doc: Clarify some interface file properties
* Interface file is case-sensitive and all lower-case * Clariry netmask handling and fallback Signed-off-by: Maximilian Wilhelm <max@sdn.clinic>
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@ -11,7 +11,7 @@ interfaces are configured. The file is processed by *ifquery*(8),
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*ifup*(8) and *ifdown*(8) to introspect and change system state.
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In most cases, syntax from legacy implementations is supported as
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well, but that syntax is not discussed here.
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well, but that syntax is not discussed in detail here.
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# FILE SYNTAX
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@ -24,6 +24,8 @@ value combination that is related to an *object*. Triples which
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are not associated with an *object* are considered to be part
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of the root of the configuration tree.
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All keywords are case-sensitive and are expected to be lower-case.
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The following is a simple example of a stanza:
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```
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@ -64,11 +66,11 @@ the system will only respond to certain keywords by default:
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*address* _address_
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Associates an IPv4 or IPv6 address in CIDR notation with
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the parent interface.
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*gateway* _address_
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Associates an IPv4 or IPv6 address with the parent interface
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for use as a default route (gateway).
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the parent interface. If an IP address without a prefix
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length is given a given _netmask_ attribute is used if present.
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If neither a prefix length nor a _netmask_ are given a /24 or /64
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prefix length is presumed for IPv4 / IPv6 as of compatibility
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reasons to classic ifupdown.
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*netmask* _netmask_
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Associates a fallback netmask with the parent interface for
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@ -83,6 +85,11 @@ the system will only respond to certain keywords by default:
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For compatiblity with ifupdown and ifupdown2, _pointopoint_ is
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an alias for this parameter.
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*gateway* _address_
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Associates an IPv4 or IPv6 address with the parent interface
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for use as a default route (gateway). This usually is given
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once for IPv4 and once for IPv6 (in a Dual-Stack setup).
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*link-type* _link-type_
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Denotes the link-type of the interface. When set to _dummy_,
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the interface is created as a virtual dummy interfaces.
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