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This project follows Semantic Versioning.

v0-13-3-2023-06-10

[v0.13.3] - 2023-06-10

• Changed
  • Sort dhcpd options so their order doesn't change in configuration files made by OTP 26. This fixes regression test failures that expected the files to by the same. It shouldn't matter for real use, but it's nice that the files are deterministic just in case.
  • Ignore unexpected messages to the InterfacesMonitor. This fixes an unnecessary crash/restart that was seen. Errors are still logged.

v0-13-2-2023-05-15

[v0.13.2] - 2023-05-15

• Changed
  • Always set IPv4 broadcast address for static IPv4 configurations. This fixes an issue where the default for subnet broadcast address was not the expected host all-ones address per RFC 922.
  • Prune out LAN addresses when trying to detect Internet connectivity. This fixes one way that the Internet checker could be tricked by a captive portal that resolves all DNS queries to its portal address.
  • Fix confusion with :dhcpd :subnet option. This maps to the subnet mask field when responding to DHCP requests. The word "subnet" was interpreted as a subnet which was incorrect for this. :netmask is now an alias and examples are fixed.

v0-13-1-2023-03-15

[v0.13.1] - 2023-03-15

This release fixes deprecation warnings when using Elixir 1.15.

v0-13-0-2023-01-22

v0.13.0 - 2023-01-22

This release has a breaking change if you're using the UdhcpcHandler behaviour. This should be a rare use case. Use the "dhcp_options" property now.

• Changed
  • Add "dhcp_options" to interface properties. This lets applications use information provided by DHCP servers in an easy way. It removes the need to process events from udhcpc directly, and therefore, the UdhcpcHandler behaviour is now a private API and may be removed in the future.
  • Fix some references to iodata that should have been chardata.

v0-12-2-2022-08-04

v0.12.2 - 2022-08-04

• Changed
  • Add VintageNet.info_as_ansidata/1. This lets you get the same results as VintageNet.info, but in a way that's easy to put on a web page or send to a server, etc.
  • Support updating network configuration even when it can't be persisted. Previously if there was an error saving the configuration and persist: true (the default), the configuration wouldn't be applied. This turned out to be problematic when trying to get some devices fixed. Now the device won't have the right config on reboot, but it can be reached over the network to be fixed.

v0-12-1-2022-06-01

v0.12.1 - 2022-06-01

• Changed
  • The list of name servers that VintageNet uses when configuring the name resolve is now available by running VintageNet.get(["name_servers"]).

v0-12-0-2022-04-27

v0.12.0 - 2022-04-27

This release has two potentially breaking changes:

1. Elixir 1.11 is now the minimum supported Elixir version.
2. VintageNet.PropertyTable has been extracted to its own library and is now just PropertyTable. Most users did not use VintageNet.PropertyTable directly, but if you did, you'll need to update the references.

• Changed
  • Extract VintageNet.PropertyTable to its own library. Note that many improvements were made to PropertyTable including renaming functions for consistency and changing the events. Code was added to VintageNet to hide these changes for now. Longer term, we'll be making things more consistent, but the hope is that the PropertyTable changes are transparent to VintageNet users in this release.
  • Support specifying absolute paths to network configuration commands. While this is not preferred, it's useful in some scenarios.
  • Redact more kinds of secrets in VintageNet.info

v0-11-5-2022-02-18

v0.11.5 - 2022-02-18

• Changed
  • Fix a no function clause exception in the InternetChecker that could happen if no IP addresses were assigned to an interface.

v0-11-4-2021-12-20

v0.11.4 - 2021-12-20

• Changed
  • Internet connectivity checks can now take domain names. Previously only IP addresses were supported. This change lets you add your own servers to the list since those servers may be more reliable indicators of Internet access in highly firewalled locations. A section on this was added to the README.md with an example.

v0-11-3-2021-11-18

v0.11.3 - 2021-11-18

• Changed
  • Don't downgrade the connection status on DHCP renewals. Previously, if there was a DHCP renewal, the connection status could go from "Internet-connected" "LAN-connected". The logic was that IP address and router changes may make the Internet unreachible. The new logic is to assume that the device is still Internet-connected and let the connectivity checker downgrade the status should it be necessary. This not only removes a status hiccup, but also fixes a race between the connectivity checker upgrading the connection and the DHCP notification degrading it.
  • Improve the VintageNet.info error when the :vintage_net application stops.

v0-11-2-2021-10-25

v0.11.2 - 2021-10-25

• Added
  • Added VintageNet.RouteManager.refresh_route_metrics/0 to recompute the routing table metrics. This is useful if you're supplying your own :route_metric_fun and something has changed to make it return a different prioritization. Thanks to @LostKobrakai for this feature.

v0-11-1-2021-10-01

v0.11.1 - 2021-10-01

• Changed
  • The DNS server ordering is more deterministic now. Global DNS servers are guaranteed to be listed first and in the order specified. VintageNet will also try to preserve the ordering of DNS servers learned through DHCP. This isn't always possible, though. This fixes a hard-to-find error where an a difference in DNS server orderings between to device locations led to different behavior.
  • Use VintageNet.ConnectivityChecker.* in VintageNet. The connectivity checker module change was half made in v0.11.0, but the old module name was kept in a couple places to avoid breaking unit tests in other VintageNet libraries. Now it's completely converted. This doesn't affect runtime. Code that references the previous names will still get deprecation warnings like in v0.11.0.

v0-11-0-2021-08-19

v0.11.0 - 2021-08-19

This release should be a safe update for most users. Many routing table and internet connectivity check modules were updated, but the changes were primarily in private APIs.

• Added

  • Support for detecting Internet connectivity on an interface passively by watching tx and rx stats on TCP sockets. For example, if you have a long-lived TCP connection (like for MQTT), the keepalive messages will bump tx and rx counters that will let VintageNet skip testing the connection for connectivity. This reduces traffic on metered connections.
  • Support for completely overriding route metric calculation. You can now specify a :route_metric_fun instead of using the DefaultMetric calculator for determining which network interface preferences.
  • VintageNet property change events now come with timestamps. These are useful for computing state durations and other time-based stats for events.

• Removed

  • Support for setting route prioritization order. This feature was more limiting that it originally looked. The new :route_metric_fun is more straightforward since it lets you explicitly specify orderings and lets decisions be made based on more input data.

• Changed

  • VintageNet.Interface.InternetConnectivityChecker is now VintageNet.Connectivity.InternetChecker. Please update any references. Old references will continue to work, but give a deprecation message at runtime.

v0-10-5-2021-07-12

v0.10.5 - 2021-07-12

This release only contains build system and hex package update. It doesn't change any code and is a safe update.

v0-10-4-2021-07-06

v0.10.4 - 2021-07-06

• Fixed
  • DHCP renewals would bounce connection status from :internet to :lan and back even when the IP address, subnet, and default gateway didn't change. This could cause a network connectivity hiccup that would happen every 24 hours (a common DHCP lease time). A fix was added to assume internet connectivity was maintained if the DHCP renewal didn't change IP parameters.

v0-10-3-2021-06-22

v0.10.3 - 2021-06-22

• Fixed
  • Fix regression with tracking udhcpd lease notifications. Leases notifications were being ignored, so if you were monitoring leases to see who was connected, then you wouldn't see any connections without this fix. Thanks to Jon Thacker for reporting this issue.
  • Fix crashes when the application config is invalid. While the configurations were incorrect and needed to be fixed, it was harder to debug than it should have been. This release logs messages on invalid configs and carries on bringing up left that's valid. Thanks to Matt Ludwigs for this fix.

v0-10-2-2021-05-20

v0.10.2 - 2021-05-20

This release officially removes support for Elixir 1.7 and Elixir 1.8. It turns out that those versions wouldn't have worked in v0.10.0 due to a dependency that was added.

• Added
  • Add VintageNet.reset_to_defaults/1 so that it's easy to reset a network interface's configuration to what it would be if VintageNet.configure had never been called. The previous "easy" way of doing this was to erase the persisted configuration file and reboot.
  • Clean up interface reachability handling (disconnected vs. lan-connected vs internet-connected). There was an issue where the status was out of sync due a bug in a technology implementation. This is harder to do now. IMPORTANT: if you have a custom technology implementation, calling VintageNet.RouteManager.set_connection_status is sufficient. You no longer need to update the status property for your interface. This is not a common need.

v0-10-1-2021-05-06

v0.10.1 - 2021-05-06

• Added
  • There's now an :additional_name_servers global configuration key so that it's possible to force name servers to always be in the list to use. For example, if you don't trust that you'll always get good name servers from DHCP, you can add a few public name servers to this list.
  • /etc/resolv.conf now has nice comments on where configuration items come from. Thanks to Connor Rigby for this idea and implementation.

v0-10-0-2021-04-06

v0.10.0 - 2021-04-06

This release is mostly backwards compatible. If you have created your own VintageNet technology, you may need to update your unit tests. If you are an end user of VintageNet, your code should continue to work unmodified.

• Added

  • The Internet connectivity check logic now supports a list of IP addresses instead of just one. The default has been updated to include major public DNS providers. The code checks them in succession until one responds. See :internet_host_list config key in the README.md if you need to change it.
  • Only start udhcpc/udhcpd when the network interface is up. This removes pointless attempts to get an IP address and their associated logs. It reduces connection time for wired Ethernet but doesn't affect WiFI.

• Fixed

  • Replace Crypto API calls that are no longer included with OTP 24.
  • Redact SAE passwords

v0-9-3-2021-02-03

v0.9.3 - 2021-02-03

• Fixed
  • Be more robust to PowerManager.init/1 failures. While this function shouldn't raise, the effect of it raising was particularly destructive to VintageNet and took down networking.
  • Update gen_state_machine dependency to let the 3.0.0 release be used.

v0-9-2-2020-10-10

v0.9.2 - 2020-10-10

• Fixed
  • Handle missing commands as errors rather than raising. This makes it a little easier test vintage_net and libraries that use it.
  • Fixes @doc tag warnings during compile time

v0-9-1-2020-07-29

v0.9.1 - 2020-07-29

• Fixed
  • This fixes an issue where system networking binaries were not being resolved according to vintage_net's view of the PATH. vintage_net looks in the standard directories by default, but it's possible to restrict or add locations.

v0-9-0-2021-07-24

v0.9.0 - 2021-07-24

This release contains improvements that will not affect you unless you are using a custom VintageNet.Technology implementation.

• Added

  • Add power management support. This adds support for powering on and off network devices and also enables VintageNet to restart devices that are not working (if allowed). See VintageNet.PowerManager for details.

• Changed

  • Paths to networking programs like wpa_supplicant are no longer passed as opts during configuration. I.e., :bin_wpa_supplicant, :bin_ip, etc. This was not a generally useful feature since it wasn't possible to include all possible programs. A future plan is to add support for verifying that networking programs exist before trying to configure an interface. Programs should be passed as strings now.
  • Support for the :busybox hex package has been removed. This was useful when networking programs were unavailable on a system, but all official Nerves systems have included them for the past year and :busybox required maintenance to keep working and up-to-date.

v0-8-0-2020-05-29

v0.8.0 - 2020-05-29

• Added

  • [Breaking change for technology implementors] Decouple the network interface name from the one a network technology uses. For example, cellular modems can now have vintage_net wait for wwan0 to appear before setting up a PPP interface (like ppp0). All network technology implementations need to be updated to provide RawConfigs that list the network interfaces they need to start. This is hard to miss since you'll get a compile error if it affects you.
  • Deterministic interface naming support - If you have a device with multiple network interfaces of the same type (e.g., multiple WiFi adapters) it is possible for them to switch between being assigned wlan0 and wlan1 under some conditions. This feature allows you to map their hardware location to a name of your choosing. See the README.md for details.
  • Add the "hw_path" property - For example, {["interface", "eth0", "hw_path"], "/devices/platform/ocp/4a100000.ethernet"}

• Fixed

  • Stop network interface management GenServers before running the "down" commands. This is most noticeable in reduced log noise on network hiccups and device removals.

v0-7-9-2020-04-07

v0.7.9 - 2020-04-07

• Fixed
  • Fix IP address being reported for PPP connections. Previously, it was the remote end of the PPP connection rather than the local end.
  • Fix missing IPv6 address reports. Depending on when IPv6 addresses were set on network interfaces, they might not have been reported. Note that IPv6 isn't officially supported by VintageNet yet.

v0-7-8-2020-04-03

v0.7.8 - 2020-04-03

• Added

  • Store an interface's configuration in the ["interface", ifname, "config"] property. This makes it possible to subscribe to configuration changes (like any other property).
  • Print out IP addresses with VintageNet.info/0

• Fixed

  • Fixed VintageNet.get_configuration/1 to return the configuration that will be applied even if it's not the configuration that's currently applied. The previous semantics would break code that made decisions based on the current configurations.

v0-7-7-2020-03-23

v0.7.7 - 2020-03-23

• Added
  • Added time-in-state to VintageNet.info. This lets you see if a connection has bounced at a glance without digging through the logs.

v0-7-6-2020-03-18

v0.7.6 - 2020-03-18

• Fixed
  • Ensure that Technology.normalize/1 is always called. Previously, this wasn't guaranteed, and it could result in a surprise when an unnormalized configuration got saved.
  • Remove duplicate resolv.conf entries on multi-homed devices
  • Fix warnings found by Elixir 1.10

v0-7-5-2020-02-10

v0.7.5 - 2020-02-10

• Fixed
  • Fix routing table error when configuring multiple interfaces of the same type.
  • Fix VintageNet.info for when it's called before vintage_net is loaded.

v0-7-4-2020-01-22

v0.7.4 - 2020-01-22

• Fixed
  • Fix VintageNet.info crash when displaying AP mode configurations
  • Save configurations using the :sync flag to reduce the chance that they're lost on ungraceful power offs. I.e., people pulling the power cable after device configuration.

v0-7-3-2020-01-21

v0.7.3 - 2020-01-21

• Added
  • Scrub VintageNet.info/0 output to avoid accidental disclosure of WiFi credentials
  • Support options to deconfigure/2 to mirror those on configure/2
  • Prefix udhcpc logs with interface to more easily blame problematic networks
  • Support IPv4 /32 subnets
  • Various documentation fixes and improvements

v0-7-2-2019-12-20

v0.7.2 - 2019-12-20

• Bug fix
  • Remove noisy log message introduced in v0.7.1

v0-7-1-2019-12-20

v0.7.1 - 2019-12-20

This release fixes an issue where the Internet-connectivity checking code could crash. It was automatically restarted, but that had a side effect of delaying a report that the device was connected AND breaking mdns_lite. Both the crash and the restart issue were fixed. The mdns_lite side effect was due to its multicast group membership being lost so this would affect other multicast-using code.

• Fixed

  • Fix :timeout_value crash in the InternetConnectivityChecker
  • Force clear IPv4 addresses when the DHCP notifies a deconfig event. This occurs on a restart and is quickly followed by a renew. However, if applications don't see this, bounce and don't register their multicast listeners on affected IPv4 address again, they'll lose the subscription.

• Added

  • Added check for nerves_network and nerves_init_gadget. If your project pulls these in, it will get a moderately friendly notice to remove them.

v0-7-0-2019-12-09

v0.7.0 - 2019-12-09

This release moves network technology implementations (WiFi, wired Ethernet, etc.) into their own projects. This means that they can evolve at their own pace. It also means that we're finally ready to support the VintageNet.Technology behaviour as part of the public API so that VintageNet users can add support for network technologies that we haven't gotten to yet.

IMPORTANT: This change is not backwards compatible. You will need to update existing projects to bring in a new dependency. The runtime is backwards compatible. I.e., If you have a networking configuration saved in VintageNet, it will be updated on load. It won't be re-saved, so if you need to revert an update, it will still work. The next save, though, will use the new naming.

If you're using VintageNet.Technology.Gadget, do the following:

1. Add {:vintage_net_direct, "~> 0.7.0"} to your mix.exs dependencies. You'll notice that references to "gadget" have been replaced with the word "direct". We think the new naming is more accurate.
2. Replace all references to VintageNet.Technology.Gadget in your code to VintageNetDirect. Be aware of aliases and configuration.
3. If you passed options when configuring the network, the :gadget key is now :vintage_net_direct. Most users don't pass options.

If you're using VintageNet.Technology.Ethernet, do the following:

1. Add {:vintage_net_ethernet, "~> 0.7.0"} to your mix.exs dependencies.
2. Replace all references to VintageNet.Technology.Ethernet in your code to VintageNetEthernet. Be aware of aliases and configuration.

If you're using VintageNet.Technology.WiFi, do the following:

1. Add {:vintage_net_wifi, "~> 0.7.0"} to your mix.exs dependencies.
2. Replace all references to VintageNet.Technology.WiFi in your code to VintageNetWiFi. Be aware of aliases and configuration. Also, the "F" is capital.
3. The :wifi key in the network configuration is now :vintage_net_wifi.

v0-6-6-2019-12-01

v0.6.6 - 2019-12-01

• Fixed

  • Fix warning from Dialyzer when making wild card subscriptions. Code was also added to more thoroughly validate properties paths to raise on subtle issues that won't do what the programmer intends.

• Added

  • Added VintageNet.match/1 to support "gets" on properties using wildcards.

v0-6-5-2019-11-22

v0.6.5 - 2019-11-22

• Added
  • Support wild card subscriptions to properties. This makes it possible to subscribe to things like ["interface", :_, "addresses"] where the :_ indicates that any value in the second position should match. That particular subscription would send a message whenever an IP address anywhere gets added, changed, or removed.

v0-6-4-2019-10-31

v0.6.4 - 2019-10-31

• Added
  • Added the ["interface", ifname, "eap_status"] property for EAP events. EAP is currently only supported on WiFi, but is anticipated for wired Ethernet too.

v0-6-3-2019-10-28

v0.6.3 - 2019-10-28

This release renames the WiFi mode names. The old names still work so it's a backwards compatible update. The new names are :ap and :infrastructure instead of :host and :client. These names match the mode names in the IEEE specifications and usage elsewhere.

• Added
  • Support static IPv4 configurations for a default gateway and list of name resolvers. See :gateway and :name_servers parameters.
  • Support ad-hoc WiFi networking (IBSS mode)

v0-6-2-2019-10-11

v0.6.2 - 2019-10-11

• Added
  • Support running a simple DNS server on an interface. This was added for WiFi AP mode configuration and could be useful for other scenarios.
  • Support DHCP server response options
  • Support disabling configuration persistence on a per-call basis. This is for temporary configurations where a reboot should not preserve the setting. For example, VintageNet.configure("wlan0", config, persist: false)

v0-6-1-2019-10-02

v0.6.1 - 2019-10-02

• Added
  • Add a current_ap property for WiFi interfaces so that programs can get information about the currently associated access point
  • Support running a DHCP server on wired Ethernet interfaces
  • Expose VintageNet.WiFi.WPA2.validate_passphrase/1 so that applications can reuse the WiFI passphrase validation logic. This logic follows IEEE Std 802.11i-2004 and validates things like proper length and character set

v0-6-0-2019-09-25

v0.6.0 - 2019-09-25

IMPORTANT: This release contains a LOT of changes. VintageNet is still pre-1.0 and we're actively making API changes as we gain real world experience with it. Please upgrade carefully.

• Changed

  • All IP addresses are represented as tuples. You can still specify IP addresses as strings, like "192.168.1.1", but it will be converted to tuple form. When you get the configuration, you'll see IP addresses as tuples. This means that if you save your configuration and revert to a previous version of VintageNet, the settings won't work.
  • WiFi network configuration is always under the :networks key. This was inconsistent. Configuration normalization will update old saved configurations.
  • Support for the IPv4 broadcast IP address has been removed. Existing support was incomplete and slightly confusing, so we decided to remove it for now.
  • All IP address subnets are represented by their prefix length. For example, 255.255.255.0 is recorded as a subnet with prefix length 24. Configuration normalization converts subnet masks to prefix length now.

• Added

  • USB gadget support - See VintageNet.Technology.Gadget. It is highly likely that we'll refactor USB gadget support to its own project in the future.
  • Add :verbose key to configs for enabling debug messages from third party applications. Currently :verbose controls debug output from wpa_supplicant.
  • Allow users to pass additional options to MuonTrap so that it's possible to run network daemons in cgroups (among other things)

• Fixed

  • Networking daemons should all be supervised now. For example, udhcpc previously was started by ifup and under many conditions, it was possible to get numerous instances started simultaneously. Plus failures weren't detected.
  • No more killall calls to cleanup state. This had prevented network technologies from being used on multiple interfaces.
  • No more ifupdown. This was very convenient for getting started, but has numerous flaws. Search the Internet for rants. This was replaced with direct calls to ip link and ip addr and adding network daemons to supervision trees.

• Known issues

  • Static IP addressing is still not implemented. It's only implemented enough for WiFi AP mode and USB gadget mode to work. We hope to fix this soon.
  • It's not possible to temporarily configure network settings. At the moment, if persistence is enabled (the default), configuration updates are always saved.

v0-5-1-2019-09-03

v0.5.1 - 2019-09-03

• Fixed

  • Add missing PSK conversion when configuring multiple WiFi networks. This fixes a bug where backup networks wouldn't connect.

• Added

  • Don't poll WiFi networks that are configured for AP mode for Internet. They will never have it.
  • Reduce the number of calls to update routing tables. Previously they were unnecessarily updated on DHCP failures due to timeouts. This also removes quite a bit of noise from the log.
  • Filter out interfaces with "Null" technologies on them from the configured list. They really aren't configured so it was confusing to see them.

v0-5-0-2019-08-08

v0.5.0 - 2019-08-08

Backwards incompatible change: The WiFi access point property (e.g., ["interfaces", "wlan0", "access_points"]) is now a simple list of access point structs. It was formerly a map and code using this property will need to be updated.

v0-4-1-2019-07-29

v0.4.1 - 2019-07-29

• Added
  • Support run-time configuration of regulatory domain
  • Error message improvement if build system is missing pkg-config

v0-4-0-2019-07-22

v0.4.0 - 2019-07-22

Build note: The fix to support AP scanning when in AP-mode (see below) required pulling in libnl-3. All official Nerves systems have it installed since it is required by the wpa_supplicant. If you're doing host builds on Linux, you'll need to run apt install libnl-genl-3-dev.

• Added

  • Report IP addresses in the interface properties. It's now possible to listen for IP address changes on interfaces. IPv4 and IPv6 addresses are reported.
  • Support scanning for WiFi networks when an WiFi module is in AP mode. This lets you make WiFi configuration wizards. See the vintage_net_wizard project.
  • Add interface MAC addresses to the interface properties

• Fixed

  • Some WiFi adapters didn't work in AP mode since their drivers didn't support the P2P interface. Raspberry Pis all support the P2P interface, but some USB WiFi dongles do not. The wpa_supplicant interface code was updated to use fallback to the non-P2P interface in AP mode if it wasn't available.

v0-3-1-2019-06-28

v0.3.1 - 2019-06-28

• Added
  • Add null persistence implementation for devices migrating from Nerves Network that already have a persistence strategy in place

v0-3-0-2019-06-27

v0.3.0 - 2019-06-27

• Added

  • Support the busybox hex.pm package to bring in networking support if not present in the Nerves system image. This enables use with the minimal official Nerves images.
  • Add Unix domain socket interface to the wpa_supplicant. This enables much faster scanning of WiFi networks and other things like collecting attached clients when in AP-mode and pinging the supplicant to make sure it's running.
  • Log output of commandline-run applications so that error messages don't get lost.
  • Provide utilities for reporting WiFi signal strength as a percent to end users.

• Fixed

  • Support scanning WiFi access points with Unicode names (emoji, etc. in their SSIDs)
  • Allow internet connectivity pings to be missed 3 times in a row before deciding that the internet isn't reachable. This avoids transients due to the random dropped packet.
  • Reduce externally visible transients due to internal GenServers crashing and restarting - also addressed the crashes
  • Support configure while configuring - let's you cancel a configuration that takes a long time to apply and apply a new one

v0-2-4-2019-06-03

v0.2.4 - 2019-06-03

• Added
  • Listen for interface additions and physical layer notifications so that routing and status updates can be made much more quickly
  • Add lower_up to the interface properties

v0-2-3-2019-05-29

v0.2.3 - 2019-05-29

• Fixed
  • This release fixes supervision issues so that internal VintageNet crashes can be recovered
  • VintageNet.get_configuration/1 works now
  • "available_interfaces" is updated again

v0-2-2-2019-05-24

v0.2.2 - 2019-05-24

• Fixed
  • Fix local LAN routing

v0-2-1-2019-05-16

v0.2.1 - 2019-05-16

• Added
  • Expose summary status of whether the whole device is disconnected, LAN-connected, or Internet-connected

v0-2-0-2019-05-15

v0.2.0 - 2019-05-15

• Added

  • Support WiFi AP mode - see README.md for example

• Fixed

  • Alway update local routes before default routes to avoid getting errors when Linux detects a table entry that cannot be routed

v0-1-0

v0.1.0

Initial release to hex.