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    [SOLVED] Wi-Fi recognizes connects to some networks, but not all

    I just received my new laptop (the old one having died from a swollen battery). The wireless is performing strangely. It recognizes and connects with my guest networks. It recognizes but will not connect with my secured networks. I protect the secured networks with MAC filtering. I have correctly entered the machine's MAC in the wireless security settings. I have double checked to ensure that I have typed the network passwords in correctly.
    One question I do have is whether I have typed in all the necessary MAC addresses. Here is the product of ifconfig:

    enp0s31f6: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
    ether 90:2e:16:57:ad:b5 txqueuelen 1000 (Ethernet)
    RX packets 1087543 bytes 944871674 (944.8 MB)
    RX errors 0 dropped 860 overruns 0 frame 0
    TX packets 523462 bytes 326518712 (326.5 MB)
    TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
    device interrupt 16 memory 0xae500000-ae520000

    lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
    inet 127.0.0.1 netmask 255.0.0.0
    inet6 ::1 prefixlen 128 scopeid 0x10<host>
    loop txqueuelen 1000 (Local Loopback)
    RX packets 11106 bytes 957600 (957.6 KB)
    RX errors 0 dropped 0 overruns 0 frame 0
    TX packets 11106 bytes 957600 (957.6 KB)
    TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

    vmnet1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
    inet 192.168.66.1 netmask 255.255.255.0 broadcast 192.168.66.255
    inet6 fe80::250:56ff:fec0:1 prefixlen 64 scopeid 0x20<link>
    ether 00:50:56:c0:00:01 txqueuelen 1000 (Ethernet)
    RX packets 0 bytes 0 (0.0 B)
    RX errors 0 dropped 0 overruns 0 frame 0
    TX packets 108 bytes 0 (0.0 B)
    TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

    vmnet8: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
    inet 192.168.199.1 netmask 255.255.255.0 broadcast 192.168.199.255
    inet6 fe80::250:56ff:fec0:8 prefixlen 64 scopeid 0x20<link>
    ether 00:50:56:c0:00:08 txqueuelen 1000 (Ethernet)
    RX packets 751 bytes 0 (0.0 B)
    RX errors 0 dropped 0 overruns 0 frame 0
    TX packets 109 bytes 0 (0.0 B)
    TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

    wlp9s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
    inet 192.168.102.50 netmask 255.255.255.0 broadcast 192.168.102.255
    inet6 fe80::848a:337a:18c3:737 prefixlen 64 scopeid 0x20<link>
    ether 94:e6:f7:4f:cb:7b txqueuelen 1000 (Ethernet)
    RX packets 9297 bytes 2530677 (2.5 MB)
    RX errors 0 dropped 0 overruns 0 frame 0
    TX packets 11933 bytes 2032796 (2.0 MB)
    TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

    Does anyone have an idea of what's going on? The machine clearly recognizes my wireless card; else I could not get on the guest networks.

    Thanks in advance.
    Last edited by Don; Jan 29, 2022, 03:49 PM.

    #2
    When you right-click on the WiFi Radar icon in the System Tray and select Configure Network Connections... and click on the secured network under Wi-Fi, what Security do you have set in the Wi-Fi Security tab?
    Using Kubuntu Linux since March 23, 2007
    "It is a capital mistake to theorize before one has data." - Sherlock Holmes

    Comment


      #3
      Thanks for the fast reply, Snowhog.

      Security: WPA/WPA2 Personal
      Password: *********************
      Store password for this user only (encrypted)

      Comment


        #4
        This is an old article, but it asks and answers the question of whether MAC Address Filtering is effective. Security Through Obscurity: MAC Address Filtering ( Layer 2 Filtering )

        Do you really need to use it?
        Using Kubuntu Linux since March 23, 2007
        "It is a capital mistake to theorize before one has data." - Sherlock Holmes

        Comment


          #5
          Does the laptop also have Ethernet? if so, could you be using that device's (enp0s31f6) MAC as opposed to the WiFi (enp0s31f6) MAC?

          Comment


            #6
            I used MAC to tell the DHCP what IP address I want the device to have. My IPv6 tunnel is tied to my Wi-Fi address and I can't have the Wi-Fi just assigning any address willy-nilly. I want my laptop to be 192.168.11.100, so I bind that address to my MAC, knowing that I will get that same IP address every time I boot this machine.

            I currently plug my laser printer directly into my laptop. I used to have it connected to the local lan so that my wife could print something too.
            To avoid having an IP address assigned first come/first serve, and having to reconfigure the laser every time, I set the DHCP to despense 10 addesses, starting with *.*.*.100 and ending with *.110. Then, I'd use the MAC address to tell the Wi-Fi that I wanted the printer to have the *.99 address, which no one else could be assigned. That way, it didn't matter in what order anyone, or any phone, logged onto the Wi-Fi. The printer always had, *.99, I always have *.100 and everything else between 101 and 110 was assigned first come first serve.
            "A nation that is afraid to let its people judge the truth and falsehood in an open market is a nation that is afraid of its people.”
            – John F. Kennedy, February 26, 1962.

            Comment


              #7
              Finally got it solved, but it seems odd to me. The last listed "ethernet" address in my original post turns out to be the MAC address of the wireless NIC. I was confused because I'm used to seeing either "MAC address" or "Physical address" to indicate that. It seems the "ethernet" listing reflects a change in Kubuntu. Thanks to all who tried to help. And Snowhog, I take your point about the effectiveness of MAC filtering, but I live way out in the boonies, and I'm very old, and using it makes me feel better. The great thing about placebos is that they have not side effects.

              Comment


                #8
                Originally posted by Don View Post
                And Snowhog, I take your point about the effectiveness of MAC filtering, but I live way out in the boonies, and I'm very old, and using it makes me feel better. The great thing about placebos is that they have not side effects.
                Completely understand! I'm not so young either!
                Using Kubuntu Linux since March 23, 2007
                "It is a capital mistake to theorize before one has data." - Sherlock Holmes

                Comment

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