IP Services
ARP
Context
On a local area network (LAN), a host or network device must learn the IP address of the destination host or device before sending data to it. Additionally, the host or network device must learn the physical address (MAC address) of the destination host or device because IP packets must be encapsulated into frames for transmission over a physical network. Therefore, the mapping from an IP address into a physical address is required. Address Resolution Protocol (ARP) is introduced to map IP addresses to physical addresses (Ethernet MAC addresses).
Procedure
- Create a static ARP entry.
- Click Create, as shown in Figure 5-97.
Table 5-56 describes parameters on the page.
Table 5-56 Creating a static ARP entryParameter
Description
Destination IP address
Enters the destination IP address, for example, 10.10.10.1.NOTE:This parameter cannot be set to the virtual IP address of a VRRP group configured on a VLANIF interface. Otherwise, an incorrect host route will be generated, causing forwarding errors.
Destination MAC address
Enters the Ethernet MAC address mapping the IP address, for example 0812-f231-05e1.
VLAN ID
Enters the VLAN ID corresponding to the IP address.NOTE:- If you enter a VLAN ID, the created ARP entry is in the specified VLAN.
- The VLANIF interface of the VLAN must be on the same network segment as the destination IP address.
Outbound interface
Clickto select the outbound interface of ARP packets, for example, GigabitEthernet1/0/1.
NOTE:The interface must be a member of the specified VLAN.
- Set the parameters.
The destination IP address and the IP address of the outbound interface must be on the same network segment.
- Click Create, as shown in Figure 5-97.
- Modify a static ARP entry.
- Click a destination IP address in the static ARP entry list to access the corresponding static ARP entry modification page, as shown in Figure 5-98.
Table 5-56 describes parameters on the page.
The destination IP address cannot be modified.
- Click a destination IP address in the static ARP entry list to access the corresponding static ARP entry modification page, as shown in Figure 5-98.
- Delete a static ARP entry.
- Choose to access the Static ARP page.
- Select a record that you want to delete and click Delete. The system asks you whether to delete the record.
- Click OK.
- Clear all static ARP entries.
- Choose to access the Static ARP page.
- Click Clear ALL Static ARP Entries. The system asks you whether to delete all static ARP entries.
- Click OK.
- Update a static ARP entry.
- Choose to access the Static ARP page.
- Click Refresh.
- Delete a dynamic ARP entry.
- Choose to access the Dynamic ARP page.
- Select a record that you want to delete and click Delete. The system asks you whether to delete the record.
- Click OK.
- Clear all dynamic ARP entries.
- Choose to access the Dynamic ARP page.
- Click Clear ALL Dynamic ARP Entries. The system asks you whether to delete all dynamic ARP entries.
- Click OK.
- Update a dynamic ARP entry.
- Choose to access the Dynamic ARP page.
- Click Refresh.
to select the outbound interface of ARP packets, for example, GigabitEthernet
ND
Context
To filter invalid packets, you can create ND entries, binding the destination IPv6 addresses of these invalid packets to nonexistent MAC addresses.
Procedure
- Create a static ND entry.
- Click Create, as shown in Figure 5-99.
Table 5-57 describes parameters on the page.
Table 5-57 Creating a static ND entryParameter
Description
Destination IPv6 address
Specifies the destination IPv6 address in the static ND entry.
VLAN ID
Specifies the ID of the outer VLAN to which an interface belongs.
Destination MAC address
Specifies the destination MAC address in the static ND entry.
Outbound interface
Clickto select the outbound interface of ND packets.
NOTE:The interface must be a member of the specified VLAN.
- Click Create, as shown in Figure 5-99.
- Modify a static ND entry.
- Click a destination IPv6 address in the static ND entry list to access the corresponding static ND entry modification page, as shown in Figure 5-100.
Table 5-57 describes parameters on the page.
The destination IPv6 address and VLAN ID cannot be modified.
- Click a destination IPv6 address in the static ND entry list to access the corresponding static ND entry modification page, as shown in Figure 5-100.
- Delete a static ND entry.
- Choose to access the Static ND page.
- Select a record that you want to delete and click Delete. The system asks you whether to delete the record.
- Click OK.
- Clear all static ND entries.
- Choose to access the Static ND page.
- Click Clear ALL Static ND Entries. The system asks you whether to delete all static ND entries.
- Click OK.
- Update a static ND entry.
- Choose to access the Static ND page.
- Click Refresh.
- Clear all dynamic ND entries.
- Choose to access the Dynamic ND page.
- Click Clear ALL Dynamic ND Entries. The system asks you whether to delete all dynamic ND entries.
- Click OK.
- Update a dynamic ND entry.
- Choose to access the Dynamic ND page.
- Click Refresh.
DNS
Context
TCP/IP provides domain name system (DNS) to identify hosts using character strings in addition to their IP addresses. DNS uses a hierarchical naming scheme to specify a meaningful name for a network device. Mappings between domain names and IP addresses are established on a DNS server. DNS allows users to use meaningful and easy-to-remember domain names instead of IP addresses to identify devices.
Procedure
- Static DNS
- Create a static DNS entry.
- Choose to access the Static DNS page, as shown in Figure 5-101.
- Click Create, as shown in Figure 5-102.
Table 5-58 describes parameters on the page.
- Set the parameters.
- Click OK.
- Create a static DNS entry.
- Dynamic DNS
- Configure the dynamic domain name resolution function.
- Choose to access the Dynamic DNS page, as shown in Figure 5-103.
- Set Dynamic domain name resolution.
- Create a dynamic DNS list.
- Choose to access the Dynamic DNS page, as shown in Figure 5-103.
- Click Create in the Dynamic DNS List area. The Create a Dynamic DNS Entry page is displayed, as shown in Figure 5-104.
Table 5-59 describes parameters on the page.
Table 5-59 Creating a dynamic DNS listParameter
Description
IP address format
Selects the IP address format:
- IPv4
- IPv6
IP address
Specifies the IP address of a DNS server.
Interface name
This parameter is valid only when IP address format is set to IPv6.
Click
to select the outbound interface for communication with the DNS server.
NOTE:Move the mouse to
on the right to view the detailed rule.
- Set the parameters.
- Click OK.
- Create a domain name suffix list.
- Choose to access the Dynamic DNS page, as shown in Figure 5-103.
- Click Create in the Domain Name Suffix List area. The Create Domain Name Suffix page is displayed, as shown in Figure 5-105.
- Set the domain name suffix.
- Click OK.
- Configure the dynamic domain name resolution function.
- Dynamic DNS Entry
- Choose to access the Dynamic DNS page, as shown in Figure 5-106.
- Click Clear All, Clear IPv4 Dynamic DNS Entries, or Clear IPv6 Dynamic DNS Entries. The system asks you whether to clear the record.
- Click OK.
to select the outbound interface for communication with the DNS server.
on the right to view the detailed rule.
Loopback Interface
Context
According to the TCP/IP protocol suite, the IP addresses on the network segment 127.0.0.0 are loopback addresses. The interfaces that are configured with these addresses are loopback interfaces. During startup, the system automatically creates an interface that uses the loopback address 127.0.0.1 to receive all the packets sent to the local switch.
Procedure
- Create a loopback interface.
- Click Create, as shown in Figure 5-107.
Table 5-60 describes parameters on the page.
Table 5-60 Creating a loopback interfaceParameter
Description
Loopback interface name
Enters the number of the loopback interface. This parameter is mandatory.
IPv4 address/Mask
Enters the IPv4 address and subnet mask of the loopback interface.
IPv6 address/Prefix length
Enters the IPv6 address (for example, FC00:0:130F:0:0:9C0:876A:130B) and prefix length (ranging from 1 to 128).
You can click
to add an IPv6 address or click
to delete an IPv6 address.
- Click Create, as shown in Figure 5-107.
- Modify a loopback interface.
- Click a loopback interface name in the loopback interface list to access the corresponding loopback interface modification page, as shown in Figure 5-108.
Table 5-60 describes parameters on the page.
The loopback interface name cannot be modified.
- Click a loopback interface name in the loopback interface list to access the corresponding loopback interface modification page, as shown in Figure 5-108.
- Delete a loopback interface.
- Choose to access the Loopback Interface page.
- Select a record that you want to delete and click Delete. The system asks you whether to delete the record.
- Click OK.
- Update a loopback interface.
- Choose to access the Loopback Interface page.
- Click Refresh.
to add an IPv6 address or click 
to delete an IPv6 address.