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Vitali Isaev
Vitali Isaev

Direct Connet


B2B direct connect requires a mutual trust relationship between two Azure AD organizations to allow access to each other's resources. Both the resource organization and the external organization need to mutually enable B2B direct connect in their cross-tenant access settings. When the trust is established, the B2B direct connect user has single sign-on access to resources outside their organization using credentials from their home Azure AD organization.




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Currently, B2B direct connect capabilities work with Teams shared channels. When B2B direct connect is established between two organizations, users in one organization can create a shared channel in Teams and invite an external B2B direct connect user to it. Then from within Teams, the B2B direct connect user can seamlessly access the shared channel in their home tenant Teams instance, without having to manually sign in to the organization hosting the shared channel.


The default cross-tenant access settings apply to all external Azure AD organizations, except organizations for which you've configured individual settings. Initially, Azure AD blocks all inbound and outbound B2B direct connect capabilities by default for all external Azure AD tenants. You can change these default settings, but typically you can leave them as-is and enable B2B direct connect access with individual organizations.


For this scenario to work, Fabrikam also needs to allow B2B direct connect with Contoso by configuring these same cross-tenant access settings for Contoso and for their own users and applications. When configuration is complete, Contoso users who manage Teams shared channels will be able to add Fabrikam users by searching for their full Fabrikam email addresses.


Starting from the example above, Contoso could also choose to allow only the Fabrikam Marketing group to collaborate with Contoso's users through B2B direct connect. In this case, Contoso needs to obtain the Marketing group's object ID from Fabrikam. Then, instead of allowing inbound access to all Fabrikam's users, they'll configure their Fabrikam-specific access settings as follows:


Fabrikam will also need to configure their outbound cross-tenant access settings so that their Marketing group is allowed to collaborate with Contoso through B2B direct connect. When configuration is complete, Contoso users who manage Teams shared channels will be able to add only Fabrikam Marketing group users by searching for their full Fabrikam email addresses.


In a B2B direct connect scenario, authentication involves a user from an Azure AD organization (the user's home tenant) attempting to sign in to a file or app in another Azure AD organization (the resource tenant). The user signs in with Azure AD credentials from their home tenant. The sign-in attempt is evaluated against cross-tenant access settings in both the user's home tenant and the resource tenant. If all access requirements are met, a token is issued to the user that allows the user to access the resource. This token is valid for 1 hour.


If you want to allow B2B direct connect with an external organization and your Conditional Access policies require MFA, you must configure your inbound trust settings so that your Conditional Access policies will accept MFA claims from the external organization. This configuration ensures that B2B direct connect users from the external organization are compliant with your Conditional Access policies, and it provides a more seamless user experience.


For example, say Contoso (the resource tenant) trusts MFA claims from Fabrikam. Contoso has a Conditional Access policy requiring MFA. This policy is scoped to all guests, external users, and SharePoint Online. As a prerequisite for B2B direct connect, Contoso must configure trust settings in their cross-tenant access settings to accept MFA claims from Fabrikam. When a Fabrikam user accesses a B2B direct connect-enabled app (for example, a Teams Connect shared channel), the user is subject to the MFA requirement enforced by Contoso:


In the resource organization, the Teams shared channel owner can search within Teams for users from an external organization and add them to the shared channel. After they're added, the B2B direct connect users can access the shared channel from within their home instance of Teams, where they collaborate using features such as chat, calls, file-sharing, and app-sharing. For details, see Overview of teams and channels in Microsoft Teams. For details about the resources, files, and applications that are available to the B2B direct connect user via the Teams shared channel refer to Chat, teams, channels, & apps in Microsoft Teams.


B2B collaboration and B2B direct connect are two different approaches to sharing with users outside of your organization. You can find a feature-to-feature comparison in the External Identities overview, where we discuss some key differences in how users are managed, and how they access resources.


B2B direct connect offers way to collaborate with users from another Azure AD organization through a mutual, two-way connection configured by admins from both organizations. Users have single sign-on access to B2B direct connect-enabled Microsoft applications. Currently, B2B direct connect support Teams Connect shared channels.


B2B collaboration lets you invite external partners to access your Microsoft, SaaS, or custom-developed apps. B2B collaboration is especially useful when the external partner doesn't use Azure AD or it's not practical or possible to set up B2B direct connect. B2B collaboration allows external users to sign in using their preferred identity, including their Azure AD account, consumer Microsoft account, or a social identity you enable such as Google. With B2B collaboration, you can let external users sign in to your Microsoft applications, SaaS apps, custom-developed apps, and so on.


Azure AD includes information about cross-tenant access and B2B direct connect in the organization's Audit logs and Sign-in logs. These logs can be viewed in the Azure portal under Monitoring.


Azure AD sign-in logs Azure AD sign-in logs are available in both the home organization and the resource organization. Once B2B direct connect is enabled, sign-in logs will begin including user object IDs for B2B direct connect users from other tenants. The information reported in each organization varies, for example:


In both organizations, B2B direct connect sign-ins are labeled with a cross-tenant access type of B2B direct connect. A sign-in event is recorded when a B2B direct connect user first accesses a resource organization, and again when a refresh token is issued for the user. Users can access their own sign-in logs. Admins can view sign-ins for their entire organization to see how B2B direct connect users are accessing resources in their tenant.


Teams access reviews: Access reviews of Groups that are Teams can now detect B2B direct connect users who are using Teams shared channels. When creating an access review, you can scope the review to all internal users, guest users, and external B2B direct connect users who have been added directly to a shared channel. The reviewer is then presented with users who have direct access to the shared channel.


Current limitations: An access review can detect internal users and external B2B direct connect users, but not other teams that have been added to a shared channel. To view and remove teams that have been added to a shared channel, the shared channel owner can manage membership from within Teams.


B2B direct connect lets your users and groups access apps and resources that are hosted by an external organization. To establish a connection, an admin from the external organization must also enable B2B direct connect.


Dedicated Connections: 1 Gbps, 10 Gbps or 100 Gbps physical Ethernet ports dedicated to a single customer that supports 50 private or public virtual interfaces (VIF) and 1 transit VIF. To increase capacity, Dedicated Connections can be combined using Link Aggregation Groups. AWS Direct Connect Delivery Partners can help you order Dedicated Connections directly from the AWS Console, CLI, or API.


A Hosted VIF is assigned to a different AWS account than the AWS account assigned to the Dedicated Connection, and have no capacity assigned by AWS. Some AWS Direct Connect Delivery Partners enable access to AWS Direct Connect by creating Hosted VIFs assigned to your AWS account. A Hosted VIF will not become active until you accept it in the AWS Console, CLI, or API. AWS Direct Connect Delivery Partners provision each Hosted VIF over a network link between them and AWS, shared by multiple customers. Each Hosted VIF has access to all available capacity on the network link in the direction from AWS to the AWS Direct Connect Delivery Partner. It is possible to oversubscribe the shared network link because AWS does not limit network traffic capacity on each Hosted VIF. As a result, AWS no longer allows new AWS Direct Connect Delivery Partner service integrations using Hosted VIFs. AWS recommends you use Dedicated Connections or Hosted Connections if you have workloads sensitive to network congestion.


AWS Direct Connect links your internal network to an AWS Direct Connect location over a standard Ethernetfiber-optic cable. One end of the cable is connected to your router, the other to anAWS Direct Connect router. With this connection, you can create virtualinterfaces directly to public AWS services (for example, to Amazon S3) or toAmazon VPC, bypassing internet service providers in your network path. An AWS Direct Connect locationprovides access to AWS in the Region with which it is associated. You can use a singleconnection in a public Region or AWS GovCloud (US) to access public AWS services in all otherpublic Regions.


(Optional) You can configure Bidirectional Forwarding Detection (BFD) on your network. BFD is a feature of BGP that applies to both public and private transit virtual interfaces. Asynchronous BFD is automatically enabled for AWS Direct Connect virtual interfaces, but does not take effect until you configure it on your router. For more information, see Enable BFD for a Direct Connect connection. 041b061a72


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