Re: [LARTC] Starting from scratch w/ multiple uplinks

[Alexander Samad <alex@samad.com.au>]

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On Tue, May 10, 2005 at 01:02:20PM +0200, Markus Feilner wrote:
> Am Montag, 9. Mai 2005 17:58 schrieb Sylvain BERTRAND:
> > On Lun 9 mai 2005 17:14, Rafael A Barrero a ?crit :
> > > Hey;
> > >
> > > I guess I should have included that aspect : what I want to
> > > achieve.
> > >
> > > I'd ideally like to use the new (faster line) as the default line
> > > for traffic, but be able to use the old line just as often
> > > depending on usage of the new line. However, it wouldn't matter if
> > > traffic routed randomly either. If one of the two lines is down,
> > > obviously use the one that is up.
> >
> > Iproute allows you to route packets according to their iptable's MARK
> > field... you can randomly mark packets from new connections (with the
> > appropriate ratio for each link), and route on this criterion.
> >
> > You should have a script in /etc/ppp/if{up,down}.d/ that changes the
> > routes if one link goes {up,down}.
> 
> ACK. But how do you do the checking, if the link is down?
> Especially if you have a dsl router in a ethernet subnet.
> My subnet consists of three hosts, two of them are bintec routers who do 
> the dsl stuff. They are reachable, even if the DSL Line is gone.
> How would U check that?

I run pppoe on the box so have control over the session or run a ping
out side, but my guess is that the linux box will dead route the route
when the adsl send back an icmp net unreachable

> 
> >
> > > I just want to get the most out of both lines at the same time. My
> > > internal network has two services (http, imap) that need require
> > > port- forwarding from the router. Other than that the internal
> > > network is used for surfing the web, ssh, ftp, irc, p2p cients.
> >
> > Your services can listen on both interfaces, no problem with that...
> > you can have load balancing on those links with multiple DNS records
> > (though that's not a "good thing" (tm).
> >
> > Use the iptables MARK to use both at the same time, and the
> > appropriate iproute setup.
> >
> > > What about my questions regarding updated documentation for
> > > iproute2 (setting this all up)?
> >
> > I think the contents of LARTC are enough material for you (and of
> > course, man iproute, man iptables).
> >
> Of course, but there is a need for some comprehensive, easy to 
> understand HOWTO for non-techies... I guess.
> Especially when it comes to tc and tcng...
> 
> 
> >
> > For the record, I've never actually done this kind of setup, I'm just
> > thinking of what should be done to achieve those things. Somebody
> > correct me if this is just nonsense.
> >
> > Regards,
> >
> > Sylvain
> >
> > _______________________________________________
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> > LARTC@mailman.ds9a.nl
> > http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc
> 
> -- 
> Mit freundlichen Gr??en
> Markus Feilner
> ---------------------------
> Feilner IT Linux & GIS 
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