Date: Mon, 22 Feb 2010 20:10:44 -0500 From: Steve Bertrand <steve@ibctech.ca> To: Christian Ullrich <chris@chrullrich.net> Cc: freebsd-net@freebsd.org Subject: Re: Routing into overlapping subnets Message-ID: <4B832B14.3090406@ibctech.ca> In-Reply-To: <4B7CD0CB.4080105@chrullrich.net> References: <4B7C62AF.6000904@chrullrich.net> <4B7CA72A.4050202@ibctech.ca> <4B7CD0CB.4080105@chrullrich.net>
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On 2010.02.18 00:31, Christian Ullrich wrote: > * Steve Bertrand wrote: > >> On 2010.02.17 16:42, Christian Ullrich wrote: > >>> send the packet. Why doesn't the kernel look up an ARP table entry by >>> both IP address and interface? >> >> That's not how the protocols were designed, and thankfully so. Imagine >> the potential for spoofing if this were allowed by default ;) > > You're right, of course. I had not considered that. > >> I have a couple of ideas, but need to understand better of your setup. >> Advise if this seems semi-accurate: >> >> - you house global resources for a bunch of clients at a central location >> - you have limited public IP addresses to do this with, or your central >> location is located within the same 'building' as all of the clients > > The latter. > >> - you have several clients with overlapping 1918 space >> - you need a method to have two instances of eg 192.168.1.110 accessing >> a single central resource, but which will be coming in on two separate >> interfaces (physical or virtual) >> - the central services (ie printer) doesn't have the capability to house >> more than a single IPv4 address >> - you do not want to be open to the potential for one client accessing >> the others networks >> - you have absolute control over the pf box >> >> is this right? > > Exactly right. Contact me off-list, and I'll see if I can help with either cleaning this up, or with a dirty hack. We'll post any positive results to the list. Steve
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