If you did use the prompts, but want to use this configuration instead, clear the configuration first with the clear configure all command.
If you do not reformat the disks, then when you try to copy the ASA image, you see the following error:. You also need to download ASDM to flash memory. The ASA supports many server types. Copy the boot image to the ASA. Do not transfer the system software; it is downloaded later to the SSD. Do not download it to disk0 on the ASA.
You might need to press Enter after opening the session to get to the login prompt. If the module boot has not completed, the session command will fail with a message about not being able to connect over ttyS1. Wait and try again. You are prompted for the following. Note that the management address and gateway, and DNS information, are the key settings to configure. This file is large and can take a long time to download, depending on your network. When installation is complete, the system reboots.
The time required for application component installation and for the ASA FirePOWER services to start differs substantially: high-end platforms can take 10 or more minutes, but low-end platforms can take minutes or longer. The show module sfr output should show all processes as Up. If you saved your license activation key from this ASA before you previously reimaged to the Firepower Threat Defense device, you can re-install the activation key. If you did not save the activation key but own licenses for this ASA, you can re-download the license.
This serial number is different from the chassis serial number printed on the outside of your hardware. The chassis serial number is used for technical support, but not for licensing. Your Send To email address and End User name are auto-filled; enter additional email addresses if needed.
Check the I Agree check box, and click Submit. For time-based licenses, each license has a separate activation key. You can ignore this message. You can only install one permanent key, and multiple time-based keys. If you enter a new permanent key, it overwrites the already installed one. No licenses are pre-installed, but depending on your order, the box might include a PAK on a printout that lets you obtain a license activation key for the following licenses:.
Control and Protection. This subscription includes entitlement to Rule, Engine, Vulnerability, and Geolocation updates.
To install the Control and Protection licenses and other optional licenses, see the ASA quick start guide for your model. This procedure restores the device to a factory default condition. If you want to perform a regular upgrade, see the upgrade guide instead.
If you see the following message, then you waited too long, and must reload the FTD again after it finishes booting:. This step erases the old FTD boot and system images. If you do not erase the system image, you must remember to escape out of the boot process after you load the boot image in the next step; if you miss the escape window, the FTD will continue to load the old FTD system image, which can take a long time, and you will have to start the procedure over again.
If you did not erase the disk in the previous step, then you need to press Esc to enter the boot CLI:. Download the Firepower Threat Defense system software install package. Firepower Device Manager for the Firepower Firepower Management Center for the Firepower ASA for the Firepower Skip to content Skip to search Skip to footer. Available Languages.
Download Options. Updated: September 11, Note A Cisco. Before you begin. Caution This step erases your configuration. If you see the below error, you may have entered the package name , instead of the package version : Invalid software pack Please contact technical support for help. To perform the reimage, you must connect your computer to the console port.
You can only upgrade to a new version; you cannot downgrade. Pay close attention to the monitor. Depending on your network, this might take a couple of minutes when using DHCP Pre-configure Firewall now through interactive prompts [yes]?
Host name—Up to 65 alphanumeric characters, no spaces. Hyphens are allowed. Figure 1. The remote user is located somewhere on the outside and wants remote access with the Anyconnect VPN client.
R1 on the left side will only be used so that we can test if the remote user has access to the network. Each operating system has a different installation file and we need to have them on the flash memory of the ASA:. There is a different PKG file for each operating system. Now we can enable client WebVPN on the outside interface:. When you have an inbound access-list on the outside interface then all your decrypted traffic from the SSL WebVPN has to match the inbound access-list.
You can either create some permit statements for the decrypted traffic or you can just tell the ASA to let this traffic bypass the access-list:. By default all traffic will be sent through the tunnel once the remote user is connected. If you want to allow remote users to access the Internet once they are connected then you need to configure split tunneling.
We will configure an access-list that specifies what networks we want to reach through the tunnel:. Now we can configure the anyconnect group policy:. After the group policy configuration we have to create a tunnel group which binds the group policy and VPN pool together:. When the remote user connects, the ASA will show a group name to the remote user, we can specify the group name like this:.
Also, as the number of simultaneous connections increases, the maximum number of VPN connections for that usage model may be reached. If the maximum number of VPN connections is reached, subsequent new connections will be rejected. If there are more connections than expected, you may need to investigate where the connections are coming from, and disconnect or distribute connections as needed and add ASAs.
You can use the show vpn-sessiondb summary command to check the current number of VPN sessions, the number of peak sessions, the capacity of the device used , and so on.
You can see that. You can check how many sessions are currently exchanging data by checking the Active number.
You can check the peak number of AnyConnect connections by checking Peak Concur. You can see the throughput and average packet size for each interface on the ASA with the show traffic command.
For example, the following is a sample output of the show traffic command when uploading bytes of UDP data at a speed of about 23 Mbps from the AnyConnect terminal to the file server via the ASA.
I am using DTLS default for data transfer. In the above example, the DMZ side file server side has about 23 Mbps of traffic and the average packet size is bytes, which can be seen from the show traffic command.
Also, if the average packet size to be exchanged is small, it can be seen that a huge packet exchange of nearly 23, packets per second is required to obtain the throughput of 23Mbps. The larger the number of packets processed, the more time it takes for DTLS encryption, decryption, and processing on both the ASA and AnyConnect terminals, resulting in an increase in the CPU load on each device and a decrease in performance.
On the Outside side Internet side , you can see that the traffic has increased by about 17 Mbps and the average packet size has also increased by 90 bytes due to the overhead of DTLS encryption. In particular, as the number of packets to be exchanged increases and the size of each packet decreases, the DTLS overhead occupying the line band increases, and the line band is squeezed.
The above is the data when using the light "DTLS" for data transfer. It increases between the terminal and ASA. When using a high-end machine that supports tuning of cryptographic processing engines, you can check the processing load status of each cryptographic processing engine and its core by using the " show crypto accelerator load-balance ssl " command.
Cryptographic processing performance is improved by distributing and processing each engine and core. The higher the model, the more engines and cores for cryptographic processing. You can download it from the URL below.
To download the software, it is necessary that your account is linked to an appropriate contract. For the ASA and ASAX series, if the Activation key of the AnyConnect license is not enabled in hardware, the maximum number of remote access VPN terminations is 2 in the single configuration and 4 in the redundant configuration.
Limited to one. After that, you will receive mail, which has activation-key. If you do not have an AnyConnect license and you need to use AnyConnect in a hurry as part of measures against corona virus COVID , you can remove the default connection limit for up to 13 weeks by referring to the following document.
This application is possible until July 1, as of April If you wish to continue using it for more than 13 weeks, you need to purchase and reapply the AnyConnect license. When the restriction is released, the number of remote access VPNs that can be terminated by show version is released up to the maximum value of the hardware used. The emergency license is a time-based license. The license you purchase and apply for the AnyConnect license is perpetual.
If both are applied at the same time, the permanent license will be automatically used after the time-based license expires. However, AnyConnect connection is possible up to the maximum number of connections of the terminating ASA.
However, use of more than the number of contract users is a license violation, so if you expect to use more than the number of AnyConnect license users you have, please purchase additional licenses. Connections that exceed the limit are rejected. Therefore, it is recommended to select a device with a sufficient number of simultaneous connections. If the number of devices that can be connected simultaneously is less than the number of terminals that use a remote access VPN, consider a configuration change such as upgrading or adding an ASA.
Please set the address pool with a margin. The Parent-Tunnel is a special tunnel used for exchanging information when connecting for the first time, controlling for Reconnect, and upgrading AnyConnect image. For example, FTD does not support authentication by the local user database, so an external authentication server is required.
On the other hand, when using ASA, it supports the full functionality of AnyConncet, and various tunnings and performance optimizations described in this document are possible. The reason why the throughput does not appear on the terminal side even though there is sufficient VPN processing performance on the ASA side is often due to the terminal performance, the speed and quality of the communication route, and the communication method using TLS, etc.
Check if the CPU usage of the terminal core is high. Note that the lower the maximum speed of each AnyConnect terminal, the lower the total throughput when the AnyConnect terminals connect simultaneously, so the load on the ASA side will be lower. Also, in the case of teleworking, it is usually more important to "ensure a throughput that is the minimum required for each terminal to perform its work" rather than "maximize the speed of each terminal".
The compression function is a very old function and is a technology that is intended for use on low-speed WAN lines. As of , this function will not be used under the mainstream high-speed internet connection. If you use compression on a high-speed line, compression processing may cause delays or slowdowns. Therefore, do not enable the compression function without the instruction or support of an engineer. Also, this function is disabled by default.
As you can expect, physical appliances typically have their own crypto engine and have a different architecture than the ASAv. Therefore, it may not be possible to expect as much performance improvement as the ASAv. Therefore, it is recommended to perform a preliminary verification according to the usage environment, if necessary. It can be confirmed by connecting AnyConnect with debug webvpn anyconnect enabled.
The following is an excerpt of an example debug output. Most of the ASAs released in are multi-core models, and the processing capacity is improved by distributing and processing with multiple cores.
When testing in a single flow, processing speed is limited because only some cores are used. Especially in the case of higher models, dozens to hundreds of AnyConnect connections are required to maximize the processing performance of the ASA.
VPN throughput is the sum of transmission tx and reception Rx. If you want to obtain Mbps performance for both sending and receiving, you need to select a model with VPN throughput of Mbps or more. If you want to test the performance of AnyConnect on a high-end model, pre-enable the crypto engine accelerator-bias ssl command.
If this command is not enabled, the maximum SSL processing performance will not be obtained. The data in the data sheet is based on the test results with the minimum simple settings.
If there is a difference in Performance after enabling a function or setting compared to when the function or setting of the device is simple minimum setting in almost default state , the difference affects the usage function, setting, environment, etc.
It can be considered that the load caused by is that Performance has decreased. If your network has an average packet size smaller than bytes, performance may be lower than the data sheet.
You can see the average packet size for each interface with the show traffic command. In the case of networks with many short packets, a common problem is the communication method and behavior of the application being used. As a countermeasure, it is possible to improve VPN performance of both the AnyConnect client and ASA as a result by increasing the amount of data in one packet sent at one time on the application side and reducing the frequency of acknowledgments.
However, in general, it is often difficult to immediately modify or enhancement the communication method on the application side. For cloud-type applications, it is also effective to let the client directly access the cloud through a split tunnel and not send short packets to the VPN. Especially in a business-critical environment, when it is expected to use many functions and settings, or in an environment where many applications with many short packets are used, it is recommended to select and introduce a device with sufficient performance capacity.
Unfortunately it is not supported. If you try to set the tunnel-group QoS, the following error occurs and you cannot set it. In addition, the use of QoS leads to equipment load. Therefore, if you want to limit the download speed via the tunnel of the AnyConnect terminal for some reason, you can limit the download speed and the number of simultaneous downloads on the connected file server, and set the QoS for the IP address and segment assigned to the AnyConnect terminal.
It is effective to maintain the performance of the entire system by distributing the processing load by using the device of the route for example, L3 switch accommodating ASA or another device of the route. Buy or Renew. Find A Community. Cisco Community. If your network is live, make sure that you understand the potential impact of any command. The packet capture process is useful when you troubleshoot connectivity problems or monitor suspicious activity.
In addition, you can create multiple captures in order to analyze different types of traffic on multiple interfaces.
This section provides information that you can use in order to configure the packet capture features that are described in this document. Note : Use the Command Lookup Tool registered customers only in order to obtain more information on the commands used in this section. Note : The IP addressing schemes that are used in this configuration are not legally routable on the Internet. They are RFC addresses that are used in a lab environment. Note : This example configuration is used in order to capture the packets that are transmitted during a ping from User1 inside network to Router1 outside network.
Ensure that you disable the capture after you generate the capture files that are needed in order to troubleshoot. In order to view the captured packets, enter the show capture command followed by the capture name. This section provides the show command outputs of the capture buffer contents. The show capture capin command shows the contents of the capture buffer named capin :.
The show capture capout command shows the contents of the capture buffer named capout :. Tip : When you troubleshoot an issue with the use of packet captures, Cisco recommends that you download the captures for offline analysis.
Cisco bug ID CSCuv has been filed to add the ability to stop a capture without completely disabling it and to control when a capture starts to capture traffic. Skip to content Skip to search Skip to footer. Available Languages.
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