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Old 07-12-2020, 04:04 PM   #1
Ignotum Per Ignotius
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Trouble Pinging Wireless Access Point (iMac 5,1; BCM4321; wl.ko)


Hi.

My problem is fairly straightforward to describe, but I'm stumped.

I'm trying to install Arch (using June's ISO) on an old iMac 5,1 and I've got the ISO to boot from USB (after a lot of difficulty owing to the 32-bit UEFI) but now I've hit an issue with the network card.

The output of lspci shows the card as a BCM4321 (PCI ID [14e4:4328]).

Code:
03:00.0 Network controller [0280]: Broadcom Inc. and subsidiaries BCM4321 802.11a/b/g/n [14e4:4328] (rev 03)
	Subsystem: Apple Inc. AirPort Extreme [106b:0087]
	Physical Slot: 1
	Flags: bus master, fast devsel, latency 0, IRQ 17
	Memory at c8200000 (64-bit, non-prefetchable) [size=16K]
	Memory at c8000000 (64-bit, prefetchable) [size=1M]
	Capabilities: [40] Power Management version 2
	Capabilities: [58] Vendor Specific Information: Len=78 <?>
	Capabilities: [e8] MSI: Enable- Count=1/1 Maskable- 64bit+
	Capabilities: [d0] Express Endpoint, MSI 00
	Capabilities: [100] Advanced Error Reporting
	Capabilities: [13c] Virtual Channel
	Capabilities: [160] Device Serial Number 94-a0-e3-ff-ff-e0-00-19
	Capabilities: [16c] Power Budgeting <?>
	Kernel driver in use: wl
	Kernel modules: ssb, wl
According to the Linux wireless page, this requires the wl driver. Fortunately, the wl module is included as standard with the Arch installation ISO.

The Arch Linux documentation for Broadcom wireless cards says that when using wl, the b43 and ssb modules must be removed first, and that the lib80211 module should also be loaded if wl does not load it automatically.

And so I do the following.

First I remove all the wireless-related modules.

Code:
modprobe -r b43 ssb_hcd ssb wl
(I find I must remove ssb_hcd in order to remove ssb, and also remove wl.)

Then I re-load wl.

Code:
modprobe wl
This brings up the network interface.

I now load the lib80211 module.

Code:
modprobe lib80211
Finally I run Arch's wifi-menu script, which scans for wireless networks, prompts for a passphrase and writes a netctl profile for the connection.

Code:
wifi-menu
I then check the output of iwconfig and ifconfig to verify that I have been given an IP address by the wireless access point.

iwconfig :

Code:
wlan0     IEEE 802.11  ESSID:"MyWifiNetwork"  
          Mode:Managed  Frequency:2.432 GHz  Access Point: E4:A7:C5:49:EA:63   
          Bit Rate=104 Mb/s   Tx-Power=200 dBm   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Encryption key:off
          Power Management:off
          Link Quality=56/70  Signal level=-54 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0

ifconfig :

Code:
wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.0.103  netmask 255.255.255.0  broadcast 192.168.0.255
        ether 00:19:e3:e0:94:a0  txqueuelen 1000  (Ethernet)
        RX packets 9  bytes 1274 (1.2 KiB)
        RX errors 0  dropped 0  overruns 0  frame 5724
        TX packets 28  bytes 3066 (2.9 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 17
...All looks OK.

However...

When I then try to ping the router, very few packets reach their destination, and most are not received.

Code:
PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data.
64 bytes from 192.168.0.1: icmp_seq=5 ttl=64 time=233 ms
From 192.168.0.103 icmp_seq=10 Destination Host Unreachable
From 192.168.0.103 icmp_seq=11 Destination Host Unreachable
From 192.168.0.103 icmp_seq=12 Destination Host Unreachable
64 bytes from 192.168.0.1: icmp_seq=13 ttl=64 time=1249 ms
64 bytes from 192.168.0.1: icmp_seq=22 ttl=64 time=217 ms
64 bytes from 192.168.0.1: icmp_seq=23 ttl=64 time=15.5 ms
^C
--- 192.168.0.1 ping statistics ---
24 packets transmitted, 4 received, +3 errors, 83.3333% packet loss, time 23264ms
rtt min/avg/max/mdev = 15.539/428.600/1248.892/481.288 ms, pipe 4
Anyone have any ideas?

Thanks...

Last edited by Ignotum Per Ignotius; 07-12-2020 at 04:07 PM.
 
Old 07-21-2020, 09:47 AM   #2
smallpond
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Did you add the default route? What's the output of "ip route show" ?
 
Old 07-22-2020, 06:31 AM   #3
Ignotum Per Ignotius
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Hi @smallpond.

Thanks for your reply.

Quote:
Did you add the default route?
I think that the wifi-menu utility takes care of that automatically when it connects to the wireless access point.

Quote:
What's the output of "ip route show" ?
Code:
default via 192.168.0.1 dev wlan0 proto dhcp src 192.168.0.103 metric 304 
192.168.0.0/24 dev wlan0 proto dhcp scope link src 192.168.0.103 metric 304
When I try pinging the iMac from my laptop, maybe one packet in a hundred is received.

Code:
$ ping 192.168.0.103
PING 192.168.0.103 (192.168.0.103) 56(84) bytes of data.
64 bytes from 192.168.0.103: icmp_seq=37 ttl=64 time=218 ms
^C
--- 192.168.0.103 ping statistics ---
100 packets transmitted, 1 received, 99% packet loss, time 100316ms
rtt min/avg/max/mdev = 217.970/217.970/217.970/0.000 ms
Strange stuff...
 
Old 07-22-2020, 09:40 AM   #4
smallpond
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Can you ping something else, like 8.8.8.8?
 
Old 07-22-2020, 04:33 PM   #5
Ignotum Per Ignotius
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Quote:
Originally Posted by smallpond View Post
Can you ping something else, like 8.8.8.8?
It's the same story: it tries but nothing comes back apart from "Destination Host Unreachable" messages now and then.

The only IP I can ping reliably is the IP assigned to the iMac itself.
 
Old 07-24-2020, 10:09 AM   #6
smallpond
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Check logs for errors or bad behavior. This article lists a number of possible issues;

https://www.archybold.com/blog/post/...networkmanager
 
  


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