Re: Routing choice under user control per application instance?

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On Thu, 2010-03-18 at 14:07 -0600, S P Arif Sahari Wibowo wrote: 
> Hi!
> 
> I am wondering whether it is possible to choose TCP/IP routing 
> for a specific instance of an application - chosen on user-level 
> when the application is started?
> 
> More specifically I have a workstation with 2 Internet 
> connections (different devices), and I would like to have some 
> applications connecting to Internet using one connection while 
> other applications connecting to Internet using the other 
> connection, where I choose which application instance use which 
> connection.
> 
> I control the whole workstation (root, hardware) so I can do 
> whatever on the machine, but not the router / connection.
> 
> Any idea?

I have not done what you are requesting.

I did an Internet search and came to the following conclusions:
1) You can mark packets using iptables.
   The marking can be based on type of traffic, ex: html, smtp, etc.

2) You then use ip routing to do what is called policy routing.
   You have multiple routing tables.
   The routing table to be used will be selected based on the marking.

I will suggest you look at the following URL and see if it helps you.

This URL is not for the faint of heart:
http://linux-ip.net/html/adv-multi-internet.html

The key overview to understand this URL is the summary near the top:
Quoting from the URL,
"...Before beginning let's outline the process we are going to follow. 

      * Copy the main routing table to another routing table and set the
        alternate default route [38]. 
        
      * Use iptables/ipchains to mark traffic with fwmark. 
        
      * Add a rule to the routing policy database. 
        
      * Test!"

I have not personally done this.
I can't do much more than give you the URL reference.
You will need to determine if this as a possible solution for you.


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