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Surface Pro clients unable to get an IP address from their DHCP server, connections drop off at random intervals.

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TitleSurface Pro clients unable to get an IP address from their DHCP server, connections drop off at random intervals.
Symptoms
  • Surface Pro devices dropping off the network.
  • All devices slow to get a new IP when connected to a new Topology.
  • AP lock-up, no users can connect.
Environment
  • ExtremeWireless appliance, V2110.
  • AP3935
  • firmware 10.01.06, 10.11.02, 10.11.03
Cause
  • Traffic profile packet captures showed an inordinate amounts of broadcast and multicast traffic.
  • Devices were not hearing the replies from the AP for DHCP, ARP, or gateway requests.
  • AP radio buffer exhaustion when over 90 users connecting, and requesting DHCP, ARP replies.
Resolution
  • The following changes were extensively tested at one site. The settings used below may differ in other environments, and are listed here as guidelines to try when troubleshooting the Surface Pro Connections:
    • If the network is a flat domain, consider moving certain areas into its own Topology subnet and VNS profile.
    • Radio settings modified:
      • Probe Suppression and Force Disassociate enabled, threshold set to -75 Radio 1, -80 Radio2.
      • Multicast to Unicast set to enable/auto.
      • TXBF (Radio 1 Advanced) set to Disabled.
      • MBR set to 6 Mbps, Radio 1, and 12 Mbps Radio 2.
      • N-protection type set to RTS-CTS.
      • DTIM = 2.
      • Guard Interval set to Short.
    • Proxy ARP enabled on Topologies.
  • Please upgrade to 10.11.04 or higher.
Additional notes

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