IP Services

If you, for some reason, cannot use easy-ip NAT, you can use source NAT with NAT address pool. Depending on how many public IP addresses you have got, you can configure no-PAT option, when only IP address is translated or you can set PAT, in other words NAT with port translation to assure LAN users accessing Internet. Details in the video 😉

USG firewall configuration script:

#
dhcp enable
#
interface GigabitEthernet1/0/0
undo shutdown
ip address 10.0.0.1 255.255.255.0
service-manage ping permit
dhcp select interface
dhcp server excluded-ip-address 10.0.0.100
dhcp server static-bind ip-address 10.0.0.200 mac-address 5489-98b4-6a79
dhcp server dns-list 10.0.0.100
#
interface GigabitEthernet1/0/2
undo shutdown
ip address 5.0.0.2 255.255.255.252
#
firewall zone trust
set priority 85
add interface GigabitEthernet1/0/0
#
firewall zone untrust
set priority 5
add interface GigabitEthernet1/0/2
#
ip route-static 0.0.0.0 0.0.0.0 5.0.0.1
#
nat address-group SOURCE-NAT 0
mode pat
route enable
section 0 6.6.6.0 6.6.6.0
OR
nat address-group SOURCE-NAT 0
mode no-pat global
route enable
section 0 6.6.6.0 6.6.6.1
#
security-policy
rule name ALLOW
source-zone local
destination-zone trust
destination-zone untrust
action permit
rule name NAT_EASY
source-zone trust
destination-zone untrust
source-address 10.0.0.0 mask 255.255.255.0
action permit
#
nat-policy
rule name SOURCE-NAT
source-zone trust
destination-zone untrust
source-address 10.0.0.0 mask 255.255.255.0
action source-nat address-group SOURCE-NAT

A short video describing EASY-IP source NAT on Huawei’s USG firewall to assure that our intranet users can acccess the Internet.

The easy-ip is the easiest way to translate private IP addresses on your local area network when you have only one public IP address or the public IP address is assigned dynamically.

USG firewall configuration script:

#
dhcp enable
#
interface GigabitEthernet1/0/0
undo shutdown
ip address 10.0.0.1 255.255.255.0
service-manage ping permit
dhcp select interface
dhcp server excluded-ip-address 10.0.0.100
dhcp server static-bind ip-address 10.0.0.200 mac-address 5489-98b4-6a79
dhcp server dns-list 10.0.0.100
#
interface GigabitEthernet1/0/2
undo shutdown
ip address 5.0.0.2 255.255.255.252
#
firewall zone trust
set priority 85
add interface GigabitEthernet1/0/0
#
firewall zone untrust
set priority 5
add interface GigabitEthernet1/0/2
#
ip route-static 0.0.0.0 0.0.0.0 5.0.0.1
#
security-policy
rule name ALLOW
source-zone local
destination-zone trust
destination-zone untrust
action permit
rule name NAT_EASY
source-zone trust
destination-zone untrust
source-address 10.0.0.0 mask 255.255.255.0
action permit
#
nat-policy
rule name NAT_EASY
source-zone trust
destination-zone untrust
source-address 10.0.0.0 mask 255.255.255.0
action source-nat easy-ip
#

You know how to configure DHCP on Huawei router but have problem to do so on Huawei firewall? Take a few minutes and see how to do that.

DHCP IPv4 server that uses interface’s address pool to allocate IPv4 addresses to DHCP clients. The simplest way to implement DHCP on USG6000.

USG firewall configuration script:

#
dhcp enable
#
interface GigabitEthernet1/0/0
undo shutdown
ip address 10.0.0.1 255.255.255.0
service-manage ping permit
dhcp select interface
dhcp server excluded-ip-address 10.0.0.100
dhcp server static-bind ip-address 10.0.0.200 mac-address 5489-98b4-6a79
dhcp server dns-list 10.0.0.100
#
firewall zone trust
set priority 85
add interface GigabitEthernet1/0/0
#
security-policy
rule name ALLOW
action permit
#

So far you have learned basic and selective QinQ on Huawei swiches. They seem like a simple Layer 2 VPN solution, which we can use to connect 2 or more offices. And of course, it is truth.

But, sometimes, we want to have an access to external services or just to the Internet, instead of connecting 2 branch offices. And, still we can use QinQ technology, why not?

The only thing we should do is to terminate QinQ VLAN Tag on a router. Just create L3 subinterface and let the router to use IP routing table to forward packets.

In our LAB, I am going to show you how to terminate QinQ to use DHCP server, located outside our network. In this case DHCP Relay feature must be used.

So let’s get to the point!

QinQ termination on subinterfaces to support DHCP Relay on Huawei

Topology of QinQ to support DHCP Relay

Let’s keep going and finish IPv6 introduction.

Multicast

A multicast address identifies a group of interfaces. Traffic, that is sent to a multicast address, is sent to multiple destinations at the same time. An interface may belong to any number of multicast groups. Multicast addresses are defined by the prefix FF00::/8.

 

The second octet defines the flags and the scope of the multicast address. Flags can be defined as:

• 0 is reserved and must equal 0
• R indicates rendezvous point and is almost always set to 0
• P indicates prefix dependency and is almost always set to 0
• T is the temporary bit. For a temporary multicast address T equals 1; for a permanent multicast address T equals 0.