Dynamic routing on firewalls.

Thu Feb 5 15:06:00 UTC 2015

Hi,

We are running Juniper SRX5000 family with around 40ish routing-instances,
most of them using OSPFv2 without any issues. The RIBs are not too big,
just a couple of them with thousands routes. I know that some guys are
testing a similar environment on Fortigates and I'm not aware of any issues
with routing so far.

We also have SRX's running BGP+BFD (srx240) and again no issues at all.

As Eugeniu mentioned, just be careful with the asymmetric routing, then is
straight forward.

Hope it helps.

Santiago

On Thu, Feb 5, 2015 at 2:42 PM, Eugeniu Patrascu <eugen at imacandi.net> wrote:

> On Thu, Feb 5, 2015 at 4:10 PM, David Jansen <david at nines.nl> wrote:
>
> > Hi,
> >
> > We have used dynamic routing on firewall in the old days. We did
> > experience several severe outages due to this setup (OSPF en Cisco). As
> you
> > will understand i’m not eager to go back to this solution but I am
> curious
> > about your point of views.
> >
> > Is it advisory to so these days?
> >
> >
> Any specific firewall in mind? As this depends from vendor to vendor.
>
> I've had some issues with OSPF and CheckPoint firewalls when the firewalls
> would be overloaded and started dropping packets at the interface level
> causing adjacencies to go down, but I solved this by using BGP instead and
> the routing issues went away.
>
> On Juniper things tend work OK.
>
> Other than this, make sure you don't run into asymmetric routing as
> connections might get dropped because the firewall does not know about them
> or packets arrive out of order and the firewall cannot reassemble all of
> them.
>