[ale] 5.x.x.x IP range

[Justin Goldberg]

This reminds me of our customers who use 192.25.25.0/24 and
100.0.0.0/24 on their LAN, which are public IP addresses. It hasn't
caused any problems so far. Hah!

On 1/8/14, Bugs <bugs at solprime.net> wrote:
> This is a handy reference of all the current top level /8 allocations.
>
> http://www.iana.org/assignments/ipv4-address-space/ipv4-address-space.xhtml
>
> On 12/13/2013 09:55 PM, Edward Holcroft wrote:
>> Came across this from which  glean that 5.0.0.0/8 <http://5.0.0.0/8> was
>> not always publicly allocated:
>>
>> http://www.cisco.com/web/about/ac123/ac147/archived_issues/ipj_10-3/103_awkward.html
>>
>> The literature says it was used until recently by Hamachi
>> http://en.wikipedia.org/wiki/Hamachi_(software). I am wondering if one
>> of my colleagues sneaked in a Hamachi server somewhere on the network
>> that is handing these IP's to the PPTP clients.
>>
>> ed
>>
>>
>>
>> On Fri, Dec 13, 2013 at 5:54 PM, Michael B. Trausch <mbt at naunetcorp.com
>> <mailto:mbt at naunetcorp.com>> wrote:
>>
>>     On 12/13/2013 02:31 PM, Edward Holcroft wrote:
>>>     What is 5.x.x.x? I've never heard of them before and am I allowed
>>>     to use them? More importantly, where are they coming from? I never
>>>     set anything to offer IP's in that range, unless it's some kind of
>>>     default.
>>
>>     The whois utility can tell you a good bit:
>>
>>       * 5.0.0.0/8 <http://5.0.0.0/8> is *allocated* for assignment by
>>         RIPE, meaning that these addresses belong in Europe.
>>       * Various chunks of it are assigned to ISPs and backbone links
>>         (e.g. 5.0.0.0/17 <http://5.0.0.0/17>).
>>
>>     This means that you should absolutely not be using these IP
>>     addresses, as they /will/ conflict with the public Internet.
>>
>>     Verify that the configuration of the server handing out the
>>     addresses is correct; even Microsoft products should not
>>     intentionally be using IP address space that is not allocated to it,
>>     unless some administrator in the admin chain told it to figuring
>>     that it wouldn't hurt anything.
>>
>>     Remember the private IPv4 networks:
>>
>>      1. 10.0.0.0/8 <http://10.0.0.0/8> if you need something very large.
>>      2. 172.16.0.0/12 <http://172.16.0.0/12> if you need something
>>         moderately large and nonconflicting.
>>      3. 192.168.0.0/16 <http://192.168.0.0/16> if you need something
>>         recognizable.  I don't use this range anymore, myself.
>>
>>     I also use the TEST-NET-1 through TEST-NET-3 allocations for
>>     LAN-only testing of development apps and systems, but I never deploy
>>     anything with those addresses.
>>
>>     For dial-in and VPN access, you should be using either addresses
>>     assigned to you by your upstream (e.g., your ISP or ARIN), RFC1918
>>     space (one of the three ranges listed above), or assigned, delegated
>>     or organization-local IPv6 addressing.
>>
>>     Ideally, the VPN should be its own routed subnet.  This isn't always
>>     possible though, so many VPN servers will actually do proxy-ARP to
>>     make the VPN-connected peers appear to be on the local subnetwork.
>>
>>         — Mike
>>
>>     --
>>     Naunet Corporation Logo 	Michael B. Trausch
>>
>>     President, *Naunet Corporation*
>>     ☎ (678) 287-0693 x130 <tel:%28678%29%20287-0693%20x130> or (855)
>>     NAUNET-1 x130
>>     FAX: (678) 783-7843 <tel:%28678%29%20783-7843>
>>
>>
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>>
>> --
>> Edward Holcroft | Madsen Kneppers & Associates Inc.
>>
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