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Can anybody explain IP with /# at the end means and what is it called?
Example: 55.11.65.20/2, 212.63.89.33/2
Thank you so much!
Classless Inter-Domain Routing
http://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing
The modern standard form of specification of the network prefix is CIDR notation, used for both IPv4 and IPv6. It counts the number of bits in the prefix and appends that number to the address after a slash (/) character separator:
192.168.0.0, netmask 255.255.255.0 is written as 192.168.0.0/24
In IPv6, 2001:db8::/32 designates the address 2001:db8:: and its network prefix consisting of the most significant 32 bits.
This notation was introduced with Classless Inter-Domain Routing (CIDR) in RFC 4632. In IPv6 this is the only acceptable form to denote network or routing prefixes.
Check this links for more
http://en.wikipedia.org/wiki/Subnetwork
http://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing
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When you configurate some interface for a device using 'ifconfig eth0 xxx.xxx.xxx.xxx up' what's the difference bettween using IP like '192.168.0.2' and '192.168.0.2/30'.
I understand the idea of a submask and that it's good use for redirect datagrams only taking part of the IP address but I dont get why using it when assinging the IP for some interface.
I found out that using the submask when for assigning the IP address establish the range for the broadcast direction.
So using direction like '192.168.0.2' will establish broadcast on '192.168.0.255' but using '192.168.0.2/30' will use '192.168.0.3' since its the last avaible direction when you taking the first 30 bits.
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How can we determine if an IPv6 address is within a private CIDR?
On IPv4 it's straightforward, the subnet and the DNS mask are simple enough to understand.
With IPv6 every resource I find looks like the table below - but my own local IPv6 address starts with fe80, which doesn't seem to conform to the fd00 pattern indicated.
Can anyone help me understand private IPv6 ranges and why my own private IPv6 address would seem not to be in that range?
IPv6 does not have Private addresses the way IPv4 does. IPv6 used to have Site-Local addresses that were analogous to IPv4 Private addresses, but those were deprecated in favor of ULA (Unique Local Addressing), fc00::/7, of which the second half of the addressing, fd00::/8 is available for local assignment, but requires the next 40 bits to be randomly chosen. IPv4 Private addresses and the (deprecated) IPv6 Site-Local addressing were expected to have the same addresses used in multiple sites, but IPv6 ULA is expected to be unique with little chance for duplicate addresses.
What you are looking at is a Link-Local address (in the fe80::/10 range). Packets using Link-Local addresses are confined to a single link, unlike IPv6 Global and ULA addresses. You cannot route packets with Link-Local addresses as all links use the same Link-Local network. You can route ULA addresses, but not on the public Internet. Global addresses are globally routable.
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How many ways can 1 IPv4 address be interpreted, considering subnet masks? According to wikipedia, it seems like there are 32 possible subnet masks to 1 IP address, but I don't know.
It's not clear to me if a "network mask" is the same as a "subnet mask"; is there such a thing as applying more than 1 mask to an IP address?
network mask and subnet mask are essentially the same thing although there may be different representations. 255.255.255.0 or /24 are both mask representations. A give IP address can fall under different net masks, but there are some standard guidelines. Class A networks are generally lower numbers in the first octet. 10.0.0.0 is a Class A private space with a mask of 255.0.0.0 What that means is 10.anything is part of that network and should not be routed outside that network. you can do things like superneting which means change the subnet to something like 255.252.0.0 which limits the addresses in the network but is not a class a b or c. class B network is 255.255.0.0 . Class C is 255.255.255.0 . Class C is more commonly seen in home environments with a private address space of 192.168.x.0-255. as far as interpreting an ip address, any address is 1 address. the subnet mask tells you if it is a broadcast address(highest address) or a prefix(lowest address) or a valid address in the address space. it also tells a router if it should route the packet or not.
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MAC address are used for uniquely identifying my computer.
IP address are used for routing the packets to the network, as it has got a hierarchial structure, but it doesn't uniquely identifies a computer. So, after IPv6, each computer will have a unique IP address, so will there be any need of MAC address then?
Please do correct me, if I had understood something wrong.
No. MAC addresses operate at layer 2 ("data link layer"). The Internet Protocol (both IPv4 and IPv6) operates at layer 3 ("network layer").
These two layers are complimentary, and do not "replace" each other. For more information, read up on the TCP/IP suite.
IPv6 stateless address autoconfiguration (SLAAC) uses the MAC address to generate the address, but that does not mean they "replace" each other. It's simply a characteristic of the layer 2 interface being inherited by the layer 3 addressing. Other than that, completely complimentary.
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On Android, whenever an IPv6 address is assigned to an interface, the kernel would automatically add a default multicast route (ff00::/8) through that interface to the routing table. These routes seem to conflict (same metric) and cannot be deleted. What is the purpose of these routes?
ip -6 route
ff00::/8 dev eth0 metric 256
ff00::/8 dev v0 metric 256
The same metric is a hint that actually it is the same adapter and eth0 and v0 are only separate interfaces on that adapter. In other words a broadcast on one is the same as a broadcast on the other.
IPv6 no longer supports broadcast and applications must now use multicast.