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Update dhcp-relay.rst (#729)

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* Update dhcp-relay.rst

Include info that all participating interfaces must be defined; https://forum.vyos.io/t/dhcp-relay-uplink-interface/8542

* Update dhcp-relay.rst

Fix lines too long.
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Thomas Jensen 2022-03-07 20:09:25 +01:00 committed by GitHub
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11
docs/configuration/service/dhcp-relay.rst
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@ -8,7 +8,8 @@ If you want your router to forward DHCP requests to an external DHCP server
you can configure the system to act as a DHCP relay agent. The DHCP relay you can configure the system to act as a DHCP relay agent. The DHCP relay
agent works with IPv4 and IPv6 addresses. agent works with IPv4 and IPv6 addresses.
All interfaces used for the DHCP relay must be configured. All interfaces used for the DHCP relay must be configured. This includes the
uplink to the DHCP server.
********** **********
IPv4 relay IPv4 relay
@ -19,7 +20,8 @@ Configuration
.. cfgcmd:: set service dhcp-relay interface <interface> .. cfgcmd:: set service dhcp-relay interface <interface>
Enable the DHCP relay service on the given interface. Interfaces that participate in the DHCP relay process, including the uplink
to the DHCP server.
.. cfgcmd:: set service dhcp-relay server <server> .. cfgcmd:: set service dhcp-relay server <server>
@ -67,9 +69,9 @@ Example
======= =======
* Listen for DHCP requests on interface ``eth1``. * Listen for DHCP requests on interface ``eth1``.
* DHCP server is located at IPv4 address 10.0.1.4. * DHCP server is located at IPv4 address 10.0.1.4 on ``eth2``.
* Router receives DHCP client requests on ``eth1`` and relays them to the server * Router receives DHCP client requests on ``eth1`` and relays them to the server
at 10.0.1.4. at 10.0.1.4 on ``eth2``.
.. figure:: /_static/images/service_dhcp-relay01.png .. figure:: /_static/images/service_dhcp-relay01.png
:scale: 80 % :scale: 80 %
@ -83,6 +85,7 @@ The generated configuration will look like:
show service dhcp-relay show service dhcp-relay
interface eth1 interface eth1
interface eth2
server 10.0.1.4 server 10.0.1.4
relay-options { relay-options {
relay-agents-packets discard relay-agents-packets discard