Networking

The Networking forum covers all aspects of Networking in Azure, including endpoints, load-balancing, network security, DNS, Traffic Manager, virtual networks, and external connectivity.

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  • If you have any feedback on any aspect of Azure relating to Networking, we’d love to hear it.

    How can we improve Azure Networking?

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    1. Azure Load Balancer to support HTTPS probes

      Currently it is not possible to utilise a HTTPS (port 443) probe against a backend pool and as a result you must use either port 80 or a TCP probe which isn't the same as actually making a HTTPS request and testing the HTTP response code.

      463 votes
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        10 comments  ·  Load Balancing  ·  Flag idea as inappropriate…  ·  Admin →
      • Provide explicit drain stop capabilities for Load Balancing.

        Many on-prem systems rely on an ability to gracefully drain traffic from a node before removing it from load balancing for updates or maintenance. While there are workarounds today for the Azure Load Balancing infrastructure (http://serverfault.com/questions/686095/gracefully-take-a-server-out-of-azure-load-balancer-drain-stop) it's not as flexible as existing on-prem services. Please add this feature.

        245 votes
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          4 comments  ·  Load Balancing  ·  Flag idea as inappropriate…  ·  Admin →
        • Support SNAT on internal Azure load Balancer

          Currently it seems Azure Internal Load Balancer does not support Source NAT.
          this mean that if 2 different services hosted on 2 different VM and the VM are on the same vnet the traffic is not load balanced if the ILB route the traffic to the same VM that start the request.
          example:
          Service A (exposed on port x) and B (exposed on port y) are hosted on VM 1 and VM2 on the same vnet.
          Service A has VIP z and Service B has VIP m.
          if service A is recalled via VIP z from VM 1 and ILB…

          159 votes
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            4 comments  ·  Load Balancing  ·  Flag idea as inappropriate…  ·  Admin →
          • Increase Idle Timeout on Internal Load Balancers to 120 Mins

            We use Azure Internal Load Balancers to front services which make use of direct port mappings for backend connections that are longer than the 30 min upper limit on the ILB. That is, our ILBs accept port connections on a nominated set of ports and pass those connections to the backend services running on the same ports.
            We are experiencing dropped TCP connections from clients connecting to the backend services via the ILB. After investigating the issue in collaboration with the Azure Networking Team it was verified that altering the default OS TCP keep alive duration to below 30mins would…

            124 votes
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              under review  ·  1 comment  ·  Load Balancing  ·  Flag idea as inappropriate…  ·  Admin →
            • HA Ports for Standard load balancers with Public IP

              Current review of HA ports only supports Internal LB without any public IP attached. The majority of NVA deployments are with Public IP attached to the LB.

              100 votes
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                5 comments  ·  Load Balancing  ·  Flag idea as inappropriate…  ·  Admin →
              • Allow ICMP ping to VIP (Allow Ping inbound)

                Vote for allowing UDP through the firewall. Such as ping inbound, because the ping are the minimal required for so much app.

                43 votes
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                  1 comment  ·  Load Balancing  ·  Flag idea as inappropriate…  ·  Admin →
                • Allow Upgrade or Swap VIP also when number of endpoints has been changed

                  Or allow the external IP address to be fixed/allocated to the Hosted Service.

                  The scenario is that during the lifetime of the application you may need to modify the number of endpoints, and re-deploy the solution BUT KEEP PUBLIC IP.

                  The best would be if Swap VIP could handle this - to avoid downtime, but I am willing to have some downtime as long as Upgrade is supported. This is to avoid service unavailable during the time DNS CNAME records are updated.

                  41 votes
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                    4 comments  ·  Load Balancing  ·  Flag idea as inappropriate…  ·  Admin →
                  • Custom Destination on load balancer failure

                    It would be good if when the loadbalancer probe fails (It can't reach any page in a timely fashion) it could redirect to a failureURL. This way in the event that something is going wrong customers could still be given a brandend friendly error message or be assured we are working on it.

                    37 votes
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                      1 comment  ·  Load Balancing  ·  Flag idea as inappropriate…  ·  Admin →
                    • fail over active flows from unhealthy to healthy nodes

                      In the context of HA ports, we want to use it to loadbalance traffic through a state-synchronized cluster of firewalls. But today the LB itself does not fail over active TCP sessions. This makes state-synchronization on the firewall side useless, and results in hanging TCP sessions when a node fails.

                      27 votes
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                        under review  ·  2 comments  ·  Load Balancing  ·  Flag idea as inappropriate…  ·  Admin →
                      • Zero Downtime Deploys with Azure Load Balancer

                        Currently, Azure Load Balancer does not support any way to programatically mark a node unhealthy or otherwise remove it from the pool temporarily during maintenance. Meaning you have to accept errors to your end users while deploying. It'd be great to either allow a request from the node, or a secondary health check to mark a node as unhealthy without it actually sending errors back to the user.

                        22 votes
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                          under review  ·  0 comments  ·  Load Balancing  ·  Flag idea as inappropriate…  ·  Admin →
                        • Standard Load Balancer should support using an "internal" IP address for probing the ports.

                          The Standard Load Balancer and HA ports are are recommended for load balancing firewall appliances. However, the Load Balancer probe uses a common IP address for internal and external load balancers. This means that only the internal or external ports can be load balanced, which means that a messy Zookeeper alternative must be built to monitor the firewall availability.

                          16 votes
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                            2 comments  ·  Load Balancing  ·  Flag idea as inappropriate…  ·  Admin →
                          • http probing SharePoint VMs

                            Hi,
                            we have an Azure IaaS dev SharePoint farm and we use Azure Load balancer to handle visitors trafic. We need to probe the SharePoint VMs using http (to get http return codes from a specific SharePoint page) and we discovered that to make http probing work, we had to add an unrelated 100.64.0.0/10 IP to the internal SharePoint alternate access mappings, which turned out to be the VM's physical host private Ip address.
                            Problem is, we shut down the dev VM at night and when they're restarted, they're reallocated to a new host and then refuse to answer correctly…

                            9 votes
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                              4 comments  ·  Load Balancing  ·  Flag idea as inappropriate…  ·  Admin →
                            • Load Balancing on Linux servers - net.ipv4.tcp_tw_recycle & reuse settings

                              Currently you don't allow net.ipv4.tcp_tw_recycle, net.ipv4.tcp_tw_reuse and net.ipv4.tcp_tw_timestamps to be set to 1. You require them to be set to default 0. For our MapR performance improvements, we are required to set them to 1 - which prevents the wait time for the socket to become available and reuses existing.

                              It will be nice if you could allow us to use the Load Balancer even when we set the reuse and recycle flag to 1.

                              7 votes
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                                1 comment  ·  Load Balancing  ·  Flag idea as inappropriate…  ·  Admin →

                                Thank you for suggesting this. I have added this is to feature backlog and we need to investigate further if this can be addressed or how. Please follow current support guidance for now to set these kernel variables as follows:

                                net.ipv4.tcp_tw_recycle = 0
                                net.ipv4.tcp_tw_reuse = 0
                                net.ipv4.tcp_timestamps = 0

                              • 6 votes
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                                  1 comment  ·  Load Balancing  ·  Flag idea as inappropriate…  ·  Admin →
                                • Azure load balancer probe service

                                  Currently you need to provide a custom probe service or use applications (e g SQL Always-On Availability Group) which has built-in probe services or use other services' ports (e g RPC 135) for the probe service. Would it be possible to provide a probe service application that you can install as a service on the nodes instead of having to write your own probe service? I have seen some C# samples of such TCP port probe services, which you could install as a service, but it would be better to have official in case there are improvements, updates or changes…

                                  6 votes
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                                    0 comments  ·  Load Balancing  ·  Flag idea as inappropriate…  ·  Admin →
                                  • Priority as distribution mode in Load Balancers

                                    With the introduction of the HA ports in load balancers it would be great to have a priority option in the load balancers in order to be able to use NVA's in active-passive for scenarios where doing NAT to ensure route symmetry is not an option.

                                    This will send all the traffic always to the same NVA and if it goes down it will start sending all the traffic to the second one.

                                    Today this is archived with external tools to monitor the state of the NVAs and with UDRs (zookeper for example).

                                    Distribution by priority is something really usual…

                                    6 votes
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                                      0 comments  ·  Load Balancing  ·  Flag idea as inappropriate…  ·  Admin →
                                    • Active / passive load balancing without the dependency of the cluster service.

                                      Active / passive load balancing without the dependency of the cluster service.

                                      4 votes
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                                        1 comment  ·  Load Balancing  ·  Flag idea as inappropriate…  ·  Admin →
                                      • Powershell Command for Associating Backend Pools to InboundNAT rules on a Load Balancer

                                        Need a PowerShell command to allow association of an existing Backend Pool to an InboundNAT rule as currently this can only be achieved manually after rule creation and is extremely tedious and time consuming.

                                        3 votes
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                                          0 comments  ·  Load Balancing  ·  Flag idea as inappropriate…  ·  Admin →
                                        • Provide a Cross DataCenter Load Balancer

                                          We are using the Traffic Manager (Priority) for DNS routing to a new Data Center in case of a failure of our primary WebApp deployment.
                                          TM is configured with a 30s timeout which works great however Chrome (and IE) have their own internal DNS caching so users already using the site keep sending requests to the old site.
                                          Issue is described here: https://social.msdn.microsoft.com/forums/azure/en-us/3a18c2b9-f335-4ef8-8271-80968dd4b64f/traffic-manager-and-web-browser-dns-caching
                                          I know this is a know limitation of TM but would be nice to have some sort of cross dc balancer so we can safely DR between locations without outages.

                                          3 votes
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                                            under review  ·  0 comments  ·  Load Balancing  ·  Flag idea as inappropriate…  ·  Admin →
                                          • On Azure portal,under Load balancer the statement of floating IP should be updated.

                                            Recently i took a case ,customer complained this .On Azure portal,under Load balancer the statement of floating IP "says 'We recommend using this feature only when configuring a SQL Always" needs to be updated.
                                            The statement needs to be updated as follows :
                                            We recommend using this feature only when configuring a SQL AlwaysOn Availability Group Listener and SQL Failover Clustered Instance (FCI) IP Address.

                                            The current statement appears to be old and was true before we started supporting SQL FCI on Azure. You can see the details here
                                            https://docs.microsoft.com/en-us/azure/virtual-machines/windows/sql/virtual-machines-windows-portal-sql-create-failover-cluster

                                            1 vote
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                                              0 comments  ·  Load Balancing  ·  Flag idea as inappropriate…  ·  Admin →
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