On Fri, 13 Jul 2001, Mark Seiden wrote:
> okay, by 1. having multiple ip addresses on each isp, 2. advertising
> via dns multiple round-robin a records for www and multiple mx
> records for mail 3. switching your default route away from failed
> paths 4. using dynamic dns (taking unreachable interfaces out of the
> sequence as quickly as possible) you can accomplish some sort of
> diversity.
>
> i would hope 4 is less necessary, because clients should know how
> to handle multiple A records returned, and connect to the second
> if the first fails (albeit, with a delay for the failed connect).
>
Oops - hit CTRL-J in your list and mangled it.
4 also takes up to 24 hours to propagate, which isn't what most people
have in mind when they say failover :-)
> i'll look for the load-balancing thread, but several related questions:
>
> what operating systems (besides cisco ios) support multiple default
> routes with different metrics? so traffic could use the cheapest route
> out, but come in via dns-selected ip addresses? (and so that load balancing
> could be accomplished) (and so that failover default routing is automatic)
>
I think BSD can do this, but I haven't tested it yet (I hope to get to
Fry's tonight for an OpenBSD CD). If you have two LRP boxes (one per
external interface) then you can fake the same effect with hopcounts --
see http://leaf.sourceforge.net/stinkingpig for details.
> is there any way to send stuff which comes into a specific IP address
> out via a specific route? (other than your QoS tagging, which
> i don't quite understand -- i don't understand where the QoS tagging
> takes place, and how an outgoing response is assigned the same QoS
> as the incoming request).
>
You can route traffic based on the IP address it's going to, but not on
the IP address it's coming from. However, you can deny and allow traffic
with firewall rules based on source and destination.
> anyone know of a good tutorial on QoS?
I wouldn't call it very good, but what I have is at
http://leaf.sourceforge.net/stinkingpig. The QoS document has links to
better resources (specifically snafu.org).
>
> also, charles suggests that using a different masquerade address
> as your source address will solve some problems. i don't understand
> how that works when you still have a single default route.
>
> On Fri, Jul 13, 2001 at 07:36:05AM -0700, Jack Coates wrote:
> > On Thu, 12 Jul 2001, John P wrote:
> >
> > > Hi all,
> > >
> > > I know there's been lots of discussion about 'load balancing' in the past,
> > > over two similar link types.
> > >
> > > I want to do something a little different but in the same vein. Our company
> > > currently has a 2mb ADSL line, and for the most part it works great.
> > > However, we might be taking on a leased line in the future, as we have a
> > > mailserver/transaction server that we would like to ensure is always online.
> > > (Always is a relative term, of course, compared to the DSL!). This will
> > > probably only be 64k though.
> > >
> > > Anyway, what I would like to do is ensure all WWW/outgoing mail/downloads et
> > > al goes over the 2mb line (fast, no bandwidth charges!) but the 'important'
> > > traffic (incoming mail, incoming www requests) goes over the leased line.
> > > Also if the DSL line fails, everything needs to go over the leased line.
> > >
> > > Is it possible with LEAF? Where to start looking?
> > >
> > > Cheers
> > > John
> > >
> > > --
> > > John Portwin
> > >
> > >
> >
> > If you can separate traffic type by IP address, then yes -- these are
> > possible. However, LRP does not currently have the ability to route
> > based on tags. In other words, we can use the QoS tools to tag traffic
> > types, but we can't then say "tag 1 uses x.x.x.x for its default
> > gateway, and everything else uses y.y.y.y". Supposedly this is being
> > worked on, but I think the work is only being done in the 2.4 tree
> > (which won't be realistic on LRP for a while).
> >
> > I've been trying to do the same thing for a while now, and it looks like
> > OpenBSD will be able to do it -- I'll try to post to this list if I have
> > success.
> >
> > --
> > Jack Coates
> > Monkeynoodle: It's what's for dinner!
> >
> >
> > _______________________________________________
> > Leaf-user mailing list
> > [EMAIL PROTECTED]
> > http://lists.sourceforge.net/lists/listinfo/leaf-user
>
>
--
Jack Coates
Monkeynoodle: It's what's for dinner!
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