RE: smtp issue - Anyone?
- From: "Bryan Andrews" <bandrews@xxxxxxxxxxxxxxxxxx>
- To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
- Date: Thu, 9 May 2002 22:26:09 -0400
I really hope this is not true... I have several different domains we
are hosting mail for and they are all apparently sending mail thru the
same IP.
This means they are advertising themselves as one domain and appearing
as another on a reverse lookup (as far as I can tell)... I can't
understand why all our mail is not breaking though...
-----Original Message-----
From: Marty Richards [mailto:marty@xxxxxxxxxxxxxxxxxxxxx]
Sent: Thursday, May 09, 2002 9:03 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: smtp issue - Anyone?
http://www.ISAserver.org
imho, this is a normal problem for multi-homed boxes. (multi-homed being
multiple IP addresses on one or more cards).
When a multi-homed box sends something, it defaults to using its primary
IP
for that interface.
This causes all manner of problems, particularly in a multipath
environment
or otherwise complex/secure setup where things like VPN, ftp,
masquerading
and even ping can break.
One solution in unix-land uses source-routing. I don't know of similar
solutions for Windows, except to only use one interface... This issue
always
makes me wonder if Microsoft really understands networking at all.
Cheers,
Marty
> -----Original Message-----
> From: Bryan Andrews [mailto:bandrews@xxxxxxxxxxxxxxxxxx]
> Sent: Friday, May 10, 2002 10:45 AM
> To: [ISAserver.org Discussion List]
> Subject: [isalist] RE: smtp issue - Anyone?
>
>
> http://www.ISAserver.org
>
>
> Thomas or Jim (or anyone else that may know),
>
> Do you think this is by design (do your installs display this
> behavior)?
>
> This does not seem correct.
>
>
> -----Original Message-----
> From: Bryan Andrews
> Sent: Thursday, May 09, 2002 4:23 PM
> To: [ISAserver.org Discussion List]
> Subject: [isalist] RE: smtp issue - Anyone?
>
> http://www.ISAserver.org
>
>
> Really strange as it looks like our exchange server is
> sending out thru
> that ip as well.
>
> This is worrying me... I don't remember this being like this... could
> this have changed with sp1?
>
>
> -----Original Message-----
> From: Aaron Spurlock [mailto:aarons@xxxxxxxxxxxxxxxxxxxxxx]
> Sent: Thursday, May 09, 2002 3:58 PM
> To: [ISAserver.org Discussion List]
> Subject: [isalist] RE: smtp issue - Anyone?
>
> http://www.ISAserver.org
>
>
> Interesting question....one I've never poked into much, but I
> do notice
> the same behavior. I have my main IP as 177, but my mail server is
> published on 130. Any outbound email appears to come from 177 though.
> My guess is that all outbound traffic originates from the "main" ip
> address of the server.
>
> Sorry I'm not more help, but I at least wanted to validate
> what you have
> seen.
>
> -----Original Message-----
> From: Bryan Andrews [mailto:bandrews@xxxxxxxxxxxxxxxxxx]
> Sent: Thursday, May 09, 2002 12:43 PM
> To: [ISAserver.org Discussion List]
> Subject: [isalist] RE: smtp issue - Anyone?
>
>
> http://www.ISAserver.org
>
>
> No thoughts on this? Has anyone else seen this behavior from an SMTP
> server published behind their ISA?
>
>
> -----Original Message-----
> From: Bryan Andrews
> Sent: Wednesday, May 08, 2002 6:14 PM
> To: [ISAserver.org Discussion List]
> Subject: [isalist] smtp issue
>
> http://www.ISAserver.org
>
>
> Hi,
>
> I have my isa server publishing an smtp server with an
> external address
> of x.x.x.153
>
> My ISA server default ip is x.x.x.130
>
> My PTR record pointing to my mail server is x.x.x.153
>
> Why when I receive emails to an external account, do I see the ip
> x.x.x.130 in the header info?
>
> This scares me as it seems it could cause problems... I am looking at
> the header granted in the options in outlook, so it could be leaving
> some interaction between the mail servers out...
>
> Any thoughts on why this would occur?
>
>
>
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