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Phenom01
PostPosted: Sun Sep 09, 2012 6:07 pm 
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"::". Is this valid? if so what does this address mean?
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RoDDy
PostPosted: Sun Sep 09, 2012 6:18 pm 
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Phenom01 wrote:
"::". Is this valid? if so what does this address mean?


:thinking: hmmmm it looks to me as tho it is 2 colons?

Thats my best guess
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Phenom01
PostPosted: Sun Sep 09, 2012 6:40 pm 
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RoDDy wrote:
Phenom01 wrote:
"::". Is this valid? if so what does this address mean?


:thinking: hmmmm it looks to me as tho it is 2 colons?

Thats my best guess

Yes it is 2 colons.
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Carlitos_30
PostPosted: Sun Sep 09, 2012 7:00 pm 
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It's look like a only zeros address.
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Phenom01
PostPosted: Sun Sep 09, 2012 7:30 pm 
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Carlitos_30 wrote:
It's look like a only zeros address.

But is this valid? I got this question on a practice exam.
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srg
PostPosted: Sun Sep 09, 2012 11:53 pm 
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:: is called unspecified address and is 'valid' in that sense that it can be seen in a packet, but I dont think you are able to manually use it. Tricky.. how exactly are the question worded?

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Carlitos_30
PostPosted: Fri Sep 14, 2012 5:30 pm 
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Only zeros address are seen when a host with no IP address configured, ask for an IP to a DHCP server. The source IP address in this case is only zeros.

Quote:
But is this valid?


This depends. Valid in what sense?
All IP address are valid if each octet range from 0 to 255:

0.0.0.1 is a valid IP address, but you can't assign that IP to any host.
255.0.0.1 is a valid IP address, reserved for experimental purposes. Not assignable to a host neither.

192.300.4.1 is an invalid IP address.
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Ocelaris
PostPosted: Mon Sep 17, 2012 9:22 pm 
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My vote is yes, it's valid, because I believe :: is equivalent to 0.0.0.0 i.e. you don't really use it for anything, but it's useful for wild cards.

http://docs.oracle.com/javase/1.4.2/doc ... pv6_guide/

"Special IPv6 Address Types

Unspecified address (:: corresponding to 0.0.0.0 in IPv4)"
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Parman05
PostPosted: Mon Sep 17, 2012 11:49 pm 
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:: equals ipv6 loopback address.
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srg
PostPosted: Tue Sep 18, 2012 12:15 am 
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Parman05 wrote:
:: equals ipv6 loopback address.

No, ::1/128 is loopback.

Sent from phone.

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Parman05
PostPosted: Tue Sep 18, 2012 12:53 am 
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Oh yeah you have to have the one. I knew that.

With that pointed out I would have to agree it would be all 0 address.
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mellowd
PostPosted: Tue Sep 18, 2012 2:59 am 
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It's a valid address, but invalid as a host address

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Parman05
PostPosted: Tue Oct 09, 2012 4:56 pm 
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I know this is a little old but i just ran across this and though it would share.

Quote:
The unspecified address is 0:0:0:0:0:0:0:0 (also identifies as :: or ::/128). The unspecified address is used when there is no IPv6 address. It is typically used during system startup when the host has not yet configured its address. The unspecified address should not be assigned to an interface.
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