[CoLoCo] Multiple Network Interfaces, one card?

Fri Aug 31 16:39:20 BST 2007

The reason I want to do this is so that I can use two identities at
once on a wireless network; an anonymous one and a non-anonymous one.
On one interface (and therefore different IP/MAC) I have my
non-anonymous traffic such as reading news, etc. On the other
interface (different IP/MAC) I have anonymous traffic that is routed
through tor (tor.eff.org). Both go through the same default gateway
and communicate the same way. I've wanted to design a system for doing
this for a while, and I think I now have most of the expertise needed
to do it. But I'm not exactly sure how to choose where traffic from a
particular program goes (which is why I'm thinking about making any
"anonymous" traffic come from a virtual machine that can only see one
interface.
Comrade Ringo Kamens

On 8/31/07, Neal McBurnett <neal at bcn.boulder.co.us> wrote:
> It would help to know what your end goal is.  Why do you care which
> interface is used?  What other endpoints are you trying to communicate
> with?  Are you just playing with understanding interfaces?  Separating
> traffic for some particular reason?  Curiosity about routing?  There
> are lots and lots of techniques to play with networks and routing and
> making up packets etc etc.  But we'll just stay tied up in
> nomenclature until we get a "use case" to chew on - a problem to
> solve.
>
> -Neal
>
> On Fri, Aug 31, 2007 at 10:39:33AM -0400, Ringo Kamens wrote:
> > Ok, so how would I get the system to route a particular programs
> > traffic to a particular interface if they both get to the internet.
> > One idea would be to run a small socks proxy on localhost and then use
> > a proxy wrapper program to direct traffic that way. Would that work?
> > Comrade Ringo Kamens
> >
> > On 8/31/07, Dave Price <kinaole at gmail.com> wrote:
> > > User level program don't talk to an interface, they talk to the
> > > protocol stack which routes traffic to the appropriate interface
> > > depending on the IP address / or hostname needed.
> > >
> > > If you have virtual interfaces set up , and a given application sends
> > > data to the subnets served by those virtual interfaces, they will be
> > > used for that traffic.
> > >
> > > On 8/30/07, Ringo Kamens <2600denver at gmail.com> wrote:
> > > > Thanks for the sample commands. Is there any *simple* way to making a
> > > > program use a certain interface? I was thinking about running a
> > > > virtual machine that runs all of its traffic through one of the
> > > > multiple interfaces.
> > > > Thanks,
> > > > Comrade Ringo Kamens
> > > >
> > > > On 8/30/07, Dave Price <kinaole at gmail.com> wrote:
> > > > > Won't get you two MAC's but will get you two IP addresses
> > > > >
> > > > > ifconfig eth0:1  aaa.bbb.ccc.ddd
> > > > > ifconfig eth0:2  aaa.bbb.ccc.ddd
> > > > >
> > > > > as often as you want ... with different IP's  for each virtual interface
> > > > >
> > > > > you also me need to add a DEFAULT GATEWAY for each new subne that you
> > > > > define this way using the route command - assuming there is a gateway
> > > > > on the the subnet
> > > > >
> > > > > As mentioned before, I don't know if virtual IP's are supported on
> > > > > WLAN interfaces - never tried that...  the tricky bit would be getting
> > > > > the WLAN to associate with an access point on the appropriate IP
> > > > > subnet if that was needed .
> > > > >
> > > > > aloha (and hope this helps),
> > > > > dave
> > > > >
> > > > > On 8/30/07, Ringo Kamens <2600denver at gmail.com> wrote:
> > > > > > While it's true that the MAC address is burned into the card, it
> > > > > > doesn't mean it isn't changeable. The operating system manages the MAC
> > > > > > address and it can be changed at will so I would assume I could have
> > > > > > it flip-flop constantly between two interfaces. What commands would I
> > > > > > use to make multiple interfaces?
> > > > > > Comrade Ringo Kamens
> > > > > >
> > > > > > On 8/30/07, David Overcash <funnylookinhat at gmail.com> wrote:
> > > > > > > That's the problem that I think we failed to explain.  A MAC address is a
> > > > > > > unique identifier given to each networking card (whether it be wireless or
> > > > > > > wired), and each device is supposed to have only one per port (or antenna if
> > > > > > > you are wireless).
> > > > > > >
> > > > > > > So you can have two different IP addresses, if you have two different cards
> > > > > > > to create two interfaces on.
> > > > > > >
> > > > > > > -David
> > > > > > >
> > > > > > >
> > > > > > > On 8/30/07, Ringo Kamens <2600denver at gmail.com> wrote:
> > > > > > > > Sorry for the slow response, I was out camping in the wilderness. I
> > > > > > > > mentioned the ethernet card because I'd also be interested in setting
> > > > > > > > up two interfaces on that. Can somebody point me in the right
> > > > > > > > direction as to how to do this? Also, I don't see why a card couldn't
> > > > > > > > send from two MACs. Doesn't the system control that anyways instead of
> > > > > > > > the card?
> > > > > > > > Comrade Ringo Kamens
> > > > > > > >
> > > > > > > > On 8/27/07, Michael Robbert <mrobbert at gmail.com> wrote:
> > > > > > > > > Why do you need two different MACs? I don't see any reason that you
> > > > > > > couldn't
> > > > > > > > > multi home with two IPs from a wireless card.
> > > > > > > > > I am a little thrown off by your mention of the ethernet card. It
> > > > > > > doesn't
> > > > > > > > > sound like you intend to include that in the solution of your problem,
> > > > > > > but
> > > > > > > > > am I misreading your problem description?
> > > > > > > > >
> > > > > > > > > Mike
> > > > > > > > >
> > > > > > > > > On 8/26/07, Ringo Kamens < 2600denver at gmail.com> wrote:
> > > > > > > > > >
> > > > > > > > > > I have a problem I think somebody here may have enough expertise to
> > > > > > > > > > solve. I have one wireless card and one ethernet card. What I want to
> > > > > > > > > > do is set up two separate network interfaces so that I can have my
> > > > > > > > > > wireless card send data from two separate MAC and IP addresses. Is
> > > > > > > > > > this possible? Yes, I googled it and the results came up empty. I
> > > > > > > > > > would appreciate any help I could get.
> > > > > > > > > > Thanks,
> > > > > > > > > > Comrade Ringo Kamens
> > > > > > > > > >
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> > > > > dave
> > > > >
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