My opinion would be that best case calls for you to use your own netblock.
Get 2 /24's and since you are running with 2 ISPs (multi-homed) you need
your own AS. Using 2 routers on your prem and BGP with the ISPs affords you
a lot of flexibility. If you only have 1 /24 then its pretty much up to the
how the Internet sees your routes as far as which one will be used to get to
your site. With 2 /24's you can really start achieving load-sharing (not
necessarily load-balancing) Talk with the ISPs and find out what policies
they will allow you to pass to them. You could route some traffic via one
provider and the rest through the other provider. If they accept manipulated
routes (such as AS PATH PREPEND) you could then allow each ISP to back the
other one up, and they don't really need to know or care. Advertise your
whole network to both, but adjusting the routes so that half takes one ISP
while the other half takes the other ISP. Then, upon failure of one ISP, the
other would then be advertising the best/only route for your traffic. This
takes a little time to consider and hopefully knowledgeable ISP installation
techs. This also takes some consideration on your part in respect to your
host numbering and usage.
HTH
Christopher A. Kane, CCNP/CCDA
Router Ops Center/Hilliard NOC
UUNET/WCOM
-----Original Message-----
From: Daniel Wilson [mailto:[EMAIL PROTECTED]]
Sent: Friday, June 08, 2001 7:43 AM
To: [EMAIL PROTECTED]
Subject: Re: BGP for 2 T1's to one LAN [7:7511]
Thanks. Someone else also mentioned the need for 2 routers for full
redundancy. What
I'm not understanding is why we need to IP blocks to achieve loadbalancing.
That we'd
need DNS round robin if we're running 2 blocks makes sense, but why the 2
blocks? Also,
are both your lists assuming that the ISPs run BGP with us?
Thanks for the help.
--
Daniel Wilson, BSCS, MCP
Application Developer
http://www.compusoftsolutions.com/
"Sergei G." wrote:
> Redundancy and loadbalancing are possible. The hardware is insufficient,
> though.
>
> Redundcy and Load balancing requirements.
> --
> 2 ISPs
> 2 /24
> ASN
> Two routers capable of 256 Mb of DRAM (3600 and higher)
> web servers with two IPs, from each block
> DNS round robin
>
> Redundancy only
> --
> 2 ISPs
> 1 /24
> ASN
> Two routers capable of 256 Mb of DRAM (3600 and higher)
>
> --
> Sergei G""Daniel Wilson"" wrote in message
> [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > We are trying to have the web servers in our LAN accessible to the
> > internet via 2 T1's from different providers -- more for redundancy than
> >
> > load sharing, though that matters too. Currently we have 2 T1's, each
> > giving us a different set of IP addresses. That just lets us put some
> > sites on each T1 -- doesn't give us an ounce of redundancy.
> >
> > I've been told that if we get a router with 2 WIC's that can speak BGP
> > (Cisco 2600 or better) that may solve our problem. I'm very new to
> > routing, so can someone answer some basic questions?
> >
> > Is the idea with this solution that we will be running just one set of
> > IP addresses? And that, because of BGP on our router, either ISP will
> > be able to route traffic to that set of IPs on the T1 it provides?
> >
> > Thanks in advance.
> >
> > --
> > Daniel Wilson, BSCS, MCP
> > Application Developer
> > http://www.compusoftsolutions.com/
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=7713&t=7511
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