cisco asa remote access vpn troubleshooting commands

With multiple sessions running on a remote access VPN, troubleshooting can be difficult given the size of the logs. You can use the debug webvpn condition command to set up filters to target your debug process more precisely. debug webvpn condition {group name | p-ipaddress ip_address [ {subnet subnet_mask | prefix length}] | reset | user name}

Full Answer

How to setup a remote access VPN?

Use a VPN Router with the built-in VPN server capability

• Launch a browser window from your PC connected to the routers’ network
• Enter the router IP address in the search to login into your router
• Enter the username and password of your router and login into it.
• Go to the Settings page and select VPN Service or setup page.
• Enable the VPN service by selecting the checkbox and apply

Can the Cisco ASA be used as a router?

The ASA is NOT a router, though and while you can do things on the ASA that can make it act something like a router it is important to understand the differences between true routing and what the ASA actually does.

How to connect Cisco ASA on PC?

• Connect the network cable from the modem to port 0 (default outside port) on the ASA.
• Connect your computer to one of the other ports on the ASA, which should be on the inside network by default.
• Open a browser on your computer and go to 192.168.
• Click Run ASDM.
• Log in.

How to setup a Cisco VPN?

How To Setup Vpn Cisco Rv340? February 18, 2022 by Cathie. Select Settings, VPN, and then add a VPN connection. Enter the public WAN IP address provided by your ISP, select a VPN type as PPTP, and enter the user name and password in the section below. The newly created PPTP VPN network adapter must now be connected.

How do I troubleshoot Cisco VPN connection problems?

Cisco VPN not connecting – simple fix without a rebootClose CISCO VPN by right clicking it in the bottom right Windows tray bar.Open windows task manager with CTRL + SHIFT + ESCAPE.Go to services and find vpnagent.Right click it and select STOP, wait for it to stop completely.Right click it again and select START.More items...•

How do I check my VPN traffic on ASA?

Hi, From the CLI use the command "show crypto ipsec sa" and confirm the encaps and decaps counters are increasing to confirm traffic is being sent/received over the VPN tunnel successfully. You can also use packet capture to confirm traffic is sent/received.

What is the command to check IPsec tunnel status in Asa?

To see if the tunnel is up you can use the “show crypto isakmp sa” or “show crypto ipsec sa” command.

How do I check Cisco VPN tunnel status?

From the Wired Client, browse to http://dcloud.cisco.com/ to access the Cisco dCloud UI and then log in with your Cisco.com credentials. Use the Bandwidth Test to verify that the port needed for VPN connectivity (TCP 443) is not blocked at your site.

Which command is used to check VPN tunnel is up or not?

This command “Show vpn-sessiondb anyconnect” command you can find both the username and the index number (established by the order of the client images) in the output of the “show vpn-sessiondb anyconnect” command.

How do I troubleshoot IKEv2?

Suggestions: Troubleshoot connectivity between Aviatrix gateway and peer VPN router. Verify that both VPN settings use the same IKEv2 version. Verify that all IKEv2/IPsec algorithm parameters (i.e., Authentication/DH Groups/Encryption) match on both VPN configuration.

How do I check my IPsec VPN status?

To view status information about active IPsec tunnels, use the show ipsec tunnel command. This command prints status output for all IPsec tunnels, and it also supports printing tunnel information individually by providing the tunnel ID.

How do I troubleshoot Cisco ASA firewall?

Here are some basic ASA firewall troubleshooting tips for network traffic passing through the ASA....Task 4 : Capture IPv6 traffic on ASA firewallConfigure access-list with source and destination IP/ subnet. ... Apply the ACL in capture. ... Send test traffic. ... View the capture.

How do I know if my ASA is blocking ports?

There should not be any overhead on the ASA, also you can use the packet capture utility on the ASA to see if the traffic is indeed being blocked. If you need to allow traffic through the firewall then it would be best to post a seperate discussion in the Firewalling forum.

What does MM_Active mean?

MM_Active means that phase 1 is coming up OK - it's working fine. The role of responder or initiator just means which device initiates the VPN tunnel. Whether your ASA is the one who initiates the VPN tunnel, or the remote peer initiates the VPN tunnel.

What does Mm_no_state mean?

ISAKMP SAs in MM_NO_STATE indicates that the was a main mode failure between IPSec peers and that their IKE phase 1 policies did not match. An excessively large number may be an indication of an attempt to exploit this issue.

What is the difference between IPsec VPN and GRE tunnel?

IPsec provides more comprehensive security for IP tunneling, while GRE tunnels work well when network teams need to tunnel with multiple protocols or multicast. Generic Routing Encapsulation, or GRE, and IPsec both encase packets, but the two protocols have different requirements...

What is Qm_idle state?

Note that these SAs are in "QM_IDLE" state, meaning that the ISAKMP SA is authenticated and can be used for subsequent Quick Mode (Phase 2) exchanges. The ISAKMP SA can exist in a number of other states. These states are described in Table 3-1 for ISAKMP SA negotiation in Main Mode.

What does MM_Active mean?

MM_Active means that phase 1 is coming up OK - it's working fine. The role of responder or initiator just means which device initiates the VPN tunnel. Whether your ASA is the one who initiates the VPN tunnel, or the remote peer initiates the VPN tunnel.

What does Mm_no_state mean?

ISAKMP SAs in MM_NO_STATE indicates that the was a main mode failure between IPSec peers and that their IKE phase 1 policies did not match. An excessively large number may be an indication of an attempt to exploit this issue.

What is Cisco ASA?

Cisco ASA comes with many show commands to check the health and status of the IPSec tunnels. For troubleshooting purposes, there is a rich set of debug commands to isolate the IPSec-related issues.

What does "PHASE 1 COMPLETED" mean in Cisco ASA?

After pushing down the attributes, Cisco ASA displays the "PHASE 1 COMPLETED" message indicating that the ISAKMP SA is successfully negotiated, as demonstrated in Example 16-58.

How to check IPSEC SA?

You can also check the status of the IPSec SA by using the show crypto ipsec sa command, as shown in Example 16-51. This command displays the negotiated proxy identities along with the actual number of packets encrypted and decrypted by the IPSec engine.

How to check if IPSEC tunnels are working?

If you want to see if the IPSec tunnels are working and passing traffic, you can start by looking at the status of Phase 1 SA. Type show crypto isakmp sa detail, as demonstrated in Example 16-50. If the ISAKMP negotiations are successful, you should see the state as AM_ACTIVE.

What happens if NAT-T is not negotiated?

If NAT-T is not negotiated or a NAT/PAT device is not detected, they display the Remote end is NOT behind a NAT device. This end is NOT behind a NAT device message, as shown in Example 16-55. Example 16-55. debug Output to Show NAT-T Discovery Process.

How does a client request mode-config?

The client requests mode-config attributes by sending a list of client-supported attributes, as shown in Example 16-57. Cisco ASA replies back with all of its supported attributes and the appropriate information.

What happens after NAT-T?

After NAT-T negotiations, Cisco ASA prompts the user to specify user credentials. Upon successful user authentication, the security appliance displays a message indicating that the user (ciscouser in this example) is authenticated, as shown in Example 16-56.

How many interfaces does an ASA have?

An ASA has at least two interfaces, referred to here as outside and inside. Typically, the outside interface is connected to the public Internet, while the inside interface is connected to a private network and is protected from public access.

Which crypto protocol allows the IPsec client and the ASA to establish a shared secret key?

Specify the Diffie-Hellman group for the IKE policy—the crypto protocol that allows the IPsec client and the ASA to establish a shared secret key.

What is the default LAN to LAN tunnel group?

There are two default tunnel groups in the ASA system: DefaultRAGroup, which is the default remote-access tunnel group, and DefaultL2Lgroup, which is the default LAN-to-LAN tunnel group. You can change these groups, but do not delete them. The ASA uses these groups to configure default tunnel parameters for remote access and LAN-to-LAN tunnel groups when there is no specific tunnel group identified during tunnel negotiation.

What files can Cisco AnyConnect have?

Virtual File System creation for each context can have Cisco Anyconnect files like Image and profile.

What happens if a Cisco VPN client has a different preshared key size?

If a Cisco VPN Client with a different preshared key size tries to connect, the client logs an error message indicating it failed to authenticate the peer.

What is the first phase of ISAKMP?

Phase 1 creates the first tunnel to protect later ISAKMP negotiation messages. Phase 2 creates the tunnel that protects data travelling across the secure connection.

Do you need a mask for a VPN?

The address mask is optional. However, You must supply the mask value when the IP addresses assigned to VPN clients belong to a non-standard network and the data could be routed incorrectly if you use the default mask. A typical example is when the IP local pool contains 10.10.10.0/255.255.255.0 addresses, since this is a Class A network by default. This could cause routing issues when the VPN client needs to access different subnets within the 10 network over different interfaces.

What is TCP SYN in ASA?

This command allows the ASA device to send any TCP packet (TCP SYN) from any source IP to any destination IP on any port. This is very handy for troubleshooting. In this example, I'm testing connectivity from 10.10.1.10 to example.net (93.184.216.34) on port 80

What is the show crypto ipsec sa command?

The show crypto ipsec sa command shows the IPsec SAs that are built between the peers. The encrypted tunnel is built between IP addresses 2.2.2.2 and 1.1.1.1for the traffic that flows between the networks 10.10.1.0 and 10.20.1.0. You can also see the two ESP SAs built for the inbound and outbound traffic.

What command can you use to identify if traffic is able to traverse through the firewall?

You can use packet-tracer command to identify whether traffic is able to traverse through the firewall.