How to change MAC Address Ricoh MP 4054

[davidmtupper]

No two mac addresses are the same on the planet

This is a false statement. Only the last 3 octets are unique, the first 3 are company and equipment identifiers. I worked for a company that serviced a large pharma company in Connecticut and we frequently had to move network cards to different network segments to fix this issue.

[slimslob]

This is a false statement. Only the last 3 octets are unique, the first 3 are company and equipment identifiers. I worked for a company that serviced a large pharma company in Connecticut and we frequently had to move network cards to different network segments to fix this issue.

Then that pharma company had a system that was not looking at entire MAC. Not a good idea. Either that or who ever was manufacturing the network cards was not following international standards and making cards with the same MAC hoping that they did not end up on the same network.

[davidmtupper]

Then that pharma company had a system that was not looking at entire MAC. Not a good idea. Either that or who ever was manufacturing the network cards was not following international standards and making cards with the same MAC hoping that they did not end up on the same network.

Could have been a little of both. The computers were Compaq (before you laugh, their commercial stuff was pretty damn robust, unlike the home line) and Pfizer did have some issues, like authenticating against the least busy DC, which happened to be in Japan in the morning in Groton, CT. This was in the late 90's, early 2000's so high speed access was relative.

[slimslob]

Could have been a little of both. The computers were Compaq (before you laugh, their commercial stuff was pretty damn robust, unlike the home line) and Pfizer did have some issues, like authenticating against the least busy DC, which happened to be in Japan in the morning in Groton, CT. This was in the late 90's, early 2000's so high speed access was relative.

In the late 90's and early 200's computer registers not storing the entire MAC address wad definitely a probability.

[dalewb74]

Going to have to call BS on that. I could potentially see three devices with the same host name, but no manufacturer is ever going to let a duplicate MAC slip through QC, let alone three of them. That's a hardware level feature, not software.

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sounds like someone did something with a bit of cloning somehow? maybe? but i agree no 3 the same...

[KenB]

Somebody is smoking something.

Sorry, no duplicate MAC addresses.

They may be extremely similar. but NOT the same between any 2 or more devices.

[BillyCarpenter]

Somebody is smoking something.

Sorry, no duplicate MAC addresses.

They may be extremely similar. but NOT the same between any 2 or more devices.

Let's just assume for a minute that a company fucked up and issued the same Mac Address 3 times. I don't believe it but lets assume. What are the odds that an individual just happened to end up with those 3 machines? I would say that the odds would be astronomical.

What are the odds of two devices having the same MAC address?




zero





What is the probability of having two identical MAC addresses within one network? The IEEE manages MAC addresses. The hardware identification addresses that the IEEE distributes are unique. That makes the probability of matching MAC addresses zero.

[slimslob]

Let's just assume for a minute that a company fucked up and issued the same Mac Address 3 times. I don't believe it but lets assume. What are the odds that an individual just happened to end up with those 3 machines? I would say that the odds would be astronomical.

For a major nationwide corporation that often purchase an entire day's production from a single manufacturer, I would say extremely possible.

[rthonpm]

For a major nationwide corporation that often purchase an entire day's production from a single manufacturer, I would say extremely possible.

That would still require a lot of coincidence. All three controllers shipping at the same time for the same build runs, the same PO, and same container to the domestic rep. Unless the serial numbers are also in tight sequence I'd have a hard time believing in that much coincidence. That's like getting lightning to strike you three times on the same day for three years straight at the same location.

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[kevslane]

Fact is he does not have 3 machines with the same MAC address and his problem lies elsewhere on his network and he needs to address that and get over it being a machine problem.

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