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Configuring RBM+VRRP+NAT server causes nat server address conflict problem

2021-12-27 16:16:43 Published
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Network Topology

The network topology is as follows.


Problem Description

RBM configuration is omitted, please refer to the official website HA typical configuration for details.

https://www.h3c.com/en/d_202102/1383627_294551_0.htm

Configure the G1/0/1 port on RBM1 with the G1/0/1 port on RBM2 as follows.

RBM1:

interface GigabitEthernet1/0/1

 port link-mode route

 combo enable copper

 ip address 2.1.1.1 255.255.255.0

 vrrp vrid 1

 virtual-ip 2.1.1.3 active

 nat server global 2.1.1.4 inside 10.1.1.15 rule ServerRule_1 


RBM2:

interface GigabitEthernet1/0/1

 port link-mode route

 combo enable copper

 ip address 2.1.1.2 255.255.255.0

 vrrp vrid 1

 virtual-ip 2.1.1.3 standby

 nat server global 2.1.1.4 inside 10.1.1.15 rule ServerRule_1 


As a result, we see that the device keeps reporting address conflicts.

%Sep 29 07:31:37:044 2021 H3C ARP/6/DUPIFIP: -COntext=1; Duplicate address 2.1.1.4 on interface GigabitEthernet1/0/1, sourced from 7ab2-2c0e-0206. 

Process Analysis

By default, if the destination IP address of the ARP packet request received by the NAT device is in the same network segment as the IP address of the NAT interface, the NAT device uses the physical MAC address of the NAT interface to respond to the ARP request packet.

The reason is that the global address of NAT SERVER configured on RBM1 and RBM2 both respond to ARP with the physical MAC address of the interface, which is equivalent to having two MAC addresses for the same IP, so IP address conflicts are reported.

Solution

Solution 1. 

Configure NAT SERVER binding VRRP backup group in G1/0/1 of RBM1 and G1/0/1 of RBM2, at this time, the global address of NAT SERVER will respond to ARP with virtual MAC of VRRP, and no more address conflict will be reported.


RBM1:

interface GigabitEthernet1/0/1

 port link-mode route

 combo enable copper

 ip address 2.1.1.1 255.255.255.0 vrrp vrid 1

 virtual-ip 2.1.1.3 active 

 nat server global 2.1.1.4 inside 10.1.1.15 vrrp 1 rule ServerRule_1
 

RBM2:

interface GigabitEthernet1/0/1

 port link-mode route

 combo enable copper

 ip address 2.1.1.2 255.255.255.0

 vrrp vrid 1 virtual-ip 2.1.1.3 active

 nat server global 2.1.1.4 inside 10.1.1.15 vrrp 1 rule ServerRule_1 


Option 2. 

The address of the nat server uses an address that is not in the same network segment as the interface, and then the uplink and downlink devices are configured to route to the NAT SERVER global address.

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