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83 lines
2.7 KiB
Markdown
83 lines
2.7 KiB
Markdown
# Static Network Configuration
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The default configuration provides multiple services that perform network
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initialization and static configuration using helper scripts that require
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programs from the `iproute2` package.
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Configuration files are typically stored in `/etc/netcfg/` (depending on
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configure options).
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Please note that the loopback device is treated specially and not included in
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any of the network configuration outlined below. The loopback device is brought
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up and configured by a dedicated service long before the network configuration
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is done.
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## Interface Renaming
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If the `ifrename` service is enabled (it is disabled by default), network
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interfaces are renamed based on a rule set stored in the file `ifrename`.
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The file contains comma separated shell globing patterns for the current
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interface name, MAC address and a prefix for the new interface name.
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For each network interface, rules are processed top to bottom. If the first two
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globing patterns apply, the interface is renamed. Interfaces with the same
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prefix are sorted by mac address and a running index is appended to the prefix.
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If none of the rules apply, the interface name is left unchanged.
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The intent is, to provide a way to configure persistent, deterministic names for
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at least all network interfaces that are permanently installed on a board.
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Extension cards or external network adapters should be given a different prefix
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to avoid changes in the order as they come and go.
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## Interface Configuration
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After interface renaming, for each network interface, the configuration path is
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scanned for files with the same name as the interface.
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Each successfully found configuration file is processed line by line, top to
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bottom. Each line may contain a keyword, followed by multiple arguments.
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The following keywords can be used to add IPv4 or IPv6 network addresses to
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an interface:
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* address
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* addr
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* ip
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* ip6
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* ipv6
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Those commands are expected to be followed by an IPv4 or IPv6 address and
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network mask.
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Furthermore, the following commands can be used for configuring interface
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parameters:
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* `arp {on|off}`
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* `multicast {on|off}`
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* `mtu <value>`
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* `offload [rx {on|off}] [tx {on|off}] [sg {on|off}] [tso {on|off}]`
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* `offload [gso {on|off}] [gro {on|off}] [lro {on|off}] [rxvlan {on|off}]`
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* `offload [txvlan {on|off}] [ntuple {on|off}] [rxhash {on|off}]`
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* `offload [ufo {on|off}]`
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## Route Configuration
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After interface configuration is done, routes and rules are restored from a
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file named `routes` in the same configuration path.
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The file may contain lines starting with `route` or `rule`. Everything that
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follows is passed on to `ip route add` or `ip rule add` respectively.
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## Net Filter Tables
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An additional service is provided that restores the nft rule set from
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`/etc/nftables.rules`.
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