If I understand your question correctly, then you are going to have a
problem running BGP with your own Autonomous System while still using
leased address space from your ISP. Is this not true? In other words, the
problem you state cannot be fixed by either my solution or BGP. Do you
agree?
John Squeo
Technical Specialist
Papa John's Corporation
(502) 261-4035
"Tony
van
Ree" To: [EMAIL PROTECTED],
[EMAIL PROTECTED]
Subject: Re: Multihoming Without
BGP!!!!!....How
Posible???? Here's How
[7:20318]
09/18/01
06:25
PM
Hi,
Wouldn't this also depend largely on the routing etc from each of the
upstream providers. For example, if the address range used is within one
provided via the upstream provider it is likely the routes to others in
that upstream provider will only come via the link provided by the upstream
provider.
eg. (I know this example uses private space but it is just an example) You
are given a range say 172.16.20.0/23 by you provider. This fits in the
providers range of 172.16.0.0/16. The provider does not allow it's own
addresses in to its network via another provider (quite a normal
arrangement). It will not be possible then to access a number of sites.
Just a thought on something I have seen on a number of occasions. Maybe
you have an answer for this.
Teunis,
Hobart, Tasmania
Australia
On Tuesday, September 18, 2001 at 05:15:22 PM, [EMAIL PROTECTED]
wrote:
> If you do not want to go the complexity of running BGP and you still want
> to multihome your network to the Internet here's how to do it:
>
> Purchase and configure two egresses to the Internet via two different
ISPs.
> Say that both edge routers are Cisco 3640's and both have a Firewall, say
a
> Pix behind them for security.
>
> I emphasize that for this to work make sure both 3640s have at least two
> Ethernet or Fa ports each!
>
> Setup your default gateway on both 3640s to be each respective ISP next
> hop. Setup the default gateway of your Pix to its respective edge 3640
> router. Setup a vlan on a switch, do not make any routers aware of that
> vlan...its only a local broadcast domain...kind of like using a hub.
>
> Say your primary Ethernet interface on both edge routers is E0/0. Patch
> both E0/1 interfaces on each 3640 to your local vlan so that they can
> communicate, don't forget to no shut these interfaces of course.
Configure
> both E0/1 interfaces so that they are both in the same subnet, use a /30
> bit mask so that there is never a possiblity for IP overlap.....you may
> totally forget about these interfaces..I warn you..I have on my network ;
> -). Now configure HSRP on Both E0/0 interfaces with each other's E0/0 as
> the stanby IP address.
>
> Your done! If ISP 1 dies, HSRP will kick in and spoof the mac of your
> other 3640. All traffic that hits your edge router pointed toward the
dead
> ISP will be forwarded across your local vlan to your other ISP!
>
> This of course doesn't work if your are running a web server and you are
> NATing simultaneously like 99% of the world, however I have a workaround
> for that. Instead of registering with the A root DNS server the outside
IP
> address of your primary 3640 as the resolution to www.yourwebpage.com.
Pay
> a little extra for a fully meshed ISP to host a static page for you.
> Register this static page with Internic. Write the static page to do a
> JAVA redirection into your network. The ISP will have the headaches of
> running the BGP and even if their link to you fails, chances are that
your
> static page that they are hosting will still be veiwable to the Internet.
> Simply write your JAVA redirector to have your secondary 3640's outside
IP
> address as a mirror site for immediate redirection.
>
>
>
> John Squeo
> Technical Specialist
> Papa John's Corporation
> (502) 261-4035
--
www.tasmail.com
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