Re: Howto make ISA server a VPN client
- From: "Steve Moffat" <steve@xxxxxxxxxxxxxxx>
- To: "Isa List" <isalist@xxxxxxxxxxxxx>
- Date: Mon, 24 Mar 2003 22:42:41 -0000
Hi Mark
If, in the middle of your ETRN command you lose the dial up, you would
lose connection to your ISP. You would then have to reconnect and start
the process all over again. You would then have a different ip address.
No different from DDNS.
If you use DDNS, when the reconnect is made the DNS change is almost
instantaneous.
1.) yes you would have a new ip address.
2.) It would still resolve to the DDNS name you decide to use.
3.) If by some small miniscule chance the ISP's mail server still sent
mail out to the original ip address then there would have to be a server
on that address, and it would have to be set up to receive mail for your
domain.
DDNS IS the way to go.
Steve
-----Original Message-----
From: Mark Hippenstiel [mailto:m.hippenstiel@xxxxxxxxxxxx]
Sent: Monday, March 24, 2003 3:37 PM
To: Isa List
Subject: [isalist] Re: Howto make ISA server a VPN client
http://www.ISAserver.org
Sure it's not that important. I would agree with you 100% was it not for
ETRN being not a command that opens a conversation, than rather
triggering a connection that is made from the external mail server to my
ip address, no matter how this is obtained. Neither in the specs nor in
real life is there a guarantee that the server gets back to me
immediately. In the meantime, I might have changed my ip address. If
that's not a problem for you, well for me it is.
I'm back to my studies :)
Mark
> -----Original Message-----
> From: Jim Harrison [mailto:jim@xxxxxxxxxxxx]
> Sent: Monday, March 24, 2003 8:24 PM
> To: [ISAserver.org Discussion List]
> Subject: [isalist] Re: Howto make ISA server a VPN client
>
>
> http://www.ISAserver.org
>
>
> What happens when the dialup link dies is the equivalent of any
> network outage during a conversation; the TCP/IP stack and the
> application have to handle it. DDNS is a different question
> altogether; it's what allows external server to connect to you; it
> doesn't bear on your connection to them unless they're performing
> reverse name resolution. If your email is readable at all, it's
> already been read by the time your ISP gets it. What happens
> between you and your ISP is about as private as you can get,
> compared to what the rest of the Internet.
>
> If your mail is that important, encrypt the mail, not the traffic
> channel.
>
> Jim Harrison [ISAQFE]
> Read the help, books and articles!
>
> This posting is provided "AS IS" with no warranties, and confers no
> rights.
>
> ----- Original Message -----
> From: "Mark Hippenstiel" <m.hippenstiel@xxxxxxxxxxxx>
> To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
> Sent: Monday, March 24, 2003 10:33
> Subject: [isalist] Re: Howto make ISA server a VPN client
>
>
> http://www.ISAserver.org
>
>
> Anyway, just inbetween,
> there is alway the possibility that my exchange server sends an ETRN
> and the dialup link goes offline for some reason - DDNS wouldn't be
> aware of that fact. In the meantime, another computer might get my
> former IP adress and the remote mail server would try to deliver the
> queue to that computer. It's only a little chance that this happens,
> but it bears some risk. I wouldn't want my mails to be read by some
> unknown person.
>
> Mark
>
>
>
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> ------------------------------------------------------
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