From: "Lloyd Standish" <lloyd@crnatural.net>
To: "Usuário do Sistema" <maiconlp@ig.com.br>,
"Gáspár Lajos" <swifty@freemail.hu>
Cc: Andrew Beverley <andy@andybev.com>,
Mail List - Netfilter <netfilter@vger.kernel.org>
Subject: Re: redundancy with Adsl modem
Date: Fri, 06 Jan 2012 12:16:39 -0600 [thread overview]
Message-ID: <op.v7oc11lrx1lyi3@debiandesk2.net> (raw)
In-Reply-To: <4F072B63.7060609@freemail.hu>
On Fri, 06 Jan 2012 11:12:03 -0600, Gáspár Lajos <swifty@freemail.hu> wrote:
> If the line goes down between step 2 and step 3 then the reply packet will never get back to B1 and A (because the line is down) !!!
> If the line goes down after step 4 then you can send it out on the second extrenal IP (B2 - 2.2.2.2) but C will see it as a NEW connection !!!
>So I think that your request is impossible on IP level.
> However you can use a proxy or a mail server, etc. etc. etc.
I think any sort of "uplink redundancy" such as "Usuario de Sistema" is looking for must be on the connection level, unless one is connecting to a server using some sort of link bonding or multilink protocol, which has to be supported on the gateway computer. I have never done that.
My suggestions to Usuario for uplink redundancy assume that if an interface/uplink goes down, the connection *will* be broken, but any following connections will avoid the failed interface/uplink. I think that is the best that can usually be done to provide Internet connection redundancy. In my scenario, load-balancing is also performed by selecting the interface for NEW connection from the LAN to Internet at random.
--
Lloyd
next prev parent reply other threads:[~2012-01-06 18:16 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-03 1:54 redundancy with Adsl modem Usuário do Sistema
2012-01-03 7:14 ` Andrew Beverley
2012-01-03 15:18 ` Usuário do Sistema
2012-01-03 23:58 ` Andrew Beverley
2012-01-04 0:17 ` Usuário do Sistema
2012-01-04 1:58 ` Lloyd Standish
2012-01-04 9:09 ` Gáspár Lajos
2012-01-04 11:16 ` Usuário do Sistema
2012-01-04 14:08 ` Lloyd Standish
2012-01-04 18:00 ` Gáspár Lajos
2012-01-04 20:15 ` Usuário do Sistema
2012-01-04 20:55 ` Lloyd Standish
2012-01-06 17:12 ` Gáspár Lajos
2012-01-06 18:16 ` Lloyd Standish [this message]
2012-01-10 0:20 ` Usuário do Sistema
2012-01-17 16:09 ` Gáspár Lajos
2012-01-17 17:08 ` Usuário do Sistema
2012-01-04 20:55 ` Lloyd Standish
2012-01-04 21:01 ` Lloyd Standish
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