Detailed explanation of NAT configuration of Huawei, Cisco, and Juniper.
1. Huawei
Huawei is a world-leading provider of information and communication technology solutions, and its network equipment provides powerful NAT functions.
The following is an example of a NAT configuration on a Huawei device:
sysname Router
#
interface GigabitEthernet 0/0/1
ip address 192.168.1.1 255.255.255.0
nat outbound 2000
#
nat address-group 2000 192.168.2.1 192.168.2.10
#
acl number 2000
rule 5 permit source 192.168.1.0 0.0.0.255
#
interface GigabitEthernet 0/0/0
ip address 203.0.113.1 255.255.255.0
nat outbound 3000
#
nat address-group 3000 203.0.113.2 203.0.113.10
#
acl number 3000
rule 5 permit source 192.168.1.0 0.0.0.255
In the above configuration, we first configured the IP addresses of the two interfaces. We then enable egress NAT for both interfaces using the "nat outbound" command. Next, we define two address groups, one for the inside interface and one for the outside interface. Finally, we created two access control lists (ACLs) to determine which traffic needs to be NAT'd.
2. Cisco
Cisco is one of the world's leading network equipment manufacturers, and its equipment is widely used in various network environments. The following is an example NAT configuration on a Cisco device:
interface GigabitEthernet0/0
ip address 192.168.1.1 255.255.255.0
ip nat inside
!
interface GigabitEthernet0/1
ip address 203.0.113.1 255.255.255.0
ip nat outside
!
ip nat pool POOL1 192.168.2.1 192.168.2.10 prefix-length 24
!
ip nat inside source list 1 pool POOL1 overload
!
access-list 1 permit 192.168.1.0 0.0.0.255
On the Cisco device, we first configured IP addresses for the two interfaces, and specified the inside and outside interfaces using the "ip nat inside" and "ip nat outside" commands. Next, we created an IP address pool, which defines the range of IP addresses within the internal network.
Finally, we use the "ip nat inside source" command to associate ACL 1 with the address pool and enable overload to allow multiple internal addresses to share a single public IP address.
3. Juniper
Juniper Networks is a well-known manufacturer of network equipment, and its equipment provides high-performance and reliable NAT functions. The following is an example NAT configuration on a Juniper device:
set security nat source pool POOL1 address 192.168.2.1 to 192.168.2.10
set security nat source rule-set NAT-SET from zone trust
set security nat source rule-set NAT-SET to zone untrust
set security nat source rule-set NAT-SET rule RULE1 match source-address 192.168.1.0/24
set security nat source rule-set NAT-SET rule RULE1 then source-nat pool POOL1
On the Juniper device, we first created an address pool, specifying the range of IP addresses in the internal network.
Then, we created a source NAT rule-set (rule-set) with the source zone set to the "trust" zone and the destination zone set to the "untrust" zone.
Next, we create a rule and match the source address to 192.168.1.0/24. Finally, we associate this rule to the previously created address pool for source NAT translation.
Summarize
Huawei, Cisco, and Juniper are well-known network equipment manufacturers that provide powerful NAT functions. When configuring NAT, we need to specify internal and external interfaces, define address pools or address groups, and use ACLs or rule sets to determine the traffic that needs to be NATed.
Huawei uses "nat outbound" command and address group to configure NAT, Cisco uses "ip nat" command and address pool to configure NAT, and Juniper uses "set security nat" command and address pool to configure NAT.