If the asa is used for terminating vpn then it is advisable to use a failover key avoid using clear text to carry sensitive information like usernames, passwords and preshared keys. Some configuration elements for clientless ssl vpn such as bookmarks and customization use the vpn failover subsystem, which is part of stateful failover. The asa supports two failover configurations, activeactive failover and. Configuring ipsec stateful failover for an easy vpn server example. So best practice is to configure virtual mac addresses in an activestandby setup running in singlecontext mode activestandby failover is the only option when you are running in singlecontext mode with the goal of achieving a stateful failover. The problem described in this bug only applies to the mac native l2tpipsec vpn client connections. Nov 14, 2016 the problem described in this bug only applies to the mac native l2tpipsec vpn client connections. Sonicwall stateful high availability upgrade fsonicwall nsa. Alternatively, you can manually set a virtual mac address for both units to use. Aug 17, 2009 unfortunately, ipsec stateful failover does not yet support virtual tunnel interfaces vtis, so well have to make due with crypto maps. Vpn availability configuration guide, cisco ios release 12. Stateless failover is not recommended for clientless ssl vpn.
Along with stateful high availability, the virtual mac address feature was introduced. However, if a device has more than one external interface and one of them is not available, your firebox can try to negotiate the vpn through a different external interface. We can use ioss stateful ipsec failover feature to dualhome a single. Vpn availability configuration guide, cisco ios release. Cisco asa firewall active standby failover network rare.
When a failover occurs, the ip address and mac doesnt change on this interface unless its configured on a data port ha with transparent firewall mode spanning tree is a consideration here since it will go into blocking mode while it reconverges. The company requires implementation of the stateful failover feature to ensure that all the active. In an activestandby failover, one asa must function as the active unit, handling all traffic inspection at any given time. You can encrypt the communications for enhanced security by configuring an ipsec. Mar 23, 2019 if the asa is used for terminating vpn then it is advisable to use a failover key avoid using clear text to carry sensitive information like usernames, passwords and preshared keys. If you chose to, you can use a failover key instead of ipsec using the following command.
Failover, clustering, and redundancy flashcards quizlet. Failover guidelines l2tp over ipsec sessions are not supported by stateful failover. The failover mechanism is stateful which means that the active asa sends all stateful connection information state to the standby asa. Auto mac generation is disabled by default so you should enable it if you can. Apr, 2011 stateful failover with dynamic routing protocols. Virtual mac allows the primary and backup appliances to share a single mac address. The failover link and the stateful failover link are in a private ip space and are only used for communication between peers in a high availability pair.
A virtual mac address is defined for this group mac address ethernet0 0000. The asas are not currently configured with stateful failover links, so i have to. Step 14 you can configure stateful failover to maintain connection status, translation, and other information on the standby appliance to avoid interruption of services when a failover occurs. We need to have two firewall with same hardware, same no. This includes tcpudp states, nat translation tables, arp table, vpn information and more. The virtual mac address allows the high availability pair to share the same mac address, which dramatically reduces convergence time following a failover. You must use stateful failover to synchronize these elements between the members of the failover pair. Virtual mac for reduced convergence time after failover the virtual mac address setting allows the ha pair to share the same mac address, which dramatically reduces convergence time following a failover. Ha lite is an activepassive deployment that provides configuration synchronization and some runtime data synchronization such as ipsec security. The health of the active interfaces and units is monitored to determine if specific failover conditions are met. Now, we need to configure the ip address for the outside interface.
Sep 22, 2014 all information sent over the failover and stateful failover links is sent in clear text unless you secure the communication with a failover key. It does not support any session synchronization ha2, and therefore does not offer stateful failover. Virtual mac addressing contributes to network continuity and efficiency during a failover in the same way as the use of virtual ip. Cisco firepower threat defense configuration guide for. Nov 18, 2017 in following example we have used 01 as inside, 00 as outside, 02 as failover link, 03 as stateful link. Firewall high availability for anyconnect vpn supinfo. Failover and stateful link for ftd high availability cisco defense.
May 19, 2018 troubleshooting failover on cisco activestandby asa firewall ive encountered failover flapping between an active and standby cisco asa firewalls which caused an ipsec vpn tunnels to go down. Purpose of this post is to configure ha in asa activepassive. Cisco asa activestandby failover configuration network galaxy. In stateful failover, the active unit sends updates to the standby unit whenever these is a change in the state table. When a failover occurs, the ip address and mac doesnt change on this interface unless its configured on a data port ha with transparent firewall mode spanning tree is a consideration here since it will. You cannot assign both types of addresses to the stateful failover link. Virtual mac allows the backup unit in an ha pair to use the mac address of the primary unit when a failover occurs.
The cisco asa does not support vpn when configured in multicontext mode. When the stateful high availability upgrade is licensed, virtual mac capability is also licensed. Unfortunately, ipsec stateful failover does not yet support virtual tunnel interfaces vtis, so well have to make due with crypto maps. In case of a failover, the following sequence of events occurs.
To use the stateful failover, you need to configure a stateful failover link to pass all state information. To achieve redundancy for ikev2, use flexvpn, dmvpn, redundant vti based ipsec vpn tunnels with dynamic routing protocols and backup routes over second tunnel. When stateful failover is enabled, the active unit continually passes perconnection state information to the standby unit. Configuring stateful failover on a cisco asa ha pair write mem. Leaves the asa open to a replay attack if the stateful failover link is shared with a regular data interface creates a. You can assign either an ipv4 or an ipv6 address to the interface.
Youll see console messages that cycles between failover lan failed and then failover lan became ok on both active and standby firewalls. Troubleshooting failover on cisco activestandby asa firewall. Ive encountered failover flapping between an active and standby cisco asa firewalls which caused an ipsec vpn tunnels to go down. Apr 08, 2020 some configuration elements for clientless ssl vpn such as bookmarks and customization use the vpn failover subsystem, which is part of stateful failover. When enabled, it will autogenerate the mac prefix based on the last two bytes of the interface of backplane mac address. This greatly simplifies the process of updating network routing tables when a failover.
My wife does an instagram account for one of the travel firewall and vpn. Mar 28, 2019 cisco asa multiple context mode with activeactive stateful failover multiple context mode is the method that asas use to virtualize or user created firewalls. Jan 27, 2016 configuring high availability requires two identical asas connected to each other through a dedicated failover link and, optionally, a stateful failover link. These new user firewalls can be allocated to a customer, business unit or other need. The administrator configures the failover lan link interface as the stateful failover link. For the sake of simplicity, well limit encrypted traffic to. Sends all information over the failover link in plaintext unless secured by a failover key. There are no special dependencies with failover, like lowest mac address is active, etc. After a failover occurs, the same connection information is available at the new active unit. Sep 25, 2018 the stateful failover link ip address and mac address do not change at failover unless it uses a data interface. The outside interfaces on asas are ge00 and lan interfaces are ge01. Note if the stateful failover link uses the failover link or data interface, skip this step.
Leaves the asa open to a replay attack if the stateful failover link is shared with a regular data interface creates a potential security risk when terminating vpn tunnels because the username, passwords, and psks are all in clear text. However, applications operating over the vpn connection could lose packets during the failover. For the sake of simplicity, well limit encrypted traffic to that between 10. This includes tcpudp states, nat translation tables, arp.
You can configure a dedicated interface or use the previously configured failover interface for this communication. The cisco asa supports activeactive and activestandby failover. State information not replicated in stateful failoverdynamic routing table entries, uauth cutthrough proxy, dhcp leases, phone proxy and ssm activity. Dec 01, 20 activestandby failover on an asa to coexist as a failover or redundant pair, two asas must be identical in terms of hardware and ios and must coordinate their failover roles. Supported enduser applications are not required to reconnect to keep the same communication session. State information replicated in stateful failovernat, arp, mac, tcpudp connections, h. Read about failover and stateful links for ftd ha configurations. When using failover, asa generates both active and standby mac addresses for each interface. Stateful failover for ipsec is not supported on the cisco 800 series routers. Cisco asa activestandby failover configuration example. Firewall high availability for anyconnect vpn supinfo, ecole. Both the above failover types support stateful failover.
A pc user connects to the network, and the primary sonicwall security appliance creates a session for the user. Per the following, failover does not support l2tp connections. The active ip address always stays with the primary unit, while the standby ip address stays with the secondary unit. Stateless failover all active connections are dropped. Optional assigns an active and standby ip address to the stateful failover link. Stateful failover works with the routing protocols and syncs the routing information between the failover devices. Convergence time is the amount of time it takes for the devices in a network to adapt their.
Asa failover problem with remote vpn connections when fail just in case anyone is suffering a similar problem, this turned out to be a cisco software bug. Vpn failover does not occur for bovpn tunnels with dynamic nat enabled as part of their tunnel configuration. Your firebox can terminate a specific vpn on only one interface at a time. The following sample outputs from the show runningconfig command show how to configure stateful failover for a remote access connection via an easy vpn server. This post describes how to configure asa activestandby failover. Vpn failover is not supported for vpn connections to a thirdparty device. Actually it is the same cli, web ui and wsm windows management application for all models. Sonicwall stateful high availability upgrade for sonicwall. The active unit always uses the primary units ip addresses and mac. All information sent over the failover and stateful failover links is sent in clear text unless you secure the communication with a failover key. After a failover occurs, the same connection information is available at. Fortigate ha device failover is supported by the ha heartbeat, virtual mac addresses, configuration synchronization, route synchronization and ipsec vpn sa. Can be configured with active and standby ips and mac addresses. The virtual mac address allows the high availability pair to share the same mac address, which.
Aug 12, 2016 all information sent over the failoverstateful failover links is sent in clear text, to encrypt this information use a failover key recommended vpn preshared keys etc would be transmitted over this link, so secure the communication. Apr 27, 2016 configuring stateful failover on a cisco asa ha pair the asa, ciscos adaptive security appliance, has been around for over 15 years and has since become an ubiquitous network security solution, securing networks the world over. Cisco asa multiple context mode with activeactive stateful failover multiple context mode is the method that asas use to virtualize or user created firewalls. Lets consider an example of activestandby failover configuration see diagram below.
Ra vpn remote access vpn end users do not have to reauthenticate or reconnect the vpn session after a failover. Configuring stateful failover on a cisco asa ha pair. Ha lite is an activepassive deployment that provides configuration synchronization and some runtime data synchronization such as ipsec security associations. Convergence time is the amount of time it takes for the devices in a network to adapt their routing tables to the changes introduced by high availability.
I thought for thesting, is it the same gui in the cheapest watchguard as the more expansive models. The primary appliance synchronizes with the backup appliance. Check enable stateful synchronization check enable virtual mac. We also need to set the standby ip address on that will be used by the secondary unit. Firepower management center configuration guide, version 6. Sonicwall stateful high availability upgrade fsonicwall. The following configuration is applied to r1 and r2. Configuring active standby failover on the cisco asa. Stateful failover and stateless regular failover configuration and explanations. Model 5505 or 5510 or 5520, etc amount of ram number of interfaces should be the same type as well external modules cscssm or ipsssm activation key with the same features failover mode encryption level number of vpn peers same size flash is not required definitions. The following figure shows a sample stateful high availability network. A pc user connects to the network, and the primary sonicwall security. Cisco asa multiple context mode with activeactive stateful. If the asa is used to terminate vpn tunnels, this information includes any usernames, passwords and preshared keys used for establishing the tunnels.
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