[Cialug] multi-homed apache ssl

[Dave Weis]

All of your upstreams advertise to their upstreams that your block is reachable through them. The data gets propagated to other providers. Their router has a list of all subnets and how they can be reached. When one of your connections go down, that upstream withdraws the route upward. Everyone else on the internet sees that and uses a different path to you. 

Most providers will ignore blocks smaller than a /23 or /24 to keep memory usage down on their routers. 

Dave




----- Original Message -----
From: cialug-bounces at cialug.org <cialug-bounces at cialug.org>
To: Central Iowa Linux Users Group <cialug at cialug.org>
Sent: Thu Nov 10 12:58:52 2011
Subject: Re: [Cialug] multi-homed apache ssl

Ok..so humor me for a second. If www.mydomain.com points to
65.121.150.20 and that connection fails, how does does traffic for
www.mydomain.com get routed to the webserver?

:) Dave

On Thu, 2011-11-10 at 12:51 -0600, Dave Weis wrote:
> It does work magically but you need to have a direct allocation from arin that both providers advertise. 
> 
> 
> ----- Original Message -----
> From: cialug-bounces at cialug.org <cialug-bounces at cialug.org>
> To: Cialug <cialug at cialug.org>
> Sent: Thu Nov 10 12:49:25 2011
> Subject: [Cialug] multi-homed apache ssl
> 
> Suppose you have a router that supports BGP,  You have an internet
> connection from provider 1 and provider 2.  Your peered with provider 1
> and provider 2. You have a block of static ip addresses from each one.
> You have a single domain, and a bunch of secure websites. How would you
> configure apache so that when the connection from provider 1 dies, it
> automatically fails over to provider 2? I'm assuming that BGP isn't just
> going to make it work majically, right?
> 
> :) Dave
> 
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