thanks! rob
From: "Nicolas G" <[EMAIL PROTECTED]> Reply-To: [EMAIL PROTECTED] To: <[EMAIL PROTECTED]> Subject: RE: [IMail Forum] possible to NAT 2 public IPs to one private IP? Date: Wed, 3 Sep 2003 22:59:54 -0700
Very simple to answer this question.
Two routers, one for each External IP. Each router must have its own (different) internal ip. You set them up to forward the appropriate ports to the internal IP of the mail server.
2 Routers, A and B Mail Server, MS
Connection -> A -> MS -> A -> Internet Connection -> B -> MS -> B -> Internet
If the traffic comes in thru router A (old ip) then the traffic gets sent to the imail server, imail then sends it back to the router and the router sends it to the client. Same goes for B.
No need to worry about routing the traffic back or anything.
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Rod Dorman Sent: Wednesday, September 03, 2003 7:56 PM To: [EMAIL PROTECTED] Subject: Re: [IMail Forum] possible to NAT 2 public IPs to one private IP?
On Wednesday, September 3, 2003, 21:50:34, Rob A wrote: > This isn't exactly a specific IMail question. I'm switching ISPs and > since my Public IP address will change, I was wondering if there's a > way to minimize downtime due to DNS changes by having my old and new > Public IP NAT to a single private IP where IMail runs. I have an > internal router that can route between the two circuits:
> IMail (Priv. IP Z.Z.Z.Z) --- > | > Internal Router----New Router that does NAT----> New Public IP X.X.X.X > | > |--------------Old Router that does NAT----> Old Public IP Y.Y.Y.Y
> 1) Is it possible to have two public IPs NAT to a single private IP?
Yes.
> 2) How would packets get routed as they go out?
Depends on how you configure the routing tables on the Internal Router.
> I.E. should I just route everything to the New Router for outgoing > packets?
It will be the simplest thing to do (I'm assuming you're not running BGP or some other routing protocol). I would however route packets destined for your old ISPs network out the old router.
-- [EMAIL PROTECTED] "The avalanche has already started, it is too Rod Dorman late for the pebbles to vote." ? Ambassador Kosh
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