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docs: T9145: document WLB health script variables #2221

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4 changes: 3 additions & 1 deletion docs/configuration/loadbalancing/wan.md
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Expand Up @@ -174,7 +174,9 @@ type WLB test type
address or hostname.
- `test-script`: A user-defined script must return 0 to succeed and
non-zero to fail. Scripts reside in `/config/scripts`. For other locations,
provide the full path.
provide the full path. When the script runs, VyOS sets
`WLB_INTERFACE_NAME` to the interface under test. The same value is available
as `WLB_SCRIPT_IFACE` for backward compatibility.
- `ttl-limit`: For the UDP TTL limit test, specify the hop count limit.
The limit must be shorter than the path length. The test succeeds when an
ICMP time-expired message is returned. Default `1`.
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