Example for Using Advanced ACLs to Restrict Mutual Access Between Network Segments

Networking Requirements

As shown in Figure 1, the departments of an enterprise are connected through the Switch. To facilitate network management, the administrator allocates the IP addresses on two network segments to the R&D and marketing departments, respectively. In addition, the administrator adds the two departments to different VLANs for broadcast domain isolation. The Switch needs to restrict mutual access between two network segments to ensure information security.

Figure 1 Using advanced ACLs to restrict mutual access between network segments

Configuration Roadmap

The following configurations are performed on the Switch. The configuration roadmap is as follows:

Configure an advanced ACL and an ACL-based traffic classifier to filter the packets exchanged between R&D and marketing departments.
Configure a traffic behavior to discard the packets matching the ACL.
Configure and apply a traffic policy to make the ACL and traffic behavior take effect.

Procedure

Configure VLANs and IP addresses for interfaces to ensure network connections.

# Create VLAN 10 and VLAN 20.

<HUAWEI> system-view
[HUAWEI] sysname Switch
[Switch] vlan batch 10 20

# Configure GE0/0/1 and GE0/0/2 on the Switch as trunk interfaces, and add the two interfaces to VLAN 10 and VLAN 20, respectively.

[Switch] interface gigabitethernet 0/0/1
[Switch-GigabitEthernet0/0/1] port link-type trunk
[Switch-GigabitEthernet0/0/1] port trunk allow-pass vlan 10
[Switch-GigabitEthernet0/0/1] quit
[Switch] interface gigabitethernet 0/0/2
[Switch-GigabitEthernet0/0/2] port link-type trunk
[Switch-GigabitEthernet0/0/2] port trunk allow-pass vlan 20
[Switch-GigabitEthernet0/0/2] quit

# Create VLANIF 10 and VLANIF 20, and assign IP addresses to them.

[Switch] interface vlanif 10
[Switch-Vlanif10] ip address 10.1.1.1 24
[Switch-Vlanif10] quit
[Switch] interface vlanif 20
[Switch-Vlanif20] ip address 10.1.2.1 24
[Switch-Vlanif20] quit

Configure ACLs.
# Create the advanced ACL 3001, and configure rules for the ACL to block the packets from the R&D department to the marketing department.
```
[Switch] acl 3001
[Switch-acl-adv-3001] rule deny ip source 10.1.1.0 0.0.0.255 destination 10.1.2.0 0.0.0.255
[Switch-acl-adv-3001] quit
```
# Create the advanced ACL 3002, and configure rules for the ACL to block the packets from the marketing department to the R&D department.
```
[Switch] acl 3002
[Switch-acl-adv-3002] rule deny ip source 10.1.2.0 0.0.0.255 destination 10.1.1.0 0.0.0.255
[Switch-acl-adv-3002] quit
```

Configure an advanced ACL-based traffic classifier.

# Configure the traffic classifier tc1 to classify packets that match ACL 3001 and ACL 3002.

[Switch] traffic classifier tc1
[Switch-classifier-tc1] if-match acl 3001
[Switch-classifier-tc1] if-match acl 3002
[Switch-classifier-tc1] quit

Configure a traffic behavior.

# Configure the traffic behavior tb1 to reject packets.

[Switch] traffic behavior tb1
[Switch-behavior-tb1] deny
[Switch-behavior-tb1] quit

Configure a traffic policy.
# Define the traffic policy, and associate the traffic classifier and traffic behavior with the traffic policy.
```
[Switch] traffic policy tp1
[Switch-trafficpolicy-tp1] classifier tc1 behavior tb1
[Switch-trafficpolicy-tp1] quit
```

Apply the traffic policy to interfaces.

# Packets from the R&D department are received by GE0/0/1, and packets from the marketing department are received by GE0/0/2. Therefore, apply the traffic policy to the inbound direction of GE0/0/1 and GE0/0/2.

[Switch] interface gigabitethernet 0/0/1
[Switch-GigabitEthernet0/0/1] traffic-policy tp1 inbound
[Switch-GigabitEthernet0/0/1] quit
[Switch] interface gigabitethernet 0/0/2
[Switch-GigabitEthernet0/0/2] traffic-policy tp1 inbound
[Switch-GigabitEthernet0/0/2] quit

Verify the configuration.

# Check the configuration of ACL rules.

[Switch] display acl 3001
Advanced ACL 3001, 1 rule                                                       
Acl's step is 5                                                                 
 rule 5 deny ip source 10.1.1.0 0.0.0.255 destination 10.1.2.0 0.0.0.255

[Switch] display acl 3002
Advanced ACL 3002, 1 rule                                                       
Acl's step is 5                                                                 
 rule 5 deny ip source 10.1.2.0 0.0.0.255 destination 10.1.1.0 0.0.0.255

# Check the configuration of the traffic classifier.

[Switch] display traffic classifier user-defined
  User Defined Classifier Information:                                          
   Classifier: tc1                                                              
    Operator: OR                                                                
    Rule(s) : if-match acl 3001                                                 
              if-match acl 3002                                                  
                                                                                
Total classifier number is 1

# Check the configuration of the traffic policy.

[Switch] display traffic policy user-defined tp1
  User Defined Traffic Policy Information:                                      
  Policy: tp1                                                                   
   Classifier: tc1                                                              
    Operator: OR                                                                
     Behavior: tb1                                                              
      Deny

# The two network segments where the R&D and marketing departments reside cannot access each other.

Configuration Files

Switch configuration file

#
sysname Switch
#
vlan batch 10 20 
#
acl number 3001                                                                 
 rule 5 deny ip source 10.1.1.0 0.0.0.255 destination 10.1.2.0 0.0.0.255        
acl number 3002                                                                 
 rule 5 deny ip source 10.1.2.0 0.0.0.255 destination 10.1.1.0 0.0.0.255
#
traffic classifier tc1 operator or
 if-match acl 3001                                                              
 if-match acl 3002   
#
traffic behavior tb1
 deny
#
traffic policy tp1 match-order config
 classifier tc1 behavior tb1
#
interface Vlanif10
 ip address 10.1.1.1 255.255.255.0
#
interface Vlanif20
 ip address 10.1.2.1 255.255.255.0
#
interface GigabitEthernet0/0/1
 port link-type trunk                                                           
 port trunk allow-pass vlan 10 
 traffic-policy tp1 inbound
#
interface GigabitEthernet0/0/2
 port link-type trunk                                                           
 port trunk allow-pass vlan 20 
 traffic-policy tp1 inbound
#
return

Example for Using Advanced ACLs to Restrict Mutual Access Between Network Segments

Networking Requirements

Configuration Roadmap

Procedure

Configuration Files

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