Multiple gateways

[Jeniffer K]

Dear NG,

We have two internet connections, cable and DSL as a backup, we would like
to start hosting our own exchange server, the exchange server is a DC with
two nics and gateway'ing to the cable, we don't feel like hosting exchange
over cable because we cant get a static ip so we decided to use the second
nic with the DSL where we have a block of 5 usable IP's, my question is will
I have an issue if I register two ip's to the DNS considering that its a DC?
what will become the default route considering that I want to keep cable as
the default route? will exchange always route the DSL? here is an example on
how I plan do this...

NIC 1 - Currently registered with DNS
IP = 192.168.10.200 - Nat'ed behind the cable router
SM = 255.255.255.0
GW= 192.168.10.1
DNS= 192.168.10.200

NIC 2 - Currently not used
IP = 192.168.20.200 - Nat'ed behind the DSL router
SM = 255.255.255.0
GW = 192.168.20.1
DNS = 192.168.20.200

SMTP will be configured to listen to All Assigned ip's

is this ok?

Thanks for your help

 

[Bill Grant]

This sounds a pretty bad idea all round. Here are just a few of the
problems.

1. You cannot have two active default routes on a machine, no matter how
many NICs it has. The default route should point to the active Internet
router.

2. Having a multihomed DC causes all sorts of odd problems with name
resolution and browsing. It can be made to work (as in sbs server) but it is
not recommended.

 

[Jeniffer K]

any recommendations?

This sounds a pretty bad idea all round. Here are just a few of the
problems.

1. You cannot have two active default routes on a machine, no matter how
many NICs it has. The default route should point to the active Internet
router.

2. Having a multihomed DC causes all sorts of odd problems with name
resolution and browsing. It can be made to work (as in sbs server) but it
is not recommended.

 

[Jeniffer K]

Bill, have a look at Jaap de Koning's response in the networking group, i
didnt mean to multi post but i posted to RAS group by mistake

<[email protected]>

 

[Bill Grant]

You could stay with one NIC in the server, but set it to use a different
default gateway from the workstations.