> networks, the router has to send the traffic belonging to a given
> session on one or the other pipe in order to avoid breaking a lot of
> assumptions -- unless you're doing NAT before it even gets to your
> LRP... hmm, just thought of that...
>
> -> Cable
> LAN <-> NAT <-> LRP <
> -> DSL
>
> Now the LRP can safely round-robin its two external circuits without
> breaking anything. All you need to make that happen is equal-cost
> multipath routing, which is explained nicely in the Advanced Networking
> HOWTO on www.linuxdocs.org.
>
> Man, I'll have to try this myself after the kids go to bed :-)
>
> Jack
>
>
> On Sat, 15 Sep 2001, David McBride wrote:
>
> > Is there another floppy distro of Linux that can do this in a better way?
> >
> > Thanks,
> > David
> >
> >
> >
> > -----Original Message-----
> > From: Jack Coates [mailto:[EMAIL PROTECTED]]
> > Sent: Friday, September 14, 2001 10:12 PM
> > To: David McBride
> > Cc: LEAF list (E-mail)
> > Subject: Re: [Leaf-user] DSL and Cable combination question
> >
> >
> > On Fri, 14 Sep 2001, David McBride wrote:
> >
> > > I am new to LEAF. I would like to combine DSL and Cable into a single
> > > bandwidth. I have a Pentium 100 with 32 MB and 3 NICs. One KNE110 and
> > two
> > > SMC 1211TX. I downloaded and created a LEAF disk from LEAF website. File
> > > Eigerstein_img_eigerstien.exe 2.2.16 Kernel. I have read some of the
> > > documentation. I dont really understand it. I would like some advice on
> > > what direction to go. Should I use static floating routes or do I need to
> > > install an aditional module on my LEAF disk. I can do basic stuff like
> > > install modules and nic drivers. I dont need firewall support, so I think
> > > all I have to do is change that line in network.conf IPFILTER_SWITCH to
> > > =none. Not sure what else I need to do.
> > >
> > > Thanks for the help,
> > > David
> > >
> > > _______________________________________________
> > > Leaf-user mailing list
> > > [EMAIL PROTECTED]
> > > https://lists.sourceforge.net/lists/listinfo/leaf-user
> > >
> >
> > Static floating routes is the closest you'll get to what you want -- if
> > you direct some of your internal machines to one path and some of them
> > to the other.
> >
> >
>
>
--
Jack Coates
Monkeynoodle: A Scientific Venture...
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