1.0.0.0/8 Now Routable?

Answered Question
Jan 28th, 2010

I was informed by a colleague that the 001/8 IPv4 address space was just allocated to APNIC by the IANA.

001/8    APNIC    2010-01    whois.apnic.net    ALLOCATED  

What does this do to certain devices (some of our Cisco Wireless Lan Controllers for example) that use addresses in this range by default for internal use?

ie: The WLC uses 1.1.1.1 for web-authentication.

Correct Answer by Jon Marshall about 7 years 3 weeks ago

rcoote5902 wrote:

I was informed by a colleague that the 001/8 IPv4 address space was just allocated to APNIC by the IANA.

001/8    APNIC    2010-01    whois.apnic.net    ALLOCATED  

What does this do to certain devices (some of our Cisco Wireless Lan Controllers for example) that use addresses in this range by default for internal use?

ie: The WLC uses 1.1.1.1 for web-authentication.

If the 1.0.0.0/8 network is now in use (and i don't know whether it is or not) then there are 2 key points to be aware of -

1) You might not be able to get some 1.x.x.x addresses on the internet if you wanted to because your routing tables might have 1.x.x.x entries for some of your internal devices

2) you need to make sure you do not "leak" these internal addresses onto the internet

Apart from that you should be fine.

Jon

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Reza Sharifi Thu, 01/28/2010 - 13:28

Hello,

10/8

172.16/12

192.168/16

There are private addresses and you can use them internally with no problems.  They are not routable over the Internet and are filter by ISPs.

If you have to get to the outside world (Internet) and using privated IPs internally then you have to use NAT.

HTH

Reza

Correct Answer
Jon Marshall Thu, 01/28/2010 - 13:29

rcoote5902 wrote:

I was informed by a colleague that the 001/8 IPv4 address space was just allocated to APNIC by the IANA.

001/8    APNIC    2010-01    whois.apnic.net    ALLOCATED  

What does this do to certain devices (some of our Cisco Wireless Lan Controllers for example) that use addresses in this range by default for internal use?

ie: The WLC uses 1.1.1.1 for web-authentication.

If the 1.0.0.0/8 network is now in use (and i don't know whether it is or not) then there are 2 key points to be aware of -

1) You might not be able to get some 1.x.x.x addresses on the internet if you wanted to because your routing tables might have 1.x.x.x entries for some of your internal devices

2) you need to make sure you do not "leak" these internal addresses onto the internet

Apart from that you should be fine.

Jon

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