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What does IPv4 /32 (1 IPv4) and IPv6 bloc /48 mean?
I'm a late bloomer to server side technologies. Could someone explain/link me to what I need to read about this?
While ordering a dedicated server, I saw these listed. What exactly do these mean? "IPv4 /32 (1 IPv4) and IPv6 bloc /48"? I dont think they're 32 individual IPv4 addresses for public use. What are these?
Also, what exactly are failover IPs? Are they just additional IPv4 addresses that can be publicly assigned on my nameserver?
I'd love to read 'The Manual', if someone can point me to what page this is at.
Comments
http://www.ripe.net/internet-coordination/press-centre/understanding-ip-addressing
http://articles.slicehost.com/2008/10/28/ip-failover-high-availability-explained
Both articles are #2 and #3 search results, respectively, from google searches.
http://en.wikipedia.org/wiki/Subnetwork
http://en.wikipedia.org/wiki/IPv4_subnetting_reference
http://en.wikipedia.org/wiki/IPv6_subnetting_reference
My keywords were dopey. Thanks.
For a while with all the talk about slices, it seemed like they were talking about pizza.
http://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing#IPv4_CIDR_blocks
Yeah that's the CIDR, you'll learn more about it from IP subnetting and such (and then you can grab your CCNA easy).
TL;DR IPv4 /32 is a single IPv4 address.
IPv6 /48 is much more than you would ever need.
@joelgm - There are quite a few methods/shortcuts you can use to figure out an IPv4 CIDR without using something like Jodies ipcalc.
The method I use is this:
For example 192.168.1.0/28
32 - 28 = 4
2^4 = 16
16 host IP's in this CIDR/range, starting with 192.168.1.0 and ending with 192.168.1.15
192.168.1.0 is the network address.
192.168.1.15 is the broadcast address.
Useable IP's are 192.168.1.1 thru 192.168.1.14
The gateway address can be any in the useable range but will normally be 192.168.1.1 or 192.168.1.14.
The netmask is:
255.255.255.(256-16)
After a while though you just start memorizing them.
While this method does not provide a real understanding of the binary system behind it, it does however give you a little better understanding of how it works than say just using an IP calculator.
Translation:
1 IPv4 Address
1 208 925 819 614 629 174 706 176 IPv6 Addresses
IPv6 blows it out of proportion.
Can failover IPs be used as regular IPs for virtualization?