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Originally posted by XOR != OR
Is there a specific reason this was brought back up? I checked the other thread, and it seems like the question was answered fully.
Damn it, the cheese defense!Originally posted by skritch
Reason: "Behold, the power of cheese."
Originally posted by PHUNBALL
A MAC address can be spoofed ( changed in the operating system) but can not be changed on the card itself, it is a hardware address...
Originally posted by oakfan52
he was refering to a cable modem not a NIC. Yes i'm sure it is humanly possible to change the MAC ID on a cable modem. Just like it Humanly possible to walk on the moon. Can 99% of people do. I don't think so. It hard coded at the factory. Since it can be done it can be undone and redone =P.
Originally posted by PHUNBALL
I was not aware that he was talking about a cable modem since he did not say anything about it. So, in that case the answer is no. You can still spoof a different MAC when sending outbound packets, but they will never make it back to your location because the ARP tables on the far ends routers will be trying to send data to a MAC address (spoofed) that does not really exist...
Originally posted by skritch
And now, for how things ACTUALLY work:
MACs are only valid on the wire they're originally put on.
No "spoofed MAC" would ever make it to "the far ends routers", because every time a packet transits a hop, the IP header's MAC field is replaced with the MAC of that hop. And the ARP tables have nothing to do with anything; the ARP cache would contain the MAC associated with the last hop before that device received the packet. MACs simply do not cross transit boundaries (i.e., "hops" in the vernacular).
Of course, I probably don't know what I'm talking about; I just spent all morning tweaking C source that generates custom IP headers. I've just been doing this for 25 years. Ignore me.
Now then. What were you saying? Oh, yes. You were going on about some pseudo-networking twaddle. Carry on.
Originally posted by PHUNBALL
WTF, my apologies grand master but in this scenario I was referencing the far end as the PE router and the near side would of course be the CE router as being viewed from the customer end. In this case you absolutely can "SPOOF" the MAC address and since the PE routers ARP cache will contain the incorrect MAC address the return packet will never reach it's destination...
BTW, the fact that you have been doing this for 25 years does not impress me at all, about the only thing I get from that is that you must be one old bastard and a grouchy one at that...
Originally posted by skritch
You can't spoof a MAC from a source other than the device itself unless you're perpetrating a MitM attack, and acting as a transparent bridge, rewriting the packets in transit.
Even then, you'd best hope you're electrically closer to the source than the destination, or the destination is more likely to see the unmolested packet.
But, surely you know all this. You just forgot to mention it. After all, you're very well-versed in MAC spoofing.
And I don't care if you're impressed or not. I just care that you get things right. I just thought I'd point out that I've been doing this longer than you've probably been on this planet.
Originally posted by skritch
And I don't care if you're impressed or not. I just care that you get things right. I just thought I'd point out that I've been doing this longer than you've probably been on this planet. You might want to think about that before you cop an attitude with me in other threads.
Originally posted by PHUNBALL
Well, apparently you are not very good at proving your own point while disproving someone else because if I am not mistaken you just said it can be done, right?
BTW, nice try on the age thing, surely someone as intelligent as you claim to be would know better than to assume things, right?
If you truly care about making sure the correct information is given then please by all means feel free to correct me, but do not attack me with your arrogant attitude for no reason whatsoever.
BTW, nice picture, you look just like every other Unix admin I have ever met and NO, that is not a compliment (figured I would throw in a personal attack as well since you seem to thrive on handing them out)...
Originally posted by skritch
It was an assumption based on behavior and knowledge. Surely you don't mean to imply you're older than I am, and yet still so ignorant?
No reason whatsoever? You attacked first in another thread. I just thought I'd feed you a taste of your own holier-than-thou medicine.
No problem. I look nothing like that anymore. Even if I did, it should be obvious to you that your opinion of my appearance matters not one whit. It's my ability, not my appearance, that matters.
Most of those pictures are more than a year old. Even if I still looked like that, you should hope and pray that you get the luxury of looking like that while pulling down very good money and doing something you love at my age.
Enjoy your suit and tie world, sheep.
Originally posted by Joony
won't we ever run out of mac addresses?
And now, for how things ACTUALLY work:
No "spoofed MAC" would ever make it to "the far ends routers", because every time a packet transits a hop, the IP header's MAC field is replaced with the MAC of that hop. And the ARP tables have nothing to do with anything; the ARP cache would contain the MAC associated with the last hop before that device received the packet. MACs simply do not cross transit boundaries (i.e., "hops" in the vernacular).
Of course, I probably don't know what I'm talking about; I just spent all morning tweaking C source that generates custom IP headers. I've just been doing this for 25 years. Ignore me.
Now then. What were you saying? Oh, yes. You were going on about some pseudo-networking twaddle. Carry on.
Enjoy your suit and tie world, sheep.