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Configuration Guide - IP Service

S1720, S2700, S5700, and S6720 V200R012(C00 and C20)

This document describes the configurations of IP Service, including IP address, ARP, DHCP, DHCP policy VLAN, DNS, mDNS gateway, mDNS relay, UDP Helper, IP performance optimization, IPv6, DHCPv6, IPv6 DNS, IPv6 over IPv4 tunnel, and IPv4 over IPv6 tunnel.
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Planning Data

Planning Data

Planning DHCP Servers

A client broadcasts DHCP Discovery messages. When multiple DHCP servers (or DHCP relay agents) are deployed on a network segment, the client accepts only the first received DHCP Offer message and therefore may obtain an unexpected IP address. Planning DHCP servers ensures that a client obtains network parameters from an expected DHCP server.

Note the following during DHCP server planning:

  • Plan VLANs to ensure that only one DHCP server (or a DHCP relay agent) can receive DHCP Discovery messages in a VLAN.

  • Configure DHCP snooping on upstream access devices of clients to ensure that the clients can apply to the correct DHCP servers for network parameters. For details on how to configure DHCP snooping on the device, see DHCP Snooping Configuration in the S1720, S2700, S5700, and S6720 V200R012(C00&C20) Configuration Guide - Security.

Planning IP Addresses

  • Range of IP addresses that can be automatically allocated

    Plan an IP address range based on the number of concurrent online clients on the network. If the number of IP addresses in this range is too small, some clients cannot obtain IP addresses. If the number of IP addresses in this range is too large, IP address resources are wasted.

  • (Optional) IP addresses that cannot be automatically allocated

    Some IP addresses in an address pool are reserved for devices that require static IP addresses. For example, in an address pool ranging from to, is reserved for a DNS server. Exclude from the address pool to prevent the DHCP server from allocating to other clients.

  • IP address allocation

    DHCP supports dynamic and static IP address allocation mechanisms. Select one mechanism based on network requirements.

    • Dynamic allocation

      DHCP allocates an IP address with a limited validity period (known as a lease) to a client. Dynamic allocation applies to hosts that temporarily connect to a network with fewer IP addresses than the total number of hosts. For example, it can be used to allocate IP addresses to laptops used by employees on business trips or mobile terminals in cafes.

    • Static allocation

      DHCP allocates fixed IP addresses to specified clients with special IP address requirements. For example, the file server of an enterprise needs to use a fixed IP address to provide services for extranet users. Compared with manual IP address configuration, DHCP static allocation prevents manual configuration errors and helps network administrators perform unified maintenance and management.

Planning Other Network Parameters

DHCP servers can allocate IP addresses and other network parameters to DHCP clients. You can plan other network parameters as required. For example, to enable a client to communicate with other network devices through a domain name and obtain DNS parameters using DHCP, plan the DNS server IP address and domain name of the client.

Planning Leases

Plan an IP address lease for a client based on the online duration of the client. By default, the IP address lease is one day.

  • In scenarios where clients often move and stay online for a short period of time, for example, in cafes, airports, and hotels, plan a short-term lease to ensure that IP addresses are released quickly after the clients go offline.

  • In scenarios where clients seldom move and stay online for a long period of time, for example, in office areas of an enterprise, plan a long-term lease to prevent services from being affected by frequent lease or address renewals.

Updated: 2018-12-24

Document ID: EDOC1100038342

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