Re: IP Address

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Errata....

I wrote:
In any case, a link-layer address is no more
nor less important than an IP address.

Okay, I'll concede that one might argue that the link-layer address is more important, because Ty qualified his statement with "depending on what you are trying to accomplish".

Most people think of "networking" as synonymous with "TCP/IP networking", a term that is usually intended to encompass all of the "Internet Procotol Suite", once known as the (D)ARPA protocols.

In that context, both addresses are equally important.

But there are other network-layer protocols besides IP(v4 and v6). The point is: all network layer require the link-layer address, but not all network layers use IP addresses.

In that sense, someone (not me) might say that the link-layer address may be considered more important.


----- original message -----

"JoeU2004" <joeu2004@xxxxxxxxxxx> wrote in message news:eTZViggIKHA.1684@xxxxxxxxxxxxxxxxxxxxxxx
"Ty" <tyrone_bak@xxxxxxxxx> wrote:
That is a Machine address.

Yes and no, depending on how you are (mis)using the terminology.

There is no such thing as a "machine address", at least not for networking purposes.

There are link interface addresses, and there are upper protocol layer addresses -- in this case, the IP layer.

Various people refer to the link-layer address and/or the IP address as a "machine address". Some authors apply the term to both addresses in the same text(!). The term is ambiguous and poorly used.

In any case, fe80::40f4:21bf:bd1a:34e8 is an IP-layer address -- specifically, the IPv6 layer. It is not a link interface address (aka MAC address).


All devices connected to a network have a machine address.
That is more important than an ip address depending on what
you are trying to accomplish.

All interfaces connected to a network have one or more link-layer addresses -- but usually only one. fe80::40f4:21bf:bd1a:34e8 is __not__ one of them.

In any case, a link-layer address is no more nor less important than an IP address.

To avoid launching (deeper) into Interworking 101, suffice it to that you could not post your comments without both link-layer and IP (probably IPv4) addresses, among others.


----- original message -----

"Ty" <tyrone_bak@xxxxxxxxx> wrote in message news:59ea555b-1fb7-42a7-a654-257e3aea3563@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
On Aug 20, 7:16 pm, "jaf" <m...@xxxxxxxx> wrote:
Hi Joe,
As I said, IPCONFIG (in Vista) reported.....

John



"JoeU2004" <joeu2...@xxxxxxxxxxx> wrote in messagenews:ebW%23ILdIKHA.5968@xxxxxxxxxxxxxxxxxxxxxxx
> "jaf" <m...@xxxxxxxx> wrote:
>> IPCONFIG reports it as "Link-local IPv6 Address "
>> It's the MAC address of your PCs LAN card or CNR.

> Not exactly. Yes, it is a "link local" IPv6 address. And yes, the lower > 64
> bits are the link "interface id". The "interface id" is derived from > the
> MAC address. But it is not the MAC address exactly, in part depending > on
> the standard followed by the link interface.

> In Rick's case, it does appear to be the 64-bit MAC address (almost). > But
> for 48-bit MAC addresses, the "interface id" in the IPv6 address is the > two
> halves (24 bits each) separated by 0xFFFE.

> (And there are the "link local" IPv6 addresses for point-to-point > interfaces
> that might not have a MAC address.)

> But in case, the 64-bit "interface id" differs from the MAC address (or
> modified MAC address) by changing one bit from 0 to 1.

> My point is: do not try to use the IPv6 "interface id" in the "link > local"
> address as MAC address directly.

> PS: Rick, I wonder why you are seeing IPv6 addresses. Is this a Vista
> thing? I do not see IPv6 on my interfaces, using Win XP SP3. But that
> might be because I am relying on automatic configuration (DHCP) from a > local
> router. As I said, IPv6 is not widely used, at least not by default.

> ----- original message -----

> "jaf" <m...@xxxxxxxx> wrote in message
>news:OnqLx7cIKHA.1492@xxxxxxxxxxxxxxxxxxxxxxx
>> Hi Rick,
>> IPCONFIG reports it as "Link-local IPv6 Address "

>> It's the MAC address of your PCs LAN card or CNR.

>> Now we all can hack into your pc.
>> Thanks

>> 8<)

>> John

>> "Rick Rothstein" <rick.newsNO.S...@xxxxxxxxxxxxxxxxxx> wrote in >> message
>>news:Op2B3UcIKHA.5968@xxxxxxxxxxxxxxxxxxxxxxx
>>> Hey! I just finished up some code using the same approach (and, from >>> the
>>> variable names, it looks like from the same source). I took a >>> different
>>> end route than you did, however, choosing to make my code a function
>>> instead. Here is that code...

>>> Function GetMyIPaddress() As String()
>>> Dim X As Long, IPaddress() As String, Query As String
>>> Dim Addresses() As String, objWMIService As Object
>>> Dim ipConfigSet As Object, ipConfig As Object
>>> Addresses = Split("")
>>> Query = "Select IPAddress from Win32_NetworkAdapterConfiguration "
>>> Set objWMIService = GetObject("winmgmts:\\.\root\cimv2")
>>> Set ipConfigSet = objWMIService.ExecQuery(Query)
>>> For Each ipConfig In ipConfigSet
>>> If Not IsNull(ipConfig.IPaddress) Then
>>> For X = LBound(ipConfig.IPaddress) To UBound(ipConfig.IPaddress)
>>> 'If ipConfig.IPaddress(X) Like "*#*.*#*.*#*.*#*" Then
>>> ReDim Preserve Addresses(UBound(Addresses) + 1)
>>> Addresses(UBound(Addresses)) = ipConfig.IPaddress(X)
>>> 'End If
>>> Next
>>> End If
>>> Next
>>> GetMyIPaddress = Addresses
>>> End Function

>>> The code returns a String array containing all the IP address on the
>>> system. In my case, it found two...

>>> 192.168.1.3
>>> fe80::40f4:21bf:bd1a:34e8

>>> I don't know what that 2nd one is (I have no real experience with
>>> networks), but the code returned it, so it must be 'something'<g>.
>>> Anyway, if the OP wants only ###.###.###.### type IP addresses >>> returned,
>>> the code is set up to do that... he should just remove the >>> apostrophes
>>> (comment symbols) from in front of the two commented out lines in >>> order
>>> to activate them... doing that will make the function only return
>>> "normal" looking (at least to me) IP addresses. To retrieve all the >>> IP
>>> addresses on the system (either with or without those commented out
>>> lines), code similar to this should be used...

>>> Dim X As Long, IPaddresses() As String
>>> IPaddresses = GetMyIPaddress
>>> For X = 0 To UBound(IPaddresses)
>>> Debug.Print IPaddresses(X)
>>> Next

>>> where the Debug.Print line would be replaced by the active code the >>> OP
>>> wants to use.

>>> --
>>> Rick (MVP - Excel)

>>> "Steve Yandl" <sya...@xxxxxxxxxxx> wrote in message
>>>news:X8ydnUZgZppHDBDXnZ2dnUVZ_i2dnZ2d@xxxxxxxxxxxxxxx
>>>> Sam,

>>>> Provided the PCs are XP or later, this might do what you want:

>>>> '------------------------------------

>>>> Sub GetIPaddy()

>>>> Dim strIPAddress As String
>>>> Dim strComputerName As String

>>>> strComputerName = "."

>>>> Set objWMIService = GetObject("winmgmts:\\" & strComputerName &
>>>> "\root\cimv2")

>>>> Set colItems = objWMIService.ExecQuery _
>>>> ("Select * From Win32_NetworkAdapterConfiguration Where IPEnabled
>>>> = True")

>>>> For Each objItem In colItems
>>>> For Each objAddress In objItem.IPAddress
>>>> strIPAddress = objAddress
>>>> Next
>>>> Next

>>>> MsgBox strIPAddress

>>>> Set colItems = Nothing
>>>> Set objWMIService = Nothing

>>>> End Sub

>>>> '------------------------------------

>>>> Steve Yandl

>>>> "Sam Wilson" <SamWil...@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
>>>>news:9C915E1F-8A74-46B1-8D49-1D9FBEB8D381@xxxxxxxxxxxxxxxx
>>>>> Not as straight forward as I'd guessed!

>>>>> "Rob Bovey" wrote:

>>>>>> "Sam Wilson" <SamWil...@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in >>>>>> message
>>>>>>news:B303C328-1348-4AD2-B9DD-ACF2C1D2CD7C@xxxxxxxxxxxxxxxx
>>>>>> > How can I get my the IP address of a computer using VBA? I was
>>>>>> > hoping it'd
>>>>>> > be through environ() but it seems not...

>>>>>> Hi Sam,

>>>>>> I've posted an example of how to do this here:

>>>>>>http://appspro.com/Tips/NetworkTips.htm#NT2

>>>>>> --
>>>>>> Rob Bovey, Excel MVP
>>>>>> Application Professionals
>>>>>>http://www.appspro.com/

>>>>>> * Professional Excel Development - Second Edition *
>>>>>>http://www.appspro.com/Books/ProExcelDev.htm- Hide quoted text -

- Show quoted text -

A Network question in the Excel section. Wow!! I love networking.
To answer the question for the 2nd or 3rd time up top. That is a
Machine address. All devices connected to a network have a machine
address. That is more important than an ip address depending on what
you are trying to accomplish.

.

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