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2.4ghz connectivity and arp issues

Discussion in 'ASUSWRT - Official' started by agilani, Jun 11, 2018 at 11:39 PM.

  1. agilani

    agilani Regular Contributor

    Joined:
    Nov 30, 2012
    Messages:
    164
    Hi,
    I've been trying to troubleshoot the problems many of us have been experiencing with wireless connectivity on the new 384 code base. I've been doing packet caputres and looking through logs to try and find a common thread for why/when the problem occurs on my ac88. Here is something interesting i found.

    I started doing a network capture while i was experiencing problems with throughput and latency on the 2.4ghz. Wired and 5ghz appeared to be working fine.

    A few observations from the packet caputre...

    High latency just pinging the router interface on 2.4 ghz with only 2 hosts connected
    lots of tcp spurios retransmissions, dup ack and resets
    no ssdp traffic which is very common normally
    lots of duplicate and repeated dhcprequest and dhcpack over and over in the logs and no dhcp in the traffic
    and lots of issues with arp
    Code:
    10    4.190196    AsustekC_21:17:f0    IntelCor_29:dc:95    ARP    42    Who has 192.168.1.126? Tell 192.168.1.1
    12    4.190232    IntelCor_29:dc:95    AsustekC_21:17:f0    ARP    42    192.168.1.126 is at 14:ab:c5:29:dc:95
    27    12.085077    IntelCor_29:dc:95    AsustekC_21:17:f0    ARP    42    Who has 192.168.1.1? Tell 192.168.1.126
    28    12.150206    AsustekC_21:17:f0    IntelCor_29:dc:95    ARP    42    192.168.1.1 is at 2c:4d:54:21:17:f0
    90    39.798098    AsustekC_21:17:f0    IntelCor_29:dc:95    ARP    42    Who has 192.168.1.126? Tell 192.168.1.1
    92    39.798142    IntelCor_29:dc:95    AsustekC_21:17:f0    ARP    42    192.168.1.126 is at 14:ab:c5:29:dc:95
    93    40.584450    IntelCor_29:dc:95    AsustekC_21:17:f0    ARP    42    Who has 192.168.1.1? Tell 192.168.1.126
    95    41.573567    IntelCor_29:dc:95    AsustekC_21:17:f0    ARP    42    Who has 192.168.1.1? Tell 192.168.1.126
    96    42.583403    IntelCor_29:dc:95    AsustekC_21:17:f0    ARP    42    Who has 192.168.1.1? Tell 192.168.1.126
    97    45.598593    IntelCor_29:dc:95    Broadcast    ARP    42    Who has 192.168.1.1? Tell 192.168.1.126
    98    46.582523    IntelCor_29:dc:95    Broadcast    ARP    42    Who has 192.168.1.1? Tell 192.168.1.126
    99    47.572151    IntelCor_29:dc:95    Broadcast    ARP    42    Who has 192.168.1.1? Tell 192.168.1.126
    100    48.581563    IntelCor_29:dc:95    Broadcast    ARP    42    Who has 192.168.1.1? Tell 192.168.1.126
    101    49.576399    IntelCor_29:dc:95    Broadcast    ARP    42    Who has 192.168.1.1? Tell 192.168.1.126
    102    50.581669    IntelCor_29:dc:95    Broadcast    ARP    42    Who has 192.168.1.1? Tell 192.168.1.126
    103    51.585371    IntelCor_29:dc:95    Broadcast    ARP    42    Who has 192.168.1.1? Tell 192.168.1.126
    104    52.582358    IntelCor_29:dc:95    Broadcast    ARP    42    Who has 192.168.1.1? Tell 192.168.1.126
    105    53.582136    IntelCor_29:dc:95    Broadcast    ARP    42    Who has 192.168.1.1? Tell 192.168.1.126
    106    54.577736    IntelCor_29:dc:95    Broadcast    ARP    42    Who has 192.168.1.1? Tell 192.168.1.126
    107    55.574946    IntelCor_29:dc:95    Broadcast    ARP    42    Who has 192.168.1.1? Tell 192.168.1.126
    108    56.584652    IntelCor_29:dc:95    Broadcast    ARP    42    Who has 192.168.1.1? Tell 192.168.1.126
    109    57.590226    IntelCor_29:dc:95    Broadcast    ARP    42    Who has 192.168.1.1? Tell 192.168.1.126
    and when checking the arp table on the router - lots of arp incomplete

    this all the while there is continuous ping running between the workstation and router.


    basically all of the symptoms of a layer 2 meltdown anyone else looking into this? I've tried to open up a case with asus to see if i can track this down.
     
    Grisu likes this.
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  3. agilani

    agilani Regular Contributor

    Joined:
    Nov 30, 2012
    Messages:
    164

    So far here is the generic response from the knuckleheads @ asus

    change channel bandwidth to 40 - mine was set to 20/40 - made no difference
    Disable QOS - was already disabled
    Disable AiProtection - Really?
    Control channel auto - was already set to auto

    Additional steps to try if the Wi-Fi problem still persists.
    a. Make sure the settings like QoS or AiProtection are DISABLED, only have the regular Wi-Fi/internet setting.
    b. Reboot/restart the router 3 times, (use the power on/off button on the router, allow the router to finish the booting process before restarting it again, it may take about 3 – 5 minutes) in order to get the router’s memory/cache completely cleared/refreshed.


    In the event that you have additional concerns, please let me know and I will be happy to take care of them as well. Thank you for choosing ASUS. Your case number is: N180665774.
     
  4. Treadler

    Treadler Regular Contributor

    Joined:
    Nov 9, 2017
    Messages:
    124
    Location:
    South Australia


    My 10 cents worth,

    My 2.4 rock solid here.
    [Edit] Standard router mode.

    2.4 settings:
    Channel width manually set to 20 MHz.
    [Edit] Channel selection - auto.
    Mu-MIMO disable.
    Universal Beamforming disable.
    Airtime fairness disable.
    Roaming assistant disable.
    Reduce USB 3 interference disable.

    All these have been recommended at one time or another in this forum.
    Might be worth trying?
     
  5. agilani

    agilani Regular Contributor

    Joined:
    Nov 30, 2012
    Messages:
    164
    I have most of these with the exceptinof reduce usb 3 interference....hmm, i did plug in the USB card into the front usb 3 slot, but it's a usb 2 card. Will give hat a shot and see what happens. I also just added reduce bluetooth interference as well.

    Hmm, just checked the ac88 doesn't seem to have the usb interference setting.

    thanks for your feedback!
     
    Last edited: Jun 13, 2018 at 2:55 AM
  6. Grisu

    Grisu Senior Member

    Joined:
    Aug 28, 2014
    Messages:
    356
    they changed it to USB3.0 button on start page, only available if a USB3.0 device is connected.
     
  7. agilani

    agilani Regular Contributor

    Joined:
    Nov 30, 2012
    Messages:
    164
    ok, that explains it. My usb device is a usb 2.0 device.
     
  8. bbunge

    bbunge Senior Member

    Joined:
    Aug 11, 2014
    Messages:
    464
    My RT-AC66U B1 started to loose the 2.4 band today. Watching Acrylic WIFI analyzer the 2.4 band blinks on and off. Did a factory reset reloaded latest firmware. No improvement. Tried several of the Professional changes with no luck. May go back to a prior firmware or haul out the WRT1900AC!

    Sent from my P01M using Tapatalk
     
  9. mlippold

    mlippold Occasional Visitor

    Joined:
    Jan 13, 2016
    Messages:
    46
    My RT-AC5300 with 3.0.0.4.384_21045 is definitely seeing some strange 2.4Ghz issues as well. I have Roaming Assist, Universal Beam forwarding, Enable WMM APSD, Multi-User MIMO and Airtime Fairness all turned off and nothing seems to help.
     
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