Chapter 6 (1).pdf

Firewall Hot Standby Technologies  Foreword ⚫ With the rapid development of services such as mobile office, online shopping, instant messaging, Internet finance, and Internet education, networks carry more and more important services. Therefore, how to ensure uninterrupte...

Firewall Hot Standby Technologies  Foreword ⚫ With the rapid development of services such as mobile office, online shopping, instant messaging, Internet finance, and Internet education, networks carry more and more important services. Therefore, how to ensure uninterrupted service transmission on networks becomes an urgent problem to be resolved during network development. ⚫ Hot standby technologies enable firewalls to be deployed at the network egress to ensure communication reliability between internal and external networks. 2 Huawei Confidential  Objectives ⚫ On completion of this course, you will be able to:  Understand the hot standby fundamentals.  Master the basic hot standby configurations. 3 Huawei Confidential  Contents 1. Hot Standby Fundamentals ◼ VRRP ▫ VGMP Group ▫ HRP ▫ Firewall Hot Standby 2. Hot Standby Basic Networking and Configuration 4 Huawei Confidential Background of Hot Standby Technologies ⚫ As shown in the figure on the left, all packets exchanged between intranet and Internet users pass through firewall A. If firewall A is faulty, all hosts that use firewall A as the default gateway on the intranet cannot communicate with the Internet. As a result, communication reliability cannot be ensured. ⚫ As a security device, a firewall is typically deployed between a network to be protected and an unprotected network, that is, on the network border. If only one firewall is deployed on the network border, the system may face the risk of network interruptions caused by a single point of failure no matter how highly reliable the firewall is. To prevent this problem, two firewalls can be deployed to implement hot standby. Intranet Intranet ! Firewall A PC PC ! Firewall A Server Server Firewall B 5 Huawei Confidential VRRP-based Router Redundancy Deployment ⚫ Virtual Router Redundancy Protocol (VRRP) is a fault tolerance protocol that enables a backup router to automatically replace a faulty master router — the next hop (default gateway) of a host. In this way, the backup router can forward packets if a fault occurs, thereby ensuring the continuity and reliability of network communication. Routers in a VRRP group play two roles: master and backup. ⚫ When Router A is working properly:  Router A functions as the master device in the VRRP group and is responsible for forwarding data traffic. Router A Router B Master Backup ⚫ When Router A is faulty: VRRP group  Router B detects VRRP heartbeat timeout and is elected as the new master device. Switch  Router B sends a gratuitous ARP packet. After receiving the packet, the switch updates its MAC address table. Intranet host  Router B responds to users' ARP requests and forwards traffic. 6 Huawei Confidential VRRP Application in Multi-Zone Firewall Networking ⚫ When hot standby is required for firewalls in multiple zones, you need to configure multiple VRRP groups on each firewall. Untrust VRRP group 3 Virtual IP Address 202.38.10.1 Firewall A Firewall B Master Backup VRRP group 1 VRRP group 2 Virtual IP Address Virtual IP Address 10.100.10.1 10.100.20.1 Trust DMZ 10.100.10.0/24 10.100.20.0/24 8 Huawei Confidential Defects of VRRP in Firewall Applications ⚫ Traditional VRRP cannot ensure the state information consistency and VRRP status consistency between the master and backup firewalls in multiple VRRP groups. PC2 Untrust 4 ⚫ When the VRRP status of Firewall A is the same as that of Firewall B: 3 5  When PC1 in the Trust zone accesses PC2 in the Untrust zone, the forward VRRP group 3 and return paths of the packets are the same, Firewall A passes the stateful inspection, and the communication is normal. Session entry Firewall A Firewall B Master Backup ⚫ When the VRRP status of Firewall A is different from that of Firewall B:  The upstream link of Firewall A is faulty, and Firewall B becomes the new 2 VRRP group 1 VRRP group 2 master device of VRRP group 3. 1  When PC1 in the Trust zone accesses PC2 in the Untrust zone, the forward and return paths of the packets are inconsistent, Firewall B fails the stateful inspection, and packet loss occurs. PC1 Server Trust DMZ 9 Huawei Confidential  Contents 1. Hot Standby Fundamentals ▫ VRRP ◼ VGMP Group ▫ HRP ▫ Firewall Hot Standby 2. Hot Standby Basic Networking and Configuration 11 Huawei Confidential VGMP Basic Principles (1) ⚫ To ensure the consistent VRRP group status, the VRRP Group Management Protocol (VGMP) is introduced based on VRRP. Multiple Untrust VRRP groups on a firewall are added to the same VGMP group. The VGMP group manages the status of all VRRP groups in a unified VGMP active VGMP standby manner to ensure the consistent VRRP group status. VRRP group 2  The VGMP group state of firewalls can be load-balance, active, or standby. Firewall A Hello Firewall B  A VGMP group notifies its running status by sending VGMP packets, and elects VRRP VRRP the VGMP active and standby devices based on Hello priority. The VGMP group master Hello backup state of the VGMP active device is active, and that of the VGMP standby device VRRP group 1 is standby.  When the VGMP group state of a firewall is active/standby, all VRRP groups in the VGMP group are in active/standby state. Trust ⚫ The figure shows the process of electing the VGMP active and standby devices. Elect the Switch the Configure VGMP active Enable VGMP. VRRP group VRRP. and standby status. devices. 12 Huawei Confidential VGMP Basic Principles (2) ⚫ When a fault occurs, VGMP switches the status of VRRP groups 1 and 2. When a VGMP group is in active state, the state of all VRRP groups in the VGMP group is master. When a VGMP group is in standby state, the state of all VRRP groups in the VGMP group is backup. Untrust Untrust VGMP active VGMP standby VGMP standby VGMP active VRRP group VRRP group 2 2 Firewall A Firewall B Firewall A Firewall B VRRP VRRP VRRP VRRP master VRRP group backup backup VRRP group master 1 1 Trust Trust 14 Huawei Confidential VGMP Group Management ⚫ Status consistency management  A VGMP group controls the status switchover of all VRRP groups in a unified manner. After a VRRP group is added to a VGMP group, the status of the VRRP group cannot be switched independently. ⚫ Preemption management  When the original active device recovers, the priority of its VGMP group is also restored. In this case, the original active device preempts to be the active device.  After a VRRP group is added to a VGMP group, the preemption function of the VRRP group becomes ineffective, and the VGMP group determines whether to perform preemption. ⚫ Channel management  Channel management determines available interfaces between two firewalls in hot standby mode. The VGMP and HRP modules automatically select available interfaces to send VGMP and HRP packets. 16 Huawei Confidential  Contents 1. Hot Standby Fundamentals ▫ VRRP ▫ VGMP Group ◼ HRP ▫ Firewall Hot Standby 2. Hot Standby Basic Networking and Configuration 17 Huawei Confidential Basic HRP Concepts ⚫ The Huawei Redundancy Protocol (HRP) dynamically backs up status data and key configuration commands between the active and standby firewalls. ⚫ Backup direction Untrust  Configuration commands that can be backed up can be executed only on the active device. These commands are automatically backed up to the standby device, for VGMP active VGMP standby example, security and NAT policy configuration commands. VRRP group 2  In active/standby networking, only the active device processes services, generates Heartbeat link service entries, and backs up the service entries to the standby device. In load balancing Firewall A Firewall B VRRP VRRP networking, both devices process services, generate service entries, and back up the master VRRP group backup service entries to the peer device. 1 ⚫ Backup channel  The network administrator needs to specify a backup channel interface to back up Trust configuration and status data. Generally, the directly connected ports on two firewalls set up the backup channel, which is also called the heartbeat link (VGMP uses this channel for communication). 18 Huawei Confidential Configuration and Status Backup ⚫ To ensure smooth service switchover between two devices, the two devices need to back up their configurations and status information. Backup Mode Backup Content ⚫ Automatic backup: This function can automatically back up ⚫ Device configuration configuration commands in real time and periodically back up status information. This function is enabled by default and applies to various  Policies: include security policy, NAT policy, authentication policy, networks that require hot standby. attack defense, and ASPF. ⚫ Manual batch backup needs to be manually triggered by the  Objects: include address, region, service, application, user, administrator. Each time the manual batch backup command is authentication server, time range, address pool, URL category, executed, the active device immediately synchronizes the keyword group, mail address group, signature, and security profile. configuration commands and status information to the standby device.  Networks: include logical interface, security zone, DNS, static route ⚫ Automatic configuration synchronization between the active and (static routes can be backed up only after the hrp auto-sync config standby firewalls after device restart: The device that is successfully static-route command is configured), IPsec, and SSL VPN. restarted automatically synchronizes the configuration from the firewall that is carrying services.  System: includes the administrator, virtual system, and log configuration. ⚫ Quick session backup: This function applies to the load balancing scenario where the forward and return paths of packets are ⚫ Status information: includes session table, server-map table, blacklist, inconsistent. whitelist, address mapping table, MAC address table, user table, IPsec SA, and tunnel. 19 Huawei Confidential HRP Heartbeat Link ⚫ In hot standby networking, two firewalls learn each other's status and back up configuration commands as well as various entries by exchanging messages through a heartbeat link.  The interfaces at both ends of a heartbeat link are called heartbeat interfaces.  A heartbeat interface can be a physical interface (GE interface) or a logical interface (Eth-Trunk) that is formed by bundling multiple physical interfaces. A physical interface functions as a heartbeat interface. GE1/0/1 GE1/0/1 Firewall Firewall An Eth-Trunk interface functions as a heartbeat interface GE1/0/1 GE1/0/1 GE1/0/2 GE1/0/2 GE1/0/3 GE1/0/3 Heartbeat interface Firewall Firewall Eth-Trunk1 HRP data packets Eth-Trunk1 20 Huawei Confidential Heartbeat Interface Status ⚫ An HRP heartbeat interface has five states: Invalid, Down, Peerdown, Ready, and Running. A physical interface functions as a heartbeat interface. GE1/0/1 Invalid Peerdown GE1/0/1 Firewall Firewall 1.1.1.1 1.1.1.2 GE1/0/2 Peerdown Down GE1/0/2 2.2.2.1 2.2.2.2 Running Running GE1/0/3 GE1/0/3 3.3.3.1 3.3.3.2 GE1/0/4 Ready Ready GE1/0/4 4.4.4.1 4.4.4.2 Heartbeat interface Heartbeat link HRP heartbeat link detection packets HRP data packets 21 Huawei Confidential  Contents 1. Hot Standby Fundamentals ▫ VRRP ▫ VGMP Group ▫ HRP ◼ Firewall Hot Standby 2. Hot Standby Basic Networking and Configuration 23 Huawei Confidential Application Scenario of Firewall Hot Standby in Active/Standby Mode ⚫ Application scenario  Firewall hot standby applies to scenarios that require high reliability, such as enterprise office scenarios. To improve network reliability, two firewalls can be deployed at the egress of an enterprise network to implement hot standby. To meet service requirements, the firewalls work in active/standby mode. Switch C Switch D ⚫ Configuration analysis VRRP group 2  VGMP group status of firewalls: Firewall A is the master firewall, and its VGMP group status is active. Firewall B is the backup firewall, and its VGMP group status is standby. Firewall A GE0/0/1 GE0/0/1 Firewall B Master Heartbeat link Backup  VRRP group: VRRP group 1 is configured in the downstream direction of the firewalls, and VRRP group 2 is configured in the upstream direction of the firewalls. In VRRP groups 1 VRRP group 1 and 2, Firewall A is configured as the master device, and Firewall B as the backup device.  Backup mode: By default, the automatic backup mode is used. Switch A Switch B  Backup interface: Interfaces GE0/0/1 of the firewalls are the heartbeat interfaces and are connected through the heartbeat link.  Preemption: This function is enabled by default. The default preemption delay is 60s. Host A Host B Intranet 24 Huawei Confidential Working Process of Firewall Hot Standby in Active/Standby Mode ⚫ Firewall status: Firewall A is the master device, its VGMP group status is active, and its status in VRRP groups 1 and 2 is master. Firewall B is the backup device, its VGMP group status is standby, and its status in VRRP groups 1 and 2 is backup. ⚫ Configuration and status backup: The configuration and status of Firewall A are Switch C Switch D backed up to Firewall B through the heartbeat link in real time. VRRP group 2 ⚫ Traffic forwarding path: Firewall A sends gratuitous ARP packets to Switch A and Switch C to update the MAC address tables of the switches. When Host A accesses Firewall A Firewall B the Internet, it queries the gateway MAC address (MAC address of the VRRP virtual Master Backup IP address) through ARP. Firewall A replies with the VRRP virtual MAC address. Host VRRP group 1 A then sends service packets to Switch A. Switch A forwards the traffic to Firewall A based on the MAC address table, and then Firewall A forwards the traffic to the Switch A Switch B Internet. The traffic forwarding process is similar in the return direction. Traffic from Host A to the Internet Host A Host B Traffic from Host B Intranet to the Internet 25 Huawei Confidential Active/Standby Switchover of Firewall Hot Standby (1) ⚫ Service port/line fault  As shown in the figure, when the service interface or service line of Firewall A is faulty, the priority of the VGMP group on Firewall A decreases and Firewall A sends a VGMP request packet. Switch C Switch D  After receiving the VGMP request packet, Firewall B compares the VRRP group 2 VGMP group priority in the packet with its own VGMP group priority Firewall A Firewall B and sends a VGMP response packet. Backup Master  After receiving the response packet, Firewall A switches its VGMP VRRP group 1 group status to standby, and the status of VRRP groups 1 and 2 to backup. Switch A Switch B  Firewall B switches its VGMP group status to active, and the status of VRRP groups 1 and 2 to master. Firewall B sends gratuitous ARP packets to Switch B and Switch D. Host A Host B Intranet 26 Huawei Confidential Active/Standby Switchover of Firewall Hot Standby (2) ⚫ Device fault  Firewall A is faulty and does not send HRP Hello packets. Firewall B does not receive HRP Hello packets from Switch C Switch D Firewall A within five packet transmission intervals and becomes the master device. Firewall B then changes its VRRP group 2 VGMP group status to active and the status of VRRP Firewall A Firewall B ! Master groups 1 and 2 to master. VRRP group 1 Switch A Switch B Host A Host B Intranet 27 Huawei Confidential Active/Standby Switchover of Firewall Hot Standby (3) ⚫ Heartbeat link fault  If the heartbeat link is faulty and Firewall B does not receive HRP Hello packets from Firewall A within five Switch C Switch D packet transmission intervals, Firewall B becomes the master device and changes its VGMP group status to active VRRP group 2 and the status of VRRP groups 1 and 2 to master. In this Firewall A Firewall B Master Heartbeat link Master case, the dual-active situation occurs. VRRP group 1 Switch A Switch B Host A Host B Intranet 28 Huawei Confidential Active/Standby Switchback of Firewall Hot Standby ⚫ After Firewall A recovers, the priority of its VGMP group is restored. After 60s, Firewall A sends a VGMP request packet. ⚫ After receiving the VGMP request packet, Firewall B compares Switch C Switch D the VGMP group priority in the packet with its own VGMP group priority. If Firewall B finds that its VGMP group priority is VRRP group 2 the same as or lower than that of Firewall A, Firewall B returns Firewall A Firewall B Master Backup a VGMP response packet and switches its VGMP group status to standby and the status of VRRP groups 1 and 2 to backup. VRRP group 1 ⚫ After receiving the response packet, Firewall A switches its Switch A Switch B VGMP group status to active and the status of VRRP groups 1 and 2 to master. Host A Host B Intranet 29 Huawei Confidential  Contents 1. Hot Standby Fundamentals 2. Hot Standby Basic Networking and Configuration 30 Huawei Confidential Example for Configuring Firewall Hot Standby in Active/Standby Mode (1) ⚫ Requirements:  The service interfaces of Firewalls A and B work at Layer 3 and are connected to Layer 2 switches in both upstream and downstream directions. The upstream switch connects to the interface provided by the carrier who has assigned the IP address 1.1.1.1 to the enterprise. Firewalls A and B are required to work in active/standby mode. In normal cases, traffic is forwarded VRRP group 1 by Firewall A. If Firewall A fails, traffic is forwarded by Firewall B to ensure 10GE 0/0/1 10GE 0/0/1 service continuity. 10GE0/0/7 10GE0/0/7 Firewall A Firewall B  Virtual IP address of VRRP group 1: 1.1.1.1/24 Master Backup 10GE0/0/3 10GE0/0/3  Virtual IP address of VRRP group 2: 10.3.0.3/24 VRRP group 2  IP address of the heartbeat interface 10GE0/0/7 on Firewall A: 10.10.0.1/24  IP address of the heartbeat interface 10GE0/0/7 on Firewall B: 10.10.0.2/24 Intranet 31 Huawei Confidential Example for Configuring Firewall Hot Standby in Active/Standby Mode (2) ⚫ Configuration roadmap: Start  Complete basic network configurations, including configuring IP addresses for interfaces of two firewalls, adding interfaces to security zones, and configuring Complete basic network configurations. default routes. Configure a VRRP group.  Configure a VRRP group on the two firewalls.  Configure a security policy to allow heartbeat interfaces to exchange HRP Configure a security policy. packets.  Specify heartbeat interfaces, configure the authentication key, and enable hot Specify a heartbeat interface and enable hot standby. standby.  Configure a security policy to allow intranet users to access the Internet. Configure a security policy and a NAT policy.  Configure a NAT policy to allow intranet users to access the Internet. End 32 Huawei Confidential Example for Configuring Firewall Hot Standby in Active/Standby Mode (3) ⚫ Configure VRRP group 1 on the upstream service interface 10GE0/0/1 of Firewall A and set the status to active. [FWA] interface 10ge0/0/1 [FWA-10GE0/0/1] vrrp vrid 1 virtual-ip 1.1.1.1 active [FWA-10GE0/0/1] quit [FWA] interface 10ge0/0/3 [FWA-10GE0/0/3] vrrp vrid 2 virtual-ip 10.3.0.3 active [FWA-10GE0/0/3] quit ⚫ Configure VRRP group 1 on the upstream service interface 10GE0/0/1 of Firewall B and set the status to standby. [FWB] interface 10ge0/0/1 [FWB-10GE0/0/1] vrrp vrid 1 virtual-ip 1.1.1.1 standby [FWB-10GE0/0/1] quit [FWB] interface 10ge0/0/3 [FWB-10GE0/0/3] vrrp vrid 2 virtual-ip 10.3.0.3 standby [FWB-10GE0/0/3] quit 33 Huawei Confidential Example for Configuring Firewall Hot Standby in Active/Standby Mode (4) ⚫ Specify a heartbeat interface on Firewall A, configure the authentication key, and enable hot standby. [FWA] hrp interface 10ge0/0/7 remote 10.10.0.2 [FWA] hrp authentication-key Admin@123 [FWA] hrp enable ⚫ Specify a heartbeat interface on Firewall B, configure the authentication key, and enable hot standby. [FWB] hrp interface 10ge0/0/7 remote 10.10.0.1 [FWB] hrp authentication-key Admin@123 [FWB] hrp enable 34 Huawei Confidential  Quiz 1. (True/False) The HRP technology implements configuration synchronization between the active and standby firewalls and ensures that the configuration is not lost after a firewall restart. Then no information needs to be configured on the standby firewall. ( ) A. True B. False 2. (True/False) Firewall quick session backup applies to the load balancing scenario. ( ) A. True B. False 35 Huawei Confidential  Summary ⚫ This course describes the application scenarios, technical principles, packet forwarding process, and active/standby switchover logic of hot standby, as well as the key configurations and configuration processes of hot standby in different networking modes. ⚫ Upon completion of this course, you will be able to understand the application scenarios of hot standby, independently configure hot standby for Huawei firewalls based on the lab in the actual environment, and master how to deploy firewalls in hot standby scenarios. 36 Huawei Confidential  Recommendations ⚫ Huawei official websites  Enterprise service: https://e.huawei.com/en/  Technical support: https://support.huawei.com/enterprise/en/index.html  Online learning: https://learning.huawei.com/en/ 37 Huawei Confidential Acronyms and Abbreviations Acronym and Abbreviation Full Name GE Gigabit Ethernet HRP Huawei Redundancy Protocol USG Universal Service Gateway VGMP VRRP Group Management Protocol VRRP Virtual Router Redundancy Protocol 38 Huawei Confidential Thank you. 把数字世界带入每个人、每个家庭、 每个组织，构建万物互联的智能世界。 Bring digital to every person, home, and organization for a fully connected, intelligent world. Copyright©2022 Huawei Technologies Co., Ltd. All Rights Reserved. The information in this document may contain predictive statements including, without limitation, statements regarding the future financial and operating results, future product portfolio, new technology, etc. There are a number of factors that could cause actual results and developments to differ materially from those expressed or implied in the predictive statements. Therefore, such information is provided for reference purpose only and constitutes neither an offer nor an acceptance. Huawei may change the information at any time without notice.