The DHCP client cannot obtain DNS information on the AR

DPossible causes are as follows:
1. The route from the AR to the DHCP server is unreachable.
2. The DNS and DHCP configuration modes are different.
When the DHCP server assigns an IP address and gateway address to a client, the DHCP server also sends the DNS server address to the client. Ensure that the DNS server address and DHCP server address are configured in the global address pool or on an interface so that the DHCP server can find the DNS server IP address and deliver it.

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