RE: smtp issue - Anyone?
- From: Marty Richards <marty@xxxxxxxxxxxxxxxxxxxxx>
- To: "'[ISAserver.org Discussion List]'" <isalist@xxxxxxxxxxxxx>
- Date: Fri, 10 May 2002 11:02:55 +1000
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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