My planned work on networking stack
haesu at towardex.com
Mon Mar 8 15:32:31 PST 2004
one feedback I can provide to this patch...
under [any] interface checks (the loose check mode), if the route
is pointed toward a discard interface (e.g. ds0 in freebsd, Null0 in cisco),
drop the packet.
under cisco, route pointed to null0 creates a null adjacency, even under
loose-check mode, causing cef to drop the packets originated with source
of the said route.
On Fri, Mar 05, 2004 at 10:31:35PM +0100, Andre Oppermann wrote:
> Andre Oppermann wrote:
> > > there are still other things freebsd lacks. such as uRPF that _SERVICE_PROVIDER_
> > > can use. ipfw2 has verrevpath but all it does from what i know is strict uRPF
> > > only. service providers like myself, if we were to use freebsd boxen to run our
> > > network, i am not spending money on a router that doesn't do loose-check uRPF.
> > > this sounds like something linux does too but i refuse to use that :P
> > That is pretty easy to implement. I should have it by Friday at latest,
> > depends on when exactly I find time for it.
> > ip verify unicast source reachable-via [any|ifn]
> > The ipfw2 command would look like this: ... versrcreach [fxp0]
> Here you go:
> This one implements the standard functionality, the definition of an
> interface through which it has to be reachable is not (yet) supported.
> Using this option only makes sense when you don't have a default route
> which naturally always matches. So this is useful for machines acting
> as routers with a default-free view of the entire Internet as common
> when running a BGP daemon (Zebra/Quagga or OpenBSD bgpd).
> One useful way of enabling it globally on a router looks like this:
> ipfw add xxxx deny ip from any to any not versrcreach
> or for an individual interface only:
> ipfw add xxxx deny ip from any to any not versrcreach recv fxp0
> I'd like to get some feedback (and a man page draft) before I commit it
> to -CURRENT.
James Jun TowardEX Technologies, Inc.
Technical Lead Network Design, Consulting, IT Outsourcing
james at towardex.com Boston-based Colocation & Bandwidth Services
cell: 1(978)-394-2867 web: http://www.towardex.com , noc: www.twdx.net
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