Multihoming IIS and gateway configuration

I want to have my IIS websites listening on two NICs. One NIC connected to
the primary T1 line (let's call it the "11" network), the other NIC
connected to the backup T1 line (the "22" network). I also have a third
NIC for the LAN for backups ("192" network).

In IIS I have my host headers set so they are listening on both IPs, i.e.:

www.mysite.com 11.0.0.11
www.mysite.com 22.0.0.22

The theory being if the primary T1 goes down for an extended period I can go
to the DNS server located elsewhere and change the "A" record to point to
the backup line.

On the primary NIC, for the 11.0.0.11 network I have the gateway set to it's
gateway device, 11.0.0.1

On the secondary NIC, for the 22.0.0.22 network I have the gateway set to
it's gateway device, 22.0.0.1

On the third NIC, for the 192 network, I have the gateway blank.

I remember reading somewhere that having two gateway IPs active at the same
time is a bad idea - not sure why - but how else can I have the two NICs
listening to the internet at the same time?

TIA,
Paul

Hi Paul,

Check this information about default Gateway,

The Cable Guy - September 2003 (Default Gateway Behavior for Windows TCP/IP)
http://www.microsoft.com/technet/com...uy/cg0903.mspx

http://www.microsoft.com/resources/d...ltGateways.asp

Default Gateway Configuration for Multihomed Computers
http://support.microsoft.com/default...b;en-us;157025

Multiple Default Gateways Can Cause Connectivity Problems
http://support.microsoft.com/default...b;EN-US;159168

I hope it helps,

Mike

"Paul" <(E-Mail Removed)> wrote in message
news:%(E-Mail Removed)...
>I want to have my IIS websites listening on two NICs. One NIC connected
>to the primary T1 line (let's call it the "11" network), the other NIC
>connected to the backup T1 line (the "22" network). I also have a third
>NIC for the LAN for backups ("192" network).
>
> In IIS I have my host headers set so they are listening on both IPs, i.e.:
>
> www.mysite.com 11.0.0.11
> www.mysite.com 22.0.0.22
>
> The theory being if the primary T1 goes down for an extended period I can
> go to the DNS server located elsewhere and change the "A" record to point
> to the backup line.
>
> On the primary NIC, for the 11.0.0.11 network I have the gateway set to
> it's gateway device, 11.0.0.1
>
> On the secondary NIC, for the 22.0.0.22 network I have the gateway set to
> it's gateway device, 22.0.0.1
>
> On the third NIC, for the 192 network, I have the gateway blank.
>
> I remember reading somewhere that having two gateway IPs active at the
> same time is a bad idea - not sure why - but how else can I have the two
> NICs listening to the internet at the same time?
>
> TIA,
> Paul
>
>