CARP and NAT question

[Julien Cigar]

On Tue, Oct 08, 2019 at 11:22:51AM -0500, Matthew Grooms wrote:
> On 10/8/2019 10:58 AM, Julien Cigar wrote:
> > On Tue, Oct 08, 2019 at 10:20:34AM -0500, Matthew Grooms wrote:
> >> Hi Julien,
> > Hi Matthew,
> >
> >> It's not clear why you are trying to assign multiple carp IP address to
> >> two different interfaces from within the same IP subnet. Are you trying
> >> to fail over a 2nd carp address or are you trying to improve
> >> throughput/redundancy? If you just want to fail over a 2nd carp address,
> >> assign a 2nd alias to your first interface. If your trying to improve
> >> throughput/redundancy, assign both interfaces to a lagg and build your
> >> carp interfaces on top of that instead.
> >>
> > Currently outbound traffic from $net1 and $net2 (two private networks)
> > pass through the same network interface (igb0) (as you can see in (1)
> > in my previous post) on the router. I'd like to prevent that
> > $net2 saturates the interface and slow down traffic from $net1 (which is
> > more important). I could lagg and build CARP on top of that but it
> > wouldn't prevent $net2 to saturate the interface (unless I'm plugin ALTQ
> > of course, which I'd like to avoid).
> 
> Well, I'm not sure how well it will work but I think what you are 
> looking for is the route-to pf rule option. You can specify that certain 
> traffic be transmitted via a specific network interface to a specific 
> next hop. However, I believe you'll need to match traffic as it's 
> received on the internal interface, ie. before the kernel determines the 
> egress interface.
> 
> table internal_networks { $net1, $net2 }
> pass in on $internal_interface route-to( igb0 $default_gw ) from $net1 
> to !<internal_networks>
> pass in on $internal_interface route-to( igb1 $default_gw ) from $net2 
> to !<internal_networks>

Thanks, I haven't used the route-to yet but if I understand well it's 
a way to "bypass" the default route/interface?

> 
> Hope this helps,
> 
> -Matthew
> 

-- 
Julien Cigar
Belgian Biodiversity Platform (http://www.biodiversity.be)
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