Re: Protocol level routing with ISA and multiple ISPs

  • From: "Stephen I. Woolhead" <Stephen.Woolhead@xxxxxxxxxxxxxxxxxxxxxxx>
  • To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
  • Date: Fri, 17 May 2002 17:45:32 +0100

I thought that was going to be the case.

Now, do I buy another ISA server, or do I give Smoothwall GPL a go,
seeing as this is only for outgoing web surfing for about 30 people.

Stephen.

> -----Original Message-----
> From: Jim Harrison [mailto:jim@xxxxxxxxxxxx]
> Sent: 17 May 2002 16:57
> To: [ISAserver.org Discussion List]
> Subject: [isalist] Re: Protocol level routing with ISA and multiple
ISPs
> 
> http://www.ISAserver.org
> 
> 
> ISA doesn't support multiple public interfaces.
> All you'll get for your trouble is a log full of "spoofed" packets.
> 
> Jim Harrison
> MCP(NT4, W2K), A+, Network+, PCG
> http://isaserver.org/authors/harrison/
> Read the books!
> ----- Original Message -----
> From: "Stephen I. Woolhead" <Stephen.Woolhead@xxxxxxxxxxxxxxxxxxxxxxx>
> To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
> Sent: Friday, May 17, 2002 8:35 AM
> Subject: [isalist] Protocol level routing with ISA and multiple ISPs
> 
> 
> http://www.ISAserver.org
> 
> 
> 
> I have an ISA server with two connections to the internet.  The first
is
> a leased line connection with an IP that our domain and MX records
> resolves to, the second is an ADSL connection.
> 
> Now what I want to do is set the ISA server up so that that I can have
> our mail and traffic for our web site be routed over the Leased line
and
> every thing else be routed over the ADSL line.
> 
> This translates into the following
> 
> Our MX records point at an IP address on the Leased Line.
> www.somedomain.com resolves to an IP address on the Leased Line.
> 
> ISA has server publishing rules for SMTP and Web publishing rules for
> www.somedomain.com.  That takes care of incoming traffic.
> 
> For outgoing traffic I want to force traffic from 192.168.1.100 ->
> 192.168.1.150 (the servers doing web and SMTP) to be routed over the
> Leased Line, but traffic from all other address to be sent over the
ADSL
> line.
> 
> How do I configure ISA/RRAS to do this?
> 
> Can I tell the machine to use a different gateway based on source
> address?
> 
> Is doing this by source address going to work if using ISA publishing,
> as the packets will get regenerated with ISA as the source, won't
they?
> 
> Is there a way to route by protocol?
> 
> Having got the above to work is there a way to get ISA to load balance
> over these two connections, or am I asking too much here?
> 
> Stephen.
> 
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