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EX SSL-VPN: Netbios broadcasts send by the workplace service for the configured primary and Seconda

03/26/2020 1,055 People found this article helpful 208,898 Views

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    Description

    EX SSL-VPN: Netbios broadcasts send by the workplace service for the configured primary and Secondary WINS Servers

    Resolution

    Problem Definition:

    If the appliance is setup with Primary and Secondary WINS Server (in this example 172.16.252.2, 172.16.252.9), Whenever there is a change on the appliance configurartion the following type of Netbios broadcast query is send by the appliance:-

    13:12:07.202064 IP (tos 0x0, ttl 64, id 26015, offset 0, flags [DF], proto: UDP (17), length: 71) 172.16.251.61.32778 > 172.16.252.2.53: [udp sum ok] 64392+ A?172.16.252.2,172.16.252.9. (43)
    13:12:07.202769 IP (tos 0x0, ttl 128, id 22264, offset 0, flags [none], proto: UDP (17), length: 146) 172.16.252.2.53 > 172.16.251.61.32778: [udp sum ok] 64392 NXDomain q: A? 172.16.252.2,172.16.252.9. 0/1/0 ns: . SOA
    a.root-servers.net. 2010052601 1800 900 604800 898 (118)
    13:12:07.202930 IP (tos 0x0, ttl 64, id 26016, offset 0, flags [DF], proto: UDP (17), length: 79) 172.16.251.61.32778 > 172.16.252.2.53: [udp sum ok] 2048+ A?172.16.252.2,172.16.252.9.ssl.lab. (51)
    13:12:07.203518 IP (tos 0x0, ttl 128, id 22265, offset 0, flags [none], proto: UDP (17), length: 138) 172.16.252.2.53 > 172.16.251.61.32778: [udp sum ok] 2048 NXDomain* q: A? 172.16.252.2,172.16.252.9.ssl.lab. 0/1/0 ns: ssl.lab. SOA
    appliance.ssl.lab. hostmaster.ssl.lab. 492 900 600 86400 3600 (110)


    Resolution or Workaround:

    The above query is invalid and SonicWall has investigated this symptom. SonicWall will address this issue on the upcoming firmware releases 10.0.5 & 10.5.2


    How to Test:

    a. Setup Primary & Secondary WINS Server on the Appliance
    b. Make any change in the AMC (Ex AUTH Server - Cache lifetime value, applied
    pending change)
    c. Perform a capture to see the DNS query sent from the appliance.


    Tracking ID: 91037

    Related Articles

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    • SMA1000:When both IPv4 and IPv6 are enabled for the network interface, the first few connection attempts fail, but everything works fine after that.

    Categories

    • Secure Mobile Access > SMA 1000 Series

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