Note
This is specific to my setup. Feel free to fork and change it, or send feature requests to make it more modular.
NAT failover is a system to workaround a flaky DHCP-PD (prefix delegation) system by temporarily adding a NATv6 Masquerade route when the block is not routed.
Uses a simple pinging system that test the connection through the default IP and one IP that is supposed to be routed.
If the first one succeeds and the second one fails, adds a NAT MASQUERADE rule on the WAN interface (but exclude the
IP to test). When the IP pings again, removes this rule.
It also pushes an alert directly to Alertmanager.
Install cargo through rustup.
Build the project by running:
cargo build --release
The binary should be built in the target/release/ directory.
Usage: nat-failover [OPTIONS] --iface <IFACE> --from <FROM> --alertmanager-url <ALERTMANAGER_URL>
Options:
-i, --iface <IFACE>
WAN interface
-f, --from <FROM>
IP to bind on
-t, --to <TO>
IP to ping [default: 2001:4860:4860::8888]
-r, --retries <RETRIES>
Retries [default: 5]
--timeout <TIMEOUT>
Timeout [default: 500]
--interval <INTERVAL>
Interval in seconds for the testing and apply or clean the failover [default: 15]
-a, --alertmanager-url <ALERTMANAGER_URL>
Alertmanager URL
-h, --help
Print help
-V, --version
Print version