Do S series switches support DNS proxy

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S series switches (excluding the S1700) support only the DNS client function. Static and dynamic domain name resolution can be used together. When resolving the domain name, the switch first uses static domain name resolution. The switch queries the local static domain name resolution table. If static domain name resolution fails, the switch uses dynamic domain name resolution. The switch sends a DNS request to the DNS server. Dynamic domain name resolution takes some time and requires the DNS server. You can add some common domain names to the static domain name resolution table to improve the resolution efficiency.
Huawei S series switches support static and dynamic domain name resolution. The configuration procedure is as follows:
1. Configure the static domain name resolution.
[Huawei] ip host hostB 10.4.1.1 //Configure a static DNS entry.
2. Configure dynamic domain name resolution.
[Huawei] dns resolve //Enable dynamic DNS resolution.
[Huawei] dns server 10.3.1.2 /Configure the DNS server's IP address.
[Huawei] dns domain net //Configure the DNS domain name suffix.

Other related questions:
Proxy ARP support on S series switches
Proxy ARP support on S series switches is as follows: # Routed proxy ARP: In versions earlier than V200R005, this feature is supported by all models except the S275x or S5700LI. In V200R005 and later versions, this feature is supported by all models. # Intra-VLAN proxy ARP: In versions earlier than V200R005, this feature is supported by all models except the S275x or S5700LI. In V200R005 and later versions, this feature is supported by all models. # Inter-VLAN proxy ARP: This feature is supported by all models except S1720, S2720, S275x, and S5700LI of S series fixed switches.

Does the device support DNS proxy
The device supports DNS proxy. The DNS proxy forwards DNS request and response packets between a DNS client and DNS server. The DNS client on a LAN considers the DNS proxy as the DNS server and sends DNS request packets to the DNS proxy. The DNS proxy forwards DNS request packets to the DNS server, and sends DNS response packets from the DNS server to the DNS client, to implement domain name resolution. When the DNS server's IP address changes, you only need to change the DNS proxy configuration without changing the configuration of each DNS client. This simplifies network management.

Differences between the smart DNS and the transparent DNS proxy supported by the USG6000
The USG6000 supports the smart DNS and the transparent DNS proxy. The same points are as follows: (1) Both the smart DNS and the transparent DNS proxy provide the DNS service. (2) Both the smart DNS and the transparent DNS proxy provide appropriate access paths for users by means of interfering DNS behaviors. (3) Both the smart DNS and the transparent DNS proxy are implemented by the firewall (non-DNS server). The differences are as follows: (1) The application scenarios of the smart DNS and the transparent DNS proxy are different. The transparent DNS proxy is used to control the path used by users inside the enterprise zone to access external network resources and aims to improve the bidirectional outbound interface bandwidth usage; the smart DNS is used to control the path used by users outside the enterprise zone (Internet users) to access the internal servers and aims to select the shortest path to avoid inter-ISP access. (2) Locations of DNS servers are different. The DNS server of the transparent DNS proxy is deployed at the ISP side, and the DNS server of the smart DNS is deployed at the enterprise side. (3) User locations, accessed resource locations, and access directions are different.

DNS configuration on S series switch
S series switches (except S1700 switches) support only configuration of the DNS client. There are two DNS resolution modes: static and dynamic. The two modes can be used together. The switch first uses static DNS resolution (by searching the local static domain name resolution table). If static DNS resolution fails, the switch uses dynamic DNS resolution (by sending a DNS resolution request to the DNS server). Dynamic DNS resolution takes a period of time and requires cooperation from the DNS server. You can add common domain names to the static domain name resolution table to improve the efficiency of resolving domain names. To enable static and dynamic DNS resolution on S series switches, perform the following configuration: 1. Configuration of static DNS resolution [Huawei] ip host hostB 10.4.1.1 //Configure a static DNS entry. 2. Configuration of dynamic DNS resolution [Huawei] dns resolve //Enable dynamic DNS resolution. [Huawei] dns server 10.3.1.2 //Set the IP address of the DNS server. [Huawei] dns domain net //Configure the DNS domain name.

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