[FS#27] BT Home Hub 5 Type A - Switch problem when enabling WAN port - Comment added

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The following task has a new comment added:

FS#27 - BT Home Hub 5 Type A - Switch problem when enabling WAN port
User who did this - Bill L. (bill888)

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I'm afraid forcing PC to release and re-acquire DHCP IP address does not resolve issue.

I have also configured a static IP address and DNS setting on client PC.  Here are ping results shortly after the Hub has been switched on:


C:\Users\admin>ping 8.8.8.8 -t

Pinging 8.8.8.8 with 32 bytes of data:
Reply from 8.8.8.8: bytes=32 time=8ms TTL=53
Reply from 8.8.8.8: bytes=32 time=9ms TTL=53
Reply from 8.8.8.8: bytes=32 time=8ms TTL=53
Reply from 8.8.8.8: bytes=32 time=8ms TTL=53
Reply from 8.8.8.8: bytes=32 time=8ms TTL=53
Reply from 8.8.8.8: bytes=32 time=8ms TTL=53
Reply from 8.8.8.8: bytes=32 time=8ms TTL=53
Reply from 8.8.8.8: bytes=32 time=8ms TTL=53
Reply from 8.8.8.8: bytes=32 time=8ms TTL=53
Reply from 8.8.8.8: bytes=32 time=3616ms TTL=53
Reply from 8.8.8.8: bytes=32 time=1517ms TTL=53
Reply from 8.8.8.8: bytes=32 time=641ms TTL=53
Request timed out.
Reply from 8.8.8.8: bytes=32 time=1114ms TTL=53

Ping statistics for 8.8.8.8:
    Packets: Sent = 14, Received = 13, Lost = 1 (7% loss),
Approximate round trip times in milli-seconds:
    Minimum = 8ms, Maximum = 3616ms, Average = 535ms
Control-C
^C
C:\Users\admin>ping 8.8.8.8 -t

Pinging 8.8.8.8 with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.


When the above pings fail from client PC connected to LAN port of Hub, I am still seeing these 'eth0: tx ring full' messages on serial console:

[   95.372341] eth1: transmit timed out, disable the dma channel irq
[   95.381099] eth1: tx ring full
[   95.381134] eth0: tx ring full
[  105.953032] eth1: transmit timed out, disable the dma channel irq
[  105.957949] eth1: tx ring full
[  124.961063] eth0: transmit timed out, disable the dma channel irq
[  124.965868] eth0: tx ring full
[  162.758301] eth0: tx ring full
[  162.823880] eth1: tx ring full
[  164.023015] eth1: tx ring full
[  166.845388] eth0: port 4 lost link
[  166.849247] br-lan: port 1(eth0.1) entered disabled state
[  169.845683] eth1: port 5 lost link


As another test, I have just installed r48886 image from OpenWRT BT Home Hub 5 Type A wiki to a second Hub.  Using the same  network configuration file changes, internet through WAN port (DHCP client mode) works perfectly.







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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=27#comment60