#21798: Wifi TCP stops working when LAN cable is unplugged
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Reporter: KakuRoze | Owner: developers
Type: defect | Status: new
Priority: normal | Milestone:
Component: base system | Version: Chaos Calmer 15.05
Keywords: WIfi IP packet loss |
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Hi, when I was trying to set up triggers for enabling/disabling wifi, I
ran into a quite unusual problem.
'''Setup:'''
Device: HLK-RM04
OpenWRT: Chaos Clamer/Bleeding Edge/r43860
2x PHY; LAN(eth0.1) and WAN(eth0.2=192.168.0.x[IP:LAN]) - both used as LAN
ports
1x Wifi (wlan=192.168.0.y[IP:WLAN]/wifi-iface)
'''Problem:'''
When booting the device with Wifi enabled (sta mode/static) and a network
cable plugged into the "WAN" jack and later unplugging this cable, causes
the device to stop accepting IP packets.
'''Tested:'''
'''*''' Ping/connect to device [>IP:WLAN] before unplug: Ping '''*'''
Reply OK (ca 1 ms)
'''*''' Unplug cable from WAN jack
'''*''' Ping/connect to device [>IP:WLAN] after unplug: Ping timeout
'''*''' Remove arp-entry for IP:WLAN on the computer doing the ping. (arp
-d IP:WLAN on windows)
'''*''' Confirm arp-entry removed: Yes
'''*''' Ping/connect to device [>IP:WLAN] after removal of arp: Ping
Timeout
'''*''' Arp entry re-appeard (arp -a on windows), device/network clearly
responds to ARP.
'''*''' Reconnect cable to WAN jack
'''*''' Ping/connect to device [>IP:WLAN] after replugging of '''*'''
cable: Ping Reply OK (almost instantly after re-plugging cable)
'''Other info'''
The error does Not manifest if the WAN cable is not present on boot-time,
but added later. IP packets are still received as supposed in this case.
Device still stays associated with Access point after removing the cable
from the device.
--
Ticket URL: <https://dev.openwrt.org/ticket/21798>
OpenWrt <http://openwrt.org>
Opensource Wireless Router Technology
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