Client deauth when Force DHCP enabled [issue ER-4992 is back]

[Anonymous]

Android client is deauthenticated when roaming within same subnet. This behaviour is reproducible when Force DHCP enabled. 

Issue ER-4992 was fixed in firmware 9.13.3 (MR3 Refresh4) but is back in latest firmware 10.1.1.0 for ZD1200.

When Force DHCP is disabled, no issues with roaming. But this will cause unwanted clients with static IPs connecting to our network.


Background of ER-4992:
Resolved an issue where, if Force DHCP was enabled, clients would be deauthenticated after roaming to another AP if the VLAN after roaming was the same as the previous VLAN. [ER-4992]

[michael_brado]

That's definitely a bug!  Do you have a case, and I would insist on an image with the bug fix?

[Anonymous]

Hi Michael, See my reply below.

[Anonymous]

Here's the case number: Case #00822526

Steps to reproduce:

1. Setup the topology as attached in picture below. Everything in the SAME subnet.
2. Setup ZD1200 with firmware 10.1.1.0 build 42. Configure your WLAN SSID using the config below.
3. Go to Wireless LANs > Edit WLAN > enable “Enable Force DHCP, disconnect client if client does not obtain valid IP in 30 secs”. See screenshot below.
4. Your wifi should be internet enabled (means user can browse any internet websites from their device)
5. Connect an Android device to your wifi. Open Terminal on Android and ping your router IP continously.
6. Make the Android device roam from one AP to another. If you have space constraints, contact Ruckus Development/Engineering team lead on best practices to test device roaming.
7. Notice after roaming to another AP, the Android device cannot ping router IP. Android device has NO internet. [Not OK].
8. Go to Wireless LANs > Edit WLAN > DISABLE “Enable Force DHCP, disconnect client if client does not obtain valid IP in 30 secs”.
9. Android device immediately resumes pinging router IP.
10. Go to Wireless LANs > Edit WLAN > ENABLE “Enable Force DHCP, disconnect client if client does not obtain valid IP in 30 secs”.
11. Immediately, Android device cannot ping router IP. Android device has NO internet. [Not OK].
12. Question: Why does “Enable Force DHCP” affects android devices?

WLAN Service:
  ID:
    1:
     
  NAME = Employees
     
  Tx. Rate of Management Frame(2.4GHz) = 24.0Mbps
     
  Tx. Rate of Management Frame(5GHz)   = 24.0Mbps
     
  Beacon Interval = 100ms
     
  SSID = Employees
     
  Description = Employees
     
  Type = Standard Usage
     
  Authentication = open
     
  Encryption = wpa2
     
  Algorithm = aes
     
  Passphrase = hidden
     
  FT Roaming = Disabled
     
  802.11k Neighbor report = Disabled
     
  Web Authentication = Disabled
     
  Authentication Server = Disabled
     
  Called-Station-Id type = wlan-bssid
     
  Tunnel Mode = Disabled
     
  Background Scanning = Enabled
     
  Max. Clients = 500
     
  Isolation per AP = Disabled
     
  Isolation across AP = Disabled
     
  Zero-IT Activation = Disabled
     
  Priority = High
     
  Load Balancing = Enabled
     
  Band Balancing = Enabled
     
  Dynamic PSK = Disabled
     
  Rate Limiting Uplink = Disabled
     
  PerSSID Rate Limiting Uplink = 0
     
  Rate Limiting Downlink = Disabled
     
  PerSSID Rate Limiting Downlink = 0
     
  Auto-Proxy configuration:
       
  Status = Disabled
   
    Inactivity Timeout:
         
  Status = Enabled
         
  Timeout = 30 Minutes
     
  VLAN-ID = 1
     
  Dynamic VLAN = Disabled
     
  Closed System = Disabled
     
  Https Redirection = Disabled
     
  OFDM-Only State = Enabled
     
  Multicast Filter State = Disabled
     
  802.11d State = Enabled
     
  Force DHCP State = Enabled
     
  Force DHCP Timeout = 30
     
  DHCP Option82:
         
  Status = Disabled
         
  Option82 sub-Option1 = Disabled
         
  Option82 sub-Option2 = Disabled
         
  Option82 sub-Option150 = Disabled
         
  Option82 sub-Option151 = Disabled
     
  Ignore unauthorized client statistic = Enabled
     
  STA Info Extraction State = Enabled
     
  BSS Minrate = 24.0 Mbps
     
  DTIM period = 1
     
  Directed MC/BC Threshold = 5
     
  Call Admission Control State = Disabled
     
  PMK Cache Timeout= 720 minutes
     
  PMK Cache for Reconnect= Enabled
     
  NAS-ID Type= wlan-bssid
     
  Roaming Acct-Interim-Update= Disabled
     
  PAP Message Authenticator = Enabled
     
  Send EAP-Failure = Disabled
     
  L2/MAC = Blacklist
     
  L3/L4/IP Address = No ACLS
     
  L3/L4/IPv6 Address = No ACLS
     
  Precedence = Default
     
  Proxy ARP = Enabled
     
  Device Policy = No ACLS
     
  Vlan Pool = No Pools
     
  Role based Access Control Policy = Disabled
     
  SmartRoam = Enabled  Roam-factor = 4
     
  White List = No ACLS
     
  Application Recognition & Control = Enabled
     
  Apply ARC Policy = NO POLICY
     
  Client Flow Data Logging = Disabled

[michael_brado]

Great, please open a ticket and provide your information, so one of our TSEs can assist with tracing the activity.