fuel-dev team mailing list archive

[Andrew Woodward <xarses@xxxxxxxxx>]

As in the examples, the packets are arriving on the interface(s) with out
the default route, and returning on the interface with the default route.
Adding a specific route on both nodes to use the correct interface results
in packets traversing from admin to admin or mgmt to mgmt as expected. With
out these routes the packets are simply being discarded


On Sat, Jan 25, 2014 at 12:27 AM, Matthew Mosesohn
<mmosesohn@xxxxxxxxxxxx>wrote:

> One explanation I can think of is you are trying to reach another node
> via mgmt net, but it gets sent from the admin interface. The response
> comes back to the wrong NIC and gets dropped.
> To be sure routing itself is working, try ping -I $interface $dest
> from each interface and see where the breakdown occurs. Since you're
> testing multiple L3 networks, I'm curious to know if the same router
> NIC is handling all networks for a particular L3 segment with VLANs to
> split up the logical networks.
>
> On Sat, Jan 25, 2014 at 12:01 PM, Andrew Woodward
> <awoodward@xxxxxxxxxxxx> wrote:
> > During our ml3 testing today, we found that we will need set multiple
> routes
> > into the nodes in order to get them to return packets over the
> appropriate
> > interfaces. ie, received traffic comes in one interface and returns over
> the
> > default route and creates async routing, which results in dropped
> responses.
> >
> > I think that setting up separate route tables with default routes in 'ip
> > route' as in [1] or [2] may be the best solution forward. Although
> possibly
> > less useful implementations include setting up static routes for peer
> > networks, or using a routing protocol to learn routes on each interface.
> >
> > I'd like some help on possibly implementing one of these methods. Does
> any
> > one know of any puppet providers or the like that can stand this up in a
> > automated way?
> >
> > [1]
> http://serverfault.com/questions/228195/answering-on-the-same-interface-where-the-request-came-from
> > [2]
> http://superuser.com/questions/325128/how-can-i-ensure-outbound-traffic-uses-the-same-interface-as-that-of-inbound-tra
> >
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