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65 lines
2.5 KiB
Plaintext
65 lines
2.5 KiB
Plaintext
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== NTK_RFC 0008 ==
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Subject: Private IP classes in restricted mode
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----
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This text describes a change to the Npv7.
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It will be included in the final documentation, so feel free to correct it.
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But if you want to change the system here described, please contact us first.
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----
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The user can decide to use, in restricted mode, a different private IP
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class from the default one ( 10.x.x.x ). This is useful if the 10.x.x.x class
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cannot be used, for example in Russia, it is very popular to provide Internet
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access through big LANs which use the 10.x.x.x class.
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The other available classes are:
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{{{
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172.16.0.0 - 172.31.255.255 = 16*2^16 = 1048576 IPs
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192.168.0.0 - 192.168.255.255 = 2^16 = 65536 IPs
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}}}
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The 192.168.x.x class cannot be used as an alternate restricted mode IP class
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because it is the default Netsukuku private class, thus the only alternative
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to 10.x.x.x is the "172.16.0.0 - 172.31.255.255" IP class.
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However it is adviced to always use the default class.
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== Netsukuku private classes ==
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It necessary to provide at least one private IP class inside Netsukuku to
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allow the creation of private LANs which are connected to Netsukuku with just
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one node.
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The default Netsukuku private class is 192.168.x.x.
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The random IPs choosen by the nodes will be never one of that class.
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The default private class is valid both in normal and restricted mode.
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Only in normal mode the "172.16.0.0 - 172.31.255.255" class becomes private.
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This class is assigned to very large private networks.
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The 10.x.x.x class IS NOT private since it is too big and it would be just a
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waste of IP addresses to use it as a private class.
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Note also that for each Netsukuku node you can have a private network,
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therefore with just 16 Netsukuku nodes you can form a private network of
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16777216 nodes, which is equivalent to a 10.x.x.x class.
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== Notes on the restricted mode ==
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A node which runs in restricted mode cannot be compatible with normal mode
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nodes, for this reason a restricted node will drop any packets coming from a
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normal node.
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While in restricted mode the "172.16.0.0 - 172.31.255.255" class IS NOT
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private.
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In restricted mode, when two different networks which use different
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private classes (say 10.x.x.x and 192.168.x.x) are linked, nothing happens and
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they will not rehook, this is necessary because it's assumed that the specified
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private class is the only choice the user can utilize.
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This leds to some problems, consider this scenario:
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{{{
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10.0.0.0 <-> 172.16.0.0
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}}}
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In this case the rehook isn't launched, so it is possible that there will be a
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lot of collision.
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