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On 03/03/14 17:18, Anthony Williams wrote: > On 03/03/14 16:44, bad apple wrote: >> On 03/03/14 09:49, Anthony Williams wrote: >> Well, you haven't said how much traffic or of what type you wish to >> proxy through Box C but the answer is still in this case OpenBSD with >> PF, although Linux + iptables can definitely also do the job, just not >> as elegantly or securely. > > TCP and UDP packets for a system-specific client-server protocol. Not > particularly large quantities as one of the ppp connections is a > telephone dial-up. > > What's PF? I have no experience with OpenBSD at all, whereas I use linux > all the time, and can configure straightforward iptables setups. > >> But having both lines as ppp and those two awkward sequential IPs are >> going to cause whatever solution to be non-trivial as it stands. > > Yes. That's why I'm asking here ;-) > > If it was a straightforward solution I could do it myself. > >> Changing at least one of the machine A or B's network configuration >> would be very helpful. This is like all those fun times when I go to >> drop a VPN in between a couple of sites and find out - surprise! - that >> of course all the LANs are 192.168.0.0/24. > > Yes, changing the network config at one end would make things much simpler. > > Anthony I thought about this a bit longer, because I'm sure I've had to do this exact thing before at some point... but it would have been a *long* time ago. BCP bridging is what you need, so make life easy for yourself and make sure that Box C is cheap second hand Cisco router that supports it. http://www.cisco.com/c/en/us/td/docs/ios/bridging/configuration/guide/15-s/br-15-s-book/br_bcp.html You'll have to grapple with IOS (the proper one, not the Apple one) a bit which can be a bit of a headache but it's going to be far easier and way more reliable than anything you have to hack together. Some googling about seems to indicate that BCP PPP bridging *may* be possible on a slightly more DIY basis with flashed commodity routers like the good old WRTG5* running Tomato or DD-WRT or whatever. *All* of the extant information about BCP bridging seems pretty out of date though, I guess very few people are needing to do what you're trying :] Regards -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/listfaq