From: marc van hoof (mvh@marcvanhoof.com)
Date: Wed Oct 20 2004 - 22:52:41 GMT-3
hmm - yes - you would HOPE that, wouldn't you :)
i'd make the decision based on the wording of the question - if it says
block an address, then block an address... if it says block a network or
range, then block a network or range...
my main issue is that, while 127.0.0.1 is the reserved loopback address on
microsoft boxes, it is also the reserved loopback address on every other
ip stack... the wording "microsoft reserved loopback address" is
misleading.
-marc.
On Wed, 20 Oct 2004 istong@stong.org wrote:
> I would hope that Cisco does not ask such a vague question
> on the test :) The 127.0.0.0/8 network is reserved (where
> 127.0.0.1 is typically the loopback address) and is often
> filtered on routers if they are using the bogon lists. The
> 169.254.0.0/16 is assigned by windows xp for example when
> you don't have a static assigned or when you have dhcp
> enabled but no response is returned. I would say the 169
> network is more Microsoft specific than the 127 network if I
> had to pick :)
>
>
> Ian
> http://www.ccie4u.com
> CCIE Lab Rack Rentals and Lab Scenarios
>
>
>
>
>> So just to make things sure, the "microsoft loopback
>> address range" is 127.0.0.0/8 not 169.254.0.0/16??
>>
>> Cheers,
>> JP
>>
>> -----Original Message-----
>> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]
>> On Behalf Of marc van hoof
>> Sent: 27 September 2004 23:42
>> To: 'Church, Chuck'; 'marc van hoof'; 'Howard C.
>> Berkowitz'; ccielab@groupstudy.com
>> Subject: RE: microsoft 1918 address
>>
>> How much can I talk about this without breaking the NDA ??
>> ;)
>>
>>
>>> -----Original Message-----
>>> From: Church, Chuck [mailto:cchurch@netcogov.com]
>>> Sent: Monday, 27 September 2004 11:00 PM
>>> To: marc van hoof; Howard C. Berkowitz;
>>> ccielab@groupstudy.com Subject: RE: microsoft 1918
>>> address
>>> I hope they've never ask a question that ambiguous! It
>>> implies that this vendor has their own loopback address,
>>> other than 127.0.0.0/8. Conversely, the 169.254.0.0/16
>> wouldn't ever be considered loopback, as
>>> it doesn't loop anything back. It is considered a bogon
>>> (http://www.cymru.com/Documents/bogon-list.html ) and
>> should be filtered
>>> like any others.
>>>
>>> P.S. 127.0.0.0/8 is a great block to use for Windows
>>> machines. I've yet to be infected once since using it
>>> ;)
>>>
>>> Chuck Church
>>> Lead Design Engineer
>>> CCIE #8776, MCNE, MCSE
>>> Netco Government Services - Design & Implementation
>>> 1210 N. Parker Rd.
>>> Greenville, SC 29609
>>> Home office: 864-335-9473
>>> Cell: 703-819-3495
>>> cchurch@netcogov.com <-note new address!
>>> PGP key:
>>
> http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x4371A48D
>>>
>>>
>>> -----Original Message-----
>>> From: nobody@groupstudy.com
>> [mailto:nobody@groupstudy.com] On Behalf Of
>>> marc van hoof
>>> Sent: Monday, September 27, 2004 2:26 AM
>>> To: 'Howard C. Berkowitz'; ccielab@groupstudy.com
>>> Subject: RE: microsoft 1918 address
>>>
>>> While i can't say too much due to NDA's in place...
>>> <clears throat>
>>> $10* says that if they're asking you to block a
>>> "microsoft loopback address" they mean 127.0.0.1 and
>> just haven't mentioned that it's also a
>>> non-microsoft loopback address...
>>>
>>> regards,
>>> -marc.
>>>
>>> *Please note, $10 is in Australian currency and
>>> therefore useless.
>>> -----Original Message-----
>>> From: nobody@groupstudy.com
>> [mailto:nobody@groupstudy.com] On Behalf Of
>>> Scott Morris
>>> Sent: Sunday, September 26, 2004 12:39 PM
>>> To: 'Howard C. Berkowitz'; ccielab@groupstudy.com
>>> Subject: RE: microsoft 1918 address
>>>
>>>
>>> Ahh... I stand corrected! (or sit as the case may be!)
>>>
>>> Scott
>>>
>>> -----Original Message-----
>>> From: nobody@groupstudy.com
>> [mailto:nobody@groupstudy.com] On Behalf Of
>>> Howard C. Berkowitz
>>> Sent: Saturday, September 25, 2004 10:11 PM
>>> To: ccielab@groupstudy.com
>>> Subject: RE: microsoft 1918 address
>>>
>>> At 9:56 PM -0400 9/25/04, Scott Morris wrote:
>>>> While that's true, I believe RFC 3330 (if memory
>>> serves) came AFTER >Microsoft decided to start handing
>>> out these addresses. >
>>>> One o' them things. :)
>>>
>>> No, Microsoft decided to use it after MIT was using it
>>> on their networks,
>>> according to a conversation I had with Jeff Schiller,
>>> MIT network manager
>>> and former Security Area Director of the IETF.
>>>
>>>>
>>>>
>>>> Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service
>>> Provider) #4713, CISSP,
>>>> JNCIP, et al.
>>>> IPExpert CCIE Program Manager
>>>> IPExpert Sr. Technical Instructor
>>>> swm@emanon.com/smorris@ipexpert.net
>>>> http://www.ipexpert.net
>>>>
>>>>
>>>>
>>>> -----Original Message-----
>>>> From: nobody@groupstudy.com
>> [mailto:nobody@groupstudy.com] On Behalf Of
>>>> James
>>>> Sent: Saturday, September 25, 2004 8:05 PM
>>>> To: joshua lauer
>>>> Cc: John Matus; lab
>>>> Subject: Re: microsoft 1918 address
>>>>
>>>> On Sat, Sep 25, 2004 at 07:47:14PM -0400, joshua lauer
>>> wrote: >> I know when you dont have ip assigned ala'
>> dhcp or static XP assigns
>>>>> you some itself, this is to facilitate "plug and
>>> play networking" for
>>>>> home user. Those are in the private range, as far as
>>> them being >> allocated to MS, I'm not sure..
>>>>
>>>> It's not a Microsoft thing. It's an industry approved
>>> standard addr space
>>>> for link local... It's kind of like IPv6's built-in
>> link local, except
>>> that
>>>> it behaves differently in v4.. :)
>>>>
>>>> hth,
>>>> -J
>>>>
>>>>
>>>>> >MCSE, CCNP
>>>>> >Office: 818-782-2061
>>>>> >Cell: 818-430-8372
>>>>> >jmatus@pacbell.net
>>>>> >
>>>>>
>>>
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>>>> --
>>>> James Jun
>>> TowardEX Technologies,
>>>> Inc.
>>>> Technical Lead Network Design,
>>> Consulting, IT >Outsourcing
>>>> james@towardex.com Boston-based
>> Colocation & Bandwidth
>>>> Services
>>>> cell: 1(978)-394-2867 web:
>>> http://www.towardex.com , noc: >www.twdx.net
>>>>
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