How to access juniper networks remotly

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You must specify the path to the file from which to import host key information. OpenSSH 7 omits some legacy cryptography. Lack of support for legacy cryptography in devices causes Junos Space device discovery to fail. To work around this issue, configure the device to support the 3des-cbc or blowfish-cbc cipher, or both, and the dh-group1-sha1 key-exchange method.

Junos OS supports the following set of ciphers by default:. In Junos OS , the following ciphers are not supported by default, but you can configure your device to support them. They are listed from the most secure to the least secure:. Junos OS supports the following set of key-exchange methods by default:.

In Junos OS , the following key-exchange methods are not supported by default, but you can configure your device to support them:. By configuring an ordered set of ciphers, key-exchange methods, or message authentication codes MACs , the newly defined set is applied to both server and client commands.

If the management application does not reach a Juniper Networks device, for example, the device being a firewall. In such cases, outbound-ssh can be configured on the Juniper Networks device. An outbound-ssh configuration initiates a reverse SSH connection from server to client to the management application. This outbound SSH connection is closed only after the configuration are removed from the device.

There is no initiation command with outbound SSH. After you configure and commit outbound SSH, the device begins to initiate an outbound SSH connection based on the committed configuration. The device repeatedly attempts to create this connection until successful. If the connection between the device and the client management application is dropped, the device again attempts to create a new outbound SSH connection until successful.

This connection is maintained until the outbound SSH stanza is removed from the configuration. To configure the device for outbound SSH connections, include the outbound-ssh statement at the [edit system services] hierarchy level:.

Each time the router or switch establishes an outbound SSH connection, it first sends an initiation sequence to the management client. This sequence identifies the router or switch to the management client. Within this transmission is the value of device-id. To configure the device identifier of the router or switch, include the device-id statement at the [edit system services outbound-ssh client client-id ] hierarchy level:.

During the initialization of an SSH connection, the client authenticates the identity of the device using the public SSH host key of the device.

When you configure the secret statement, the device passes its public SSH key as part of the outbound SSH connection initiation sequence. When the secret statement is set and the device establishes an outbound SSH connection, the device communicates its device ID, its public SSH key, and an SHA1 hash derived in part from the secret statement. The value of the secret statement is shared between the device and the management client.

The client uses the shared secret to authenticate the public SSH host key it is receiving to determine whether the public key is from the device identified by the device-id statement.

Using the secret statement to transport the public SSH host key is optional. You can manually transport and install the public key onto the client system. Including the secret statement means that the device sends its public SSH host key every time it establishes a connection to the client.

It is then up to the client to decide what to do with the SSH host key if the client already has an SSH key for that device. Host keys can change for various reasons.

By replacing the key each time a connection is established, you ensure that the client has the latest key. The following message is sent by the device when the secret attribute is configured:. To enable the device to send SSH protocol keepalive messages to the client application, configure the keep-alive statement at the [edit system services outbound-ssh client client-id ] hierarchy level:.

When disconnected, the device begins to initiate a new outbound SSH connection. To specify how the device reconnects to the server after a connection is dropped, include the reconnect-strategy statement at the [edit system services outbound-ssh client client-id ] hierarchy level:. You can also specify the number of retry attempts and set the amount of time before the reconnection attempts stop.

To configure the application to accept NETCONF as an available service, include the services netconf statement at the [edit system services outbound-ssh client client-id ] hierarchy level:. To configure the clients available for this outbound SSH connection, list each client with a separate address statement at the [edit system services outbound-ssh client client-id ] hierarchy level:. To use any other routing instance, first configure the routing instance at the [edit routing-instances] hierarchy.

If you do not specify a routing instance, your device will establish the outbound SSH connection using the default routing table. Regular SSH session requests for this port are rejected. To prevent brute force and dictionary attacks, a device performs the following actions for Telnet or SSH sessions by default:.

After the second password retry, introduces a delay in multiples of 5 seconds between subsequent password retries. For example, the device introduces a delay of 5 seconds between the third and fourth password retry, a delay of 10 seconds between the fourth and fifth password retry, and so on. Enforces a minimum session time of 20 seconds, during which a session cannot be disconnected.

Configuring the minimum session time prevents malicious users from disconnecting sessions before the password retry delay goes into effect. Configuring the minimum session time also prevents them from attempting brute force and dictionary attacks with multiple logins.

You can configure the password retry limits for Telnet and SSH access. In this example, you configure the device to take the following actions for Telnet and SSH sessions:. Introduce a delay in multiples of 5 seconds between password retries that occur after the second password retry. Enforce a minimum session time of 40 seconds, during which a session cannot be disconnected.

You need two devices running Junos OS with a shared network link. No special configuration beyond basic device initialization management interface, remote access, user login accounts, etc.

While not a strict requirement, console access to the R2 device is recommended. In this example, you create an IPv4 stateless firewall filter that logs and rejects Telnet or SSH packets sent to the local Routing Engine, unless the packet originates from the The filter is applied to the loopback interface to ensure that only traffic destined to the local device is affected.

You apply the filter in the input direction. An output filter is not used. As a result all locally generated traffic is allowed. To match packets originating from a specific subnet or IP prefix, you use the source-address IPv4 match condition applied in the input direction. To match packets destined for the Telnet port and SSH ports, you use the protocol tcp match condition combined with a port telnet and port ssh IPv4 match conditions applied in the input direction.

Figure 1 shows the test topology for this example. The firewall filter is applied to the R2 device, making it the device under test DUT.

The R1 and the R2 devices share a link that is assigned a subnet of Both devices have loopback addresses assigned from the Static routes provide reachability between loopback addresses because an interior gateway protocol is not configured in this basic example. The following example requires you to navigate various levels in the configuration hierarchy. If you use SSH or Telnet to access the R2 device directly, you will lose connectivity when the filter is applied. We recommend that you have console access when configuring this example.

If needed you can use the R1 device as a jump host to launch an SSH session to R2 after the filter is applied. Alternatively, consider modifying the sample filter to also permit the IP subnet assigned to the machine you use to access the R2 device.

To quickly configure the R1 device, edit the following commands as needed and paste them into the CLI at the [edit] hierarchy level. Be sure to issue a commit in configuration mode to activate the changes. To quickly configure the R2 device, edit the following commands as needed and paste them into the CLI at the [edit] hierarchy level.

Consider using commit-confirmed when making changes that might affect remote access to your device. You also configure Telnet and SSH access:. Complete the following steps to verify and commit your candidate configuration at the R1 device:. Confirm interface configuration with the show interfaces configuration mode command. If the command output does not display the intended configuration, repeat the instructions in this example to correct the configuration. Use the show routing-options and show system services configuration mode commands.

When satisfied with the configuration on the R1 device, commit your candidate configuration. Complete the following steps to configure the R2 device. You begin by defining the stateless firewall filter that selectively blocks Telnet and SSH access:.

This term permits Telnet and SSH from the specified source prefix s :. This term rejects SSH and Telnet from all other source addresses. See Firewall Filter Logging Actions for details on filter logging options. You can use the discard action to suppress generation of ICMP error messages back to the source. See Firewall Filter Terminating Actions for details. Define the filter term tcp-estab.

This term permits outbound access to the Internet to support connections to the Juniper Mist cloud tcp-established is a bit-field match condition, tcp-flags " ack rst " , which indicates an established TCP session, but not the first packet of a TCP connection :. Define the filter term default-term. This term accepts all other traffic. Recall that Junos OS stateless filters have an implicit deny term at their end. The default-term overrides this behavior by terminating the filter with an explicit accept action.

The termination of the filter results in all other traffic being accepted by the filer. For this example we are allowing all other traffic, but for your network you might want to secure the routing engine. See protecting the routing engine for more information. Configure the loopback interface, and apply the filter in the input direction:. Complete the following steps to verify and commit your candidate configuration at the R2 device:. Confirm the configuration of the stateless firewall filter with the show firewall configuration mode command.

Confirm interface configuration and filter application with the show interfaces configuration mode command. Verify the static route used to reach the loopback address of the R1 device, and verify that Telnet and SSH access are enabled. When satisfied with the configuration on the R2 device, commit your candidate configuration.

Confirm that the firewall filter to limit Telnet and SSH access is working properly. Verify that the firewall filter correctly allows SSH and Telnet when the traffic is sourced from the From a host at an IP address within the This packet should be accepted, but the packet header information for this packet should not be logged in the firewall filter log buffer in the Packet Forwarding Engine. By default the R1 device will source the SSH traffic from the egress interface used to reach the destination.

As a result this traffic is sourced from the Verify that the firewall filter correctly rejects SSH and Telnet traffic that does not originate from the Generate SSH traffic sourced from the loopback address of the R1 device. The source address of this traffic is outside of the allowed Use the ssh This packet should be rejected, and the packet header information should be logged in the firewall filter log buffer.

The output shows that the SSH connection is rejected. This output confirms that the filter is generating an ICMP error message and that it correctly blocks SSH traffic when sent from a disallowed source address. Generate Telnet traffic sourced from the loopback address of the R1 device.

Use the telnet This packet should be rejected, and the packet header information for this packet should be logged in the firewall filter log buffer in the PFE. The output shows that the Telnet connection is rejected. This output confirms that the filter is generating an ICMP error message and that it correctly blocks Telnet traffic when sent from a disallowed source address.

Use the show firewall log command to verify that the firewall log buffer on the R2 device contains entries showing that packets with a source address of The output confirms that traffic from the The Action column displays an R to indicate that these packets were rejected. The interface, transport protocol, and source and destination addresses are also listed. These results confirm that the firewall filter is working properly for this example.

Help us improve your experience. Let us know what you think. SSH succeeds Telnet and is the recommended method for remote access. SSH encrypts all traffic, including passwords, to effectively eliminate eavesdropping, connection hijacking, and other attacks.

Cleartext passwords create a potential security vulnerability. If you do not intend to use FTP or Telnet, you do not need to configure them on your device. However, consider that some users might use FTP to store configuration templates, retrieve software, or perform other administrative tasks.

To make it easier to configure these services on multiple devices, configure them inside of a configuration group. To set up remote access and file-transfer services:. Help us improve your experience.

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