What is the difference between Easy IP and address pool

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The differences between NAT and easy IP are as follows:
- When Easy IP is used, the interface IP address is used as the mapped public IP address.
- When the address pool is used, the public address pool needs to be configured. The public address that maps the private address is selected from the public address pool.
When a user accesses the public network through NAT, use either of the following modes based on the IP plan of the public network:
- When the IP address of the outbound interface and other applications are configured on the NAT device, if there are idle public IP addresses, use the address pool mode.
- When the IP address of the outbound interface and other applications are configured on the NAT device, if there are no idle public IP addresses, use the Easy IP mode.

Other related questions:
Relationship between a secondary IP address and an OSPF IP address
They are actually the same address. A secondary address is usually referred to as an OSFP IP address on the NMS.

How is IP address range increased on an AR
When addresses in the address pool are insufficient, use the following methods:
- Increase the mask.
[Huawei] ip pool global1
[Huawei-ip-pool-global1] undo network
[Huawei-ip-pool-global1] network 192.168.0.0 mask 16 //Change the mask from 24-bit mask 255.255.255.0 to 16-bit mask 255.255.0.0.
There are great changed. The mask on the DHCP client needs to be changed to 16-bit.
- Create an address pool and configure the primary address of the interface as the address on the network segment.
[Huawei] ip-pool new_p //Create an address pool.
[Huawei-ip-pool-new_p] network 192.168.2.0 mask 255.255.255.0
[Huawei-ip-pool-new_p] quit
[Huawei] interface gigabitethernet1/0/0
[Huawei-GigabitEthernet1/0/0] ip address 192.168.2.1 255.255.255.0 //Configure the same network segment of new addresses as that of the primary IP address.
[Huawei-GigabitEthernet1/0/0] ip address 192.168.1.1 255.255.255.0 sub //Configure the same network segment of new addresses as that of the secondary IP address.
Automatically allocated addresses are addresses on the new network segment.

Reset an IP address pool
You can manually reclaim IP addresses that fail to be released due to exceptions after they are allocated by a DHCP server. 
If an IP address conflict occurs because an IP address is allocated to two clients, run the following command to reset the conflicting IP address: 
<HUAWEI> reset ip pool name pool1 conflict

Difference between forwarding modes of Layer 2 multicast on an S series switch
After Layer 2 multicast is enabled on an S series switch, the switch maintains a Layer 2 multicast forwarding table. When receiving a multicast packet, the switch matches the multicast address of the packet with multicast forwarding entries to determine the outbound interface. Whether the switch determines the outbound interface based on the multicast IP address or multicast MAC address depends on the configured Layer 2 multicast forwarding mode. Multiple multicast IP addresses may be mapped to one MAC address. If multicast data is forwarded based on the MAC address, multicast data may be sent to the users who do not order the multicast data. MAC address-based multicast forwarding can improve specifications in certain scenarios. Different models support different Layer 2 multicast forwarding modes: - The S1720, S2700SI, S2710SI, S2700EI, S2720, S2750EI, S5700S-LI, and S5700LI support only MAC address-based multicast forwarding. - The S3700SI and S5710-C-LI support only IP address-based multicast forwarding. - The S5700SI supports only IP address-based multicast forwarding in V200R002 and earlier versions, and supports MAC address-based and IP address-based forwarding modes starting from V200R003. - The S3700EI, S3700HI, S5710-X-LI, S5720S-SI, S5720SI, S5700EI, S5710EI, S5720EI, S5700HI, S5710HI, S5720HI, S6700EI, S6720EI, S7700, S9700, S12700, S9300, and E600 support MAC address-based and IP address-based forwarding modes.

Reclaim IP addresses on S series switch
On S series switches except S1700 switches, IP addresses that fail to be released in an IP address pool can be reclaimed. The reclaimed IP addresses enter the idle state and can be assigned to clients again. The reset ip pool { interface pool-name | name ip-pool-name } { start-ip-address [ end-ip-address ] | all | conflict | expired | used } command reclaims the conflicting, expired, and used IP addresses.
For example, you can reclaim IP address 10.1.1.5 that has been assigned to a client and bound to the client's MAC address as follows:
- For a global address pool:
<HUAWEI> reset ip pool name pool1 used //Reclaim the IP addresses in use.
<HUAWEI> system-view   //If an IP address is not bound to any MAC address, skip the following operation.
[HUAWEI] ip pool pool1
[HUAWEI-ip-pool-pool1] undo static-bind ip-address 10.1.1.5 //Unbind the IP address from the MAC address.
- For an interface address pool:
<HUAWEI> reset ip pool interface vlanif100 used //Reclaim the IP addresses in use.
<HUAWEI> system-view   //If an IP address is not bound to any MAC address, skip the following operation.
[HUAWEI] interface vlanif 100  
[HUAWEI-Vlanif100] undo dhcp server static-bind ip-address 10.1.1.5  //Unbind the IP address from the MAC address.
After the preceding commands are executed, a user may be disconnected if its IP address is within the address range specified in this command.

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