Description
This article shows how to configure the gateway for DHCP and PPPOE SDWAN members.
Solution
Configuration example:
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config system interface
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edit "wan1"
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set vdom "root"
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set mode dhcp
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set allowaccess ping fgfm
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set type physical
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set role wan
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set snmp-index 1
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next
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end
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If an interface is configured to use DHCP or PPOE and added to an SD-WAN interface, select “Dynamic” for Gateway, as the gateway is learned dynamically through the dhcp process.
The SD-WAN member configuration should be
Through CLI
config system virtual-wan-link
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config members
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edit 1
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set interface "wan1"
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next
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end
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!!! Extra caution should be taken if the DHCP interface is added first and is the only underlay interface, as adding the DHCP interface as a SDWAN member will erase the dynamically added default route added through the DHCP process – to overcome this, before adding the DHCP interface as a SDWAN member, you need to add a default static route pointing to the DHCP interface:
CLI:
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config router static
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edit 1
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set device "wan1"
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set dynamic-gateway enable
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next
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end
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After adding the DHCP interface to SDWAN, you can modify the created default static route to use the SDWAN interface - SDWAN interface cannot be used in routing before adding a member
