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dhcp: T3841: add ping-check option

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Christian Poessinger 2021-09-19 11:23:49 +02:00
parent da8e41c20f
commit 7dca0ecce5
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31
docs/configuration/service/dhcp-server.rst
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@ -39,6 +39,21 @@ Configuration
Multiple DNS servers can be defined.
.. cfgcmd:: set service dhcp-server shared-network-name <name> ping-check
When the DHCP server is considering dynamically allocating an IP address to a
client, it first sends an ICMP Echo request (a ping) to the address being
assigned. It waits for a second, and if no ICMP Echo response has been heard,
it assigns the address.
If a response is heard, the lease is abandoned, and the server does not
respond to the client. The lease will remain abandoned for a minimum of
abandon-lease-time seconds (defaults to 24 hours).
If a there are no free addressses but there are abandoned IP addresses, the
DHCP server will attempt to reclaim an abandoned IP address regardless of the
value of abandon-lease-time.
Individual Client Subnet
-------------------------
@ -105,6 +120,22 @@ Individual Client Subnet
request where no full FQDN is passed. This option can be given multiple times
if you need multiple search domains (DHCP Option 119).
.. cfgcmd:: set service dhcp-server shared-network-name <name> subnet <subnet>
ping-check
When the DHCP server is considering dynamically allocating an IP address to a
client, it first sends an ICMP Echo request (a ping) to the address being
assigned. It waits for a second, and if no ICMP Echo response has been heard,
it assigns the address.
If a response is heard, the lease is abandoned, and the server does not
respond to the client. The lease will remain abandoned for a minimum of
abandon-lease-time seconds (defaults to 24 hours).
If a there are no free addressses but there are abandoned IP addresses, the
DHCP server will attempt to reclaim an abandoned IP address regardless of the
value of abandon-lease-time.
Failover
--------