Steps To Troubleshoot An Ipsec Tunnel Issue

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    In some cases, your system may send a message that the IPsec tunnel needs to be restored. There can be several reasons for this problem. Send a ping to the normally remote gateway to see if the two endpoints can communicate with each other.Check if the VPN service is enabled in the General Settings section.Make sure the tunnel is enabled in the tunnel layout settings.Make sure at least one side, including the tunnel, is configured to start the tunnel.

    How do I check my IPsec tunnel status on ASA?

    The command is to show crypto isakmp sa.The command is to show crypto ipsec sa.command plus system:running-config.The command is to show the used cryptomap.Command – Show IPsec cryptographic statistics.

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    In this content, I wanted to describe the troubleshooting steps for a site-to-site VPN tunnel. Most VPN devices provide electrical engineers with a lot of debugging information to help diagnose the problem.

    I enjoy working with the CLI (command line) and I like the Cisco firewall the most. I have successfully created VPN tunnels consisting of Cisco ASA, SonicWALL, Cyberoam, Checkpoint, Palo-Alto and many more. It doesn’t matter to an IT network engineer which VPN VPN device you use at each end of the VPN site. When creating VPN tunnels in general, we run into some common problems, and usuallyBut there is a set of checks that need to be confirmed in the event of a tunnel failure that are configured.

    There Are Four Most Common Aspects That We Usually Encounter When Using An Air Tunnel VPN.

  • Stage 1 Security Authorities (ISACMP) not operational
  • Phase 2 security organizations (IPsec) fail
  • VPN tunnel established but no visitors coming through
  • Periodic VPN pass in addition to shutdown
  • troubleshoot ipsec tunnel

    In most cases, a dedicated engineer can set up a remote end channel. Therefore, make sure that the configuration of phase 1 and phase 2 is identical, including both sides of the tunnel. It would be helpful if we could also use a shared VPN and exchange phase 1 and phase 2 SA (security association) information between two recipients before setting up a VPN tunnel.

    First step if the first phase of the tunnel fails. Make sure the cipher authentication, destination, hashes, time to live, etc. are the same for both ends of our phase 7 tunnel proposal.

  • ISAKMP settings match exactly.
  • Pre-shared keys thenmatch perfectly.
  • The external route to the peer, or the peer’s IP address, must be pingable from someone’s firewall.
  • Enable home interfaces on isakmp.
  • ESP traffic allowed on public interface
  • UDP port 500 is open to all external ACLs
  • In some cases, the UDP 4500 interface must be open for your current environment.
  • ISAKMP (IKE Phase 1) Negotiation Status And/or MM_WAIT_MSG Messages

    MM_WAIT_MSG2 – The initiator has sent encryption, hashes, and DH (Diffie-Hellman) protection to the responder and is waiting for the first response from the other gateway. If the initiator is set to MM_WAIT_MSG2, then the remote fix is ​​not responding to the initiator. This can happen for the following reason.

  • Routing problem at selected end.
  • Remote end not configured, ISAKMP enabled externally.
  • Invalid remote gateway IP address
  • The firewall is blocking the Internet somewhere in the middle
  • ISAKMP blocking firewall (usually UDP port 500)
  • Remote recovery host not working
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  • MM_WAIT_MSG3 – The initiator has received its IKE policy back to the masterrecipient. The initiator sends encryption, hash, DH, and IKE policy information to maintain the first contact. The initiator will wait for MM_WAIT_MSG2 until it receives a response from the receiver. The tunnel is stuck on MM_WAIT_MSG3 for the following reason.

  • Vendor device mismatch
  • Firewall coming
  • Incompatible ASA style.
  • No return to boot device
  • MM_WAIT_MSG4 – The initiator has now received the IKE policy and is sending the actual pre-shared key to the recipient. The initiator can now potentially remain at MM_WAIT_MSG4 until it receives a pre-shared key from the recipient. If the recipient has not configured a tunnel group or pre-shared key in any way, the initiator remains at MM_WAIT_MSG4.
    Are any of the following reasons why the pipeline hangs on MM_WAIT_MSG4?

  • Missing tunnel class
  • Pre-shared key mismatch on recipient side.
  • How do I check my IPsec tunnel status?

    To view status information about active IPsec tunnels, use the Confirm ipsec Tunnel command. This command takes a photo of the status output for all IPsec links and also supports printing tunnel information individually by providing the tunnel ID.

    MM_WAIT_MSG5 – The initiator has received its pre-shared key provided by the hash recipient. If the recipient has a land tunnel and a PSK,configured for the peer address of the primary initiator, it actually sends the PSK hash to the initiator. If the PSKs do not match, the recipient keeps MM_WAIT_MSG5. There are following reasons why the tunnel hangs on MM_WAIT_MSG5

  • Initiator sees which pre-shared keys don’t match
  • NAT-T is enabled but should also be disabled
  • troubleshoot ipsec tunnel

    MM_WAIT_MSG6 – The initiator accesses the pre-issued key when the hashes match. If there is a match, the state of the initiator of the pre-shared key becomes MM_ACTIVE and is then confirmed by the recipient. If the pre-shared key does not really match, the initiator remains at MM_WAIT_MSG6. There are following reasons why a channel hangs on MM_WAIT_MSG6

  • Shared key mismatch
  • NAT-T is enabled and should be disabled
  • Note. In the meantime, if the status changes to MM_WAIT_MSG6 and the tunnel goes idle, phase 1 usually ends, but Get phase 2 fails to establish an IPsec connection. Make sure the phase 2 IPSEC building matches both at the end of the tunnel.

    How do I troubleshoot IPsec tunnel FortiGate?

    Check your own devices and cables.Check the FortiGate indicators.Ping FortiGate.Check FortiGate interface environment (NAT/Route mode only)Check the security contract configuration.Checking Static Routing Scheme (NAT/Rout Mode Only)e)

    AM_ACTIVE – receiveThe client has received the mm_active acknowledgement from the initiator and receives MM_ACTIVE. Negotiations with ISAKMP SA are completed and stage 1 is actually completed.

    Phase 2 Security Association (IPsec) Error

    How do I troubleshoot IPsec Paloalto?

    Try to ping or trace a route from the PA’s external consumer interface to the peer’s external interface.Make sure the IKE ID is mapped and mapped correctly.Verify that the policy is in effect to allow IKE and IPSec applications.Some useful commands:

    After all one-way negotiations are complete, you will find the IPsec 2 path. There are a few new things to check.

  • Ensure that the phase 2 offer level algorithm, authentication algorithm or hash and simple lifetime are the same on both sides.
  • Make sure VPN encryption domain (local but remote subnet) must match.
  • Check if a valid ACL should be bound to Crypto Map
  • Check the firewall inside the route locally to extend it within the network/hosted servers.
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    Ipsec 터널 문제를 해결하는 단계
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