[18841] in North American Network Operators' Group
Re: intranet
daemon@ATHENA.MIT.EDU (Chris Gibiault)
Tue Aug 18 22:36:03 1998
Date: Tue, 18 Aug 1998 22:28:04 -0400
To: william@pacific.net.ph, nanog@merit.edu, nanog-outgoing@merit.edu
From: Chris Gibiault <gibiault@linet07.li.net>
Well ..
That is one way to do it .. another and I think a BETTER way would be to
only use 1 set of ip's ( a set that is "portable" ) and talk bgp with both
providers. This way you can move the traffic in the most efficient way . If
you take routes from both of em you may get a better path to site X from
provider a and a better path to site Y from provider B .
This way if provider a goes down the BGP will move trafic of the link that
is still "GOOD"
What do the rest of ya think
-Chris
At 05:43 PM 8/18/98 +0800, william@pacific.net.ph wrote:
>
>Hi all!
>
>Just wondering if the following is possible:
>
>
>Situation:
>
>Corporate intranet is currently connected to 2 separate ISPs using 2
>different set of IP addresses. When one is down, the network has to be
>reconfigured for access via the 2nd ISP.
>
>
>Required Result:
>
>Corporate intranet connects to 2 ISPs. When one is down or unavailable,
>traffic will automatically shift to the other connection. DNS server and
>mail server remains inside the intranet. The DNS and mail servers should
>not be reconfigured during any problems and should keep on working.
>
>
>Proposed Solution:
>
>The 7010 router will be connected to the 2 ISPs. The 7010 will be upgraded
>to an IOS that supports NAT; all IP address behind the 7010 will be treated
>as internal IP addresses (to reduce reconfiguration). IP address subnets
>from both ISPs will be NAT-mapped to internal IP addresses over the 7010,
>including the DNS server and the mail server.
>
>The DNS will be configured to use their DNS as the primary name server.
>The 2 ISPs' name servers will be used as secondary name servers.
>
>The mail server will be configured to have 2 IP address, one actual and one
>virtual IP address using the network card. The DNS will have an MX 10 and
>an MX 20, each pointing to one IP addresses for the network card.
>
>
>Is this solution possible? Will it work? Did I forget anything? Any tips?
>
>
>William
>
>
>
Christopher Gibiault
LI.Net / Verio LongIsland
(516) 265-0997 x 226
