Re: ARP

The situation is this:

Imail peer #1 sends a e-mail to Imail peer #2. It does this by sending it to
user1@xxxxxxxx ISA receives it as going to IP 1.1.1.3, knows this is
10.0.0.11 on the Internal network and sends it there. The Imail server at
10.0.0.11 is Imail peer #2. It receives it, says hey, I do not have a IP
address of 1.1.1.3 and rejects it.

The idea is to add the IP address 1.1.1.3 to the NIC of the Imail server
peer #2 in addition to 10.0.0.11 so that it will recognize that IP as one of
its valid IP address, match it to the alias that 1.1.1.3 is for domain1.com
and accept it and process it accordingly.

The question is if the IP 1.1.1.3 is added to the Imail server peer #2 on
the Internal network, will ISA become aware of it and therefore cause a
problem?

John Tolmachoff MCSE, CSSA
IT Manager, Network Engineer
RelianceSoft, Inc.
Fullerton, CA  92835
www.reliancesoft.com


> -----Original Message-----
> From: Thomas W Shinder [mailto:tshinder@xxxxxxxxxxxxxxxxxx]
> Sent: Sunday, March 02, 2003 6:12 PM
> To: [ISAserver.org Discussion List]
> Subject: [isalist] Re: ARP
> 
> http://www.ISAserver.org
> 
> 
> Hi John,
> 
> The Ethernet broadcast space is different from the routing issues. Sure,
> you can ARP and get the hardware address, but you'll need a route to get
> the packet to the right network ID, even if they're on the same physical
> network segment.
> 
> HTH,
> Tom
> 
> Thomas W Shinder
> www.isaserver.org/shinder
> ISA Server and Beyond: http://tinyurl.com/1jq1
> Configuring ISA Server: http://tinyurl.com/1llp
> 
> 
> 
> -----Original Message-----
> From: John Tolmachoff [mailto:isalist@xxxxxxxxxxxx]
> Sent: Saturday, March 01, 2003 11:01 AM
> To: [ISAserver.org Discussion List]
> Subject: [isalist] Re: ARP
> 
> 
> http://www.ISAserver.org
> 
> 
> If a e-mail server on the Internal network on private address has the
> public
> IP of that server added to the NIC for a peering resolution, will the
> ISA
> server on Windows 2000 ARP for all addresses and include that public
> address
> in its ARP Cache?
> 
> Example:
> 
> Public IP of ISA 1.1.1.2
> Internal IP of ISA 10.0.0.1
> Public e-mail server IP 1.1.1.3
> ISA setup to send 1.1.1.3 to 10.0.0.11
> Internal mail server 10.0.0.11
> 
> Also bind IP 1.1.1.3 to NIC of internal mail server so it will accept a
> peering e-mail addressed to user@xxxxxxx
> 
> ISA receives a packet destined for 1.1.1.3 and sends it to 10.0.0.11.
> The
> internal e-mail server NIC receives and passes it to the SMTP Engine.
> 
> John Tolmachoff MCSE, CSSA
> IT Manager, Network Engineer
> RelianceSoft, Inc.
> Fullerton, CA  92835
> www.reliancesoft.com
> 
> > -----Original Message-----
> > From: Jim Harrison [mailto:jim@xxxxxxxxxxxx]
> > Sent: Friday, February 28, 2003 5:37 PM
> > To: [ISAserver.org Discussion List]
> > Subject: [isalist] Re: ARP
> >
> > http://www.ISAserver.org
> >
> >
> > ISA doesn't, but Windows will.
> >
> >  Jim Harrison
> >  MCP(NT4, W2K), A+, Network+, PCG
> >  http://www.microsoft.com/isaserver
> >  http://isaserver.org/Jim_Harrison
> >  http://isatools.org
> >
> >  Read the help, books and articles!
> > ----- Original Message -----
> > From: "John Tolmachoff" <jtolmachoff@xxxxxxxxxxxxxxxx>
> > To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
> > Sent: Friday, February 28, 2003 14:54
> > Subject: [isalist] ARP
> >
> >
> > http://www.ISAserver.org
> >
> >
> > Does ISA ARP for all address on the internal network?
> >
> >
> >
> > John Tolmachoff MCSE, CSSA
> >
> > IT Manager, Network Engineer
> >
> > RelianceSoft, Inc.
> >
> > Fullerton, CA  92835
> >
> > www.reliancesoft.com
> >
> >
> >
> >
> >
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> > ISA Server FAQ: http://www.isaserver.org/pages/larticle.asp?type=FAQ
> > ------------------------------------------------------
> > Exchange Server Resource Site: http://www.msexchange.org/
> > Windows Security Resource Site: http://www.windowsecurity.com/
> > Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com
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> > ------------------------------------------------------
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> > Windows Security Resource Site: http://www.windowsecurity.com/
> > Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com
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> 
> ------------------------------------------------------
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> ISA Server FAQ: http://www.isaserver.org/pages/larticle.asp?type=FAQ
> ------------------------------------------------------
> Exchange Server Resource Site: http://www.msexchange.org/
> Windows Security Resource Site: http://www.windowsecurity.com/
> Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com
> ------------------------------------------------------
> You are currently subscribed to this ISAserver.org Discussion List as:
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> ISA Server FAQ: http://www.isaserver.org/pages/larticle.asp?type=FAQ
> ------------------------------------------------------
> Exchange Server Resource Site: http://www.msexchange.org/
> Windows Security Resource Site: http://www.windowsecurity.com/
> Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com
> ------------------------------------------------------
> You are currently subscribed to this ISAserver.org Discussion List as:
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