/ip/dhcp-server/alert
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alert
Detects unknown (rogue) DHCP servers on an interface. The alert sends its own DHCPDISCOVER about once a minute, and checks the source of every DHCP reply it sees against valid-server. An unknown server is logged with...
ip/dhcp-server/alert
Type: Directory
Detects unknown (rogue) DHCP servers on an interface. The alert sends its own DHCPDISCOVER about once a minute, and checks the source of every DHCP reply it sees against valid-server. An unknown server is logged with the dhcp,critical topics, listed in unknown-server, and triggers on-alert. Because the alert sends DHCP requests itself, do not use it on an interface where the router runs a DHCP client. For details, see DHCP Server.
| Flag | Name | Description |
|---|---|---|
X | disabled | The alert is disabled. New alerts are created disabled. |
I | invalid | The alert configuration is invalid. |
| Argument | Type | Description |
|---|---|---|
interface * | iface_enum | Interface to watch for DHCP servers. |
valid-server | multi { mac-address: macAddr } | MAC addresses of the DHCP servers that are allowed on the interface. Replies from other servers raise an alert. |
on-alert | alt { script: string } | Script to run when an unknown DHCP server is detected. |
alert-timeout | alt { symbolic-names: enum (none) { none:0 } , time-interval: time } | Time after which a detected server is forgotten. If the server is still present afterwards, a new alert is raised. With none, detected servers are never forgotten. Default: 1h. |
| Read-only Argument | Type | Description |
|---|---|---|
unknown-server | multi { mac-address: macAddr } | MAC addresses of the unknown DHCP servers that were detected. |