[Xen-users] Re: domU network has sleeping sickness

[Martin Leben <ml060223@xxxxxxxx>]

Rudi Ahlers wrote:
> So, if dom0 is on 192.168.10.0/24, then would it be a problem if vm01 is 
> on .10/24 - .19/24, vm02 on .20/24 - .29/24, etc - all on the same IP 
> subnet?
Hi!

I don't quite understand the notation you use, but if you mean:
   "Can I use addresses in different subnets for my domU:s?"
... the answer is yes, of course you can if you have setup routing correctly. 
But you don't have to. You can have all your domU:s machines in the same subnet 
if you want. But if you have more than one address assigned to a single domU, 
the addresses should be in different subnets.

> How is a MAC address calculated? i.e in hex / dec / binary etc?
All MAC addresses are hex. See <http://en.wikipedia.org/wiki/MAC_address> for 
more info.

> Is aa.bb.cc safe to use for the 1st 3 octets?
Yes, because a MAC address that begins with "x2", "x6", "xA" or "xE" (where "x" 
is anything between 0-F inclusive) is a so called "locally administered 
address". No equipment you can buy should, as as I understand, use those MAC 
addresses.
As a side note I must admit that I am a little confused about the following, 
which contradicts what I just said. But I guess that the folks at IEEE just made 
a few mistakes.
lynx -dump http://standards.ieee.org/regauth/oui/oui.txt | \
egrep "^([0-9A-F][26AE]-[0-9A-F][0-9A-F]-[0-9A-F][0-9A-F])"
02-07-01   (hex)                RACAL-DATACOM
02-1C-7C   (hex)                PERQ SYSTEMS CORPORATION
02-60-86   (hex)                LOGIC REPLACEMENT TECH. LTD.
02-60-8C   (hex)                3COM CORPORATION
02-70-01   (hex)                RACAL-DATACOM
02-70-B0   (hex)                M/A-COM INC. COMPANIES
02-70-B3   (hex)                DATA RECALL LTD
02-9D-8E   (hex)                CARDIAC RECORDERS INC.
02-AA-3C   (hex)                OLIVETTI TELECOMM SPA (OLTECO)
02-BB-01   (hex)                OCTOTHORPE CORP.
02-C0-8C   (hex)                3COM CORPORATION
02-CF-1C   (hex)                COMMUNICATION MACHINERY CORP.
02-E6-D3   (hex)                NIXDORF COMPUTER CORPORATION
AA-00-00   (hex)                DIGITAL EQUIPMENT CORPORATION
AA-00-01   (hex)                DIGITAL EQUIPMENT CORPORATION
AA-00-02   (hex)                DIGITAL EQUIPMENT CORPORATION
AA-00-03   (hex)                DIGITAL EQUIPMENT CORPORATION
AA-00-04   (hex)                DIGITAL EQUIPMENT CORPORATION

BR
/Martin Leben


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