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

[Markus Feilner <lists@feilner-it.net>]

Am Dienstag, 10. Mai 2005 13:11 schrieb Sylvain BERTRAND:
> On Mar 10 mai 2005 13:02, Markus Feilner a écrit :
> > Am Montag, 9. Mai 2005 17:58 schrieb Sylvain BERTRAND:
> >> On Lun 9 mai 2005 17:14, Rafael A Barrero a écrit :
> >> > 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?
>
> Have a script running that checks connectivity by sending a ping
> 'outside'.
>
> >> > 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...
>
> If you want to setup this kind of redundancy, you *have* to
> understand techie stuff. Out-of-the-box solutions do exist, but
> they're expensive...
You are completely right.
But tc requires more than "techie stuff" to make it work.
There is no comprehensive docu around which could e.g. used for 
trainings.
this is especially because it's so powerful.

>
>
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-- 
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Markus Feilner
---------------------------
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