When i use tcp_probe module to collect cwnd for a TCP connection, the cwnd will stop to increase by around 1467(packets). Can anyone explain the reason for this ? or what is limiting the cwnd on earth ?
The TCP connection is a download a 2G file from host1 (192.168.0.2) to host2 (192.168.0.25), here is my commands for this connection.
#host1: python -m SimpleHTTPServer
#host2: wget http://192.168.0.2:8000/test_2G
Here is the command for using tcp_probe to collect the cwnd:
#host1: modprobe tcp_probe port=800 full=1
Here are some other info you may want to know:
#host1:
#ifconfig eth4
eth4 Link encap:Ethernet HWaddr 90:E2:BA:14:BE:AC
inet addr:192.168.0.2 Bcast:192.255.255.255 Mask:255.0.0.0
inet6 addr: fe80::92e2:baff:fe14:beac/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:15263651 errors:0 dropped:0 overruns:0 frame:0
TX packets:31145880 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:5000
RX bytes:1008133254 (961.4 MiB) TX bytes:47154490579 (43.9 GiB)
Memory:fb780000-fb800000
#cat /proc/sys/net/ipv4/tcp_mem
770373 1027165 1540746
#cat /proc/sys/net/core/rmem_default
212992
#cat /proc/sys/net/core/rmem_max
12582912
#cat /proc/sys/net/core/wmem_default
425984
#cat /proc/sys/net/core/wmem_max
12582912
#cat /proc/sys/net/ipv4/tcp_wmem
10240 87380 12582912
#cat /proc/sys/net/ipv4/tcp_rmem
10240 87380 12582912
After digged in the kernel code, i find out the CWND wouldn't invoke the increase function if the tcp is limited by application instead of network capacity.
All the magic is caused by the function tcp_is_cwnd_limited in the file tcp_cong.c. Every congestion algorithm will return directly if tcp is NOT limited by cwnd. :)
Related
I have a Cisco ASA 5506-X running version 9.9(2). I recently upgraded my internet to gigabit speeds (in reality about 750 - 850 Mbps). However, my ASA was only allowing throughput of about 200Mbps. I thought that the ASA would allow throughput up to 750Mbps.
Troubleshooting steps:
Reset ASA and setup basic config.
Tested internet speed and received somewhere near 200Mbps.
Disabled FirePower service and tested speed again to get near 300Mbps
Connected PC directly to cable modem and was able to get speeds of 800Mbps - 850Mbps (three attempts).
Re-connected ASA and still get only 300Mbps (maybe 310).
Can you help me figure out why I'm not getting better throughput?
Show Version:
Cisco Adaptive Security Appliance Software Version 9.9(2)36
Firepower Extensible Operating System Version 2.3(1.122)
Device Manager Version 7.16(1)150
Compiled on Wed 12-Dec-18 16:53 PST by builders
System image file is "disk0:/asa992-36-lfbff-k8.SPA"
Config file at boot was "startup-config"
ciscoasa up 16 secs
Hardware: ASA5506, 4096 MB RAM, CPU Atom C2000 series 1250 MHz, 1 CPU (4 cores)
Internal ATA Compact Flash, 8000MB
BIOS Flash M25P64 # 0xfed01000, 16384KB
Encryption hardware device : Cisco ASA Crypto on-board accelerator (revision 0x1)
Number of accelerators: 1
1: Ext: GigabitEthernet1/1 : address is b0c5.3cfa.25d8, irq 255
2: Ext: GigabitEthernet1/2 : address is b0c5.3cfa.25d9, irq 255
3: Ext: GigabitEthernet1/3 : address is b0c5.3cfa.25da, irq 255
4: Ext: GigabitEthernet1/4 : address is b0c5.3cfa.25db, irq 255
5: Ext: GigabitEthernet1/5 : address is b0c5.3cfa.25dc, irq 255
6: Ext: GigabitEthernet1/6 : address is b0c5.3cfa.25dd, irq 255
7: Ext: GigabitEthernet1/7 : address is b0c5.3cfa.25de, irq 255
8: Ext: GigabitEthernet1/8 : address is b0c5.3cfa.25df, irq 255
9: Int: Internal-Data1/1 : address is b0c5.3cfa.25d7, irq 255
10: Int: Internal-Data1/2 : address is 0000.0001.0002, irq 0
11: Int: Internal-Control1/1 : address is 0000.0001.0001, irq 0
12: Int: Internal-Data1/3 : address is 0000.0001.0003, irq 0
13: Ext: Management1/1 : address is b0c5.3cfa.25d7, irq 0
14: Int: Internal-Data1/4 : address is 0000.0100.0001, irq 0
Licensed features for this platform:
Maximum Physical Interfaces : Unlimited perpetual
Maximum VLANs : 30 perpetual
Inside Hosts : Unlimited perpetual
Failover : Active/Standby perpetual
Encryption-DES : Enabled perpetual
Encryption-3DES-AES : Enabled perpetual
Carrier : Disabled perpetual
AnyConnect Premium Peers : 4 perpetual
AnyConnect Essentials : Disabled perpetual
Other VPN Peers : 50 perpetual
Total VPN Peers : 50 perpetual
AnyConnect for Mobile : Disabled perpetual
AnyConnect for Cisco VPN Phone : Disabled perpetual
Advanced Endpoint Assessment : Disabled perpetual
Shared License : Disabled perpetual
Total TLS Proxy Sessions : 160 perpetual
Botnet Traffic Filter : Disabled perpetual
Cluster : Disabled perpetual
This platform has an ASA 5506 Security Plus license.
Serial Number: JXXXXXXXXXX
Running Permanent Activation Key: 0x1A1A1A1A 0x2B2B2B2B 0x3C3C3C3C 0x4D4D4D4D 0x5E5E5E5E
Configuration register is 0x1
Image type : Release
Key Version : A
Configuration has not been modified since last system restart.
Config
ASA Version 9.9(2)36
!
hostname ciscoasa
enable password xxxxxxxxxxxxxxxxxxxxxxx pbkdf2
passwd xxxxxxxxxxxx. encrypted
names
!
interface GigabitEthernet1/1
nameif outside
security-level 0
ip address dhcp setroute
!
interface GigabitEthernet1/2
nameif inside
security-level 100
ip address 172.16.254.1 255.255.255.0
!
interface GigabitEthernet1/3
shutdown
no nameif
no security-level
no ip address
!
interface GigabitEthernet1/4
shutdown
no nameif
no security-level
no ip address
!
interface GigabitEthernet1/5
shutdown
no nameif
no security-level
no ip address
!
interface GigabitEthernet1/6
shutdown
no nameif
no security-level
no ip address
!
interface GigabitEthernet1/7
shutdown
no nameif
no security-level
no ip address
!
interface GigabitEthernet1/8
shutdown
no nameif
no security-level
no ip address
!
interface Management1/1
management-only
shutdown
no nameif
no security-level
no ip address
!
ftp mode passive
access-list INBOUND extended permit icmp any any echo-reply
pager lines 24
mtu outside 1500
mtu inside 1500
no failover
no monitor-interface service-module
icmp unreachable rate-limit 1 burst-size 1
no asdm history enable
arp timeout 14400
no arp permit-nonconnected
arp rate-limit 16384
!
nat (inside,outside) after-auto source dynamic any interface
access-group INBOUND in interface outside
timeout xlate 3:00:00
timeout pat-xlate 0:00:30
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 sctp 0:02:00 icmp 0:00:02
timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00
timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00
timeout sip-provisional-media 0:02:00 uauth 0:05:00 absolute
timeout tcp-proxy-reassembly 0:01:00
timeout floating-conn 0:00:00
timeout conn-holddown 0:00:15
timeout igp stale-route 0:01:10
user-identity default-domain LOCAL
aaa authentication ssh console LOCAL
aaa authentication login-history
no snmp-server location
no snmp-server contact
service sw-reset-button
crypto ipsec security-association pmtu-aging infinite
crypto ca trustpool policy
telnet timeout 5
ssh stricthostkeycheck
ssh 172.16.254.0 255.255.255.0 inside
ssh timeout 30
ssh version 2
ssh key-exchange group dh-group1-sha1
console timeout 0
dhcpd dns <my ISP DNS server 1> <my ISP DNS server 2>
dhcpd option 3 ip 172.16.254.1
!
dhcpd address 172.16.254.33-172.16.254.221 inside
dhcpd enable inside
!
threat-detection basic-threat
threat-detection statistics access-list
no threat-detection statistics tcp-intercept
dynamic-access-policy-record DfltAccessPolicy
username myuser password xxxxxxxxxxxx pbkdf2
!
class-map inspection_default
match default-inspection-traffic
!
!
policy-map type inspect dns preset_dns_map
parameters
message-length maximum client auto
message-length maximum 512
no tcp-inspection
policy-map global_policy
class inspection_default
inspect ftp
inspect h323 h225
inspect h323 ras
inspect ip-options
inspect netbios
inspect rsh
inspect rtsp
inspect skinny
inspect esmtp
inspect sqlnet
inspect sunrpc
inspect tftp
inspect sip
inspect xdmcp
inspect dns preset_dns_map
policy-map type inspect dns migrated_dns_map_2
parameters
message-length maximum client auto
message-length maximum 512
no tcp-inspection
policy-map type inspect dns migrated_dns_map_1
parameters
message-length maximum client auto
message-length maximum 512
no tcp-inspection
!
service-policy global_policy global
prompt hostname context
no call-home reporting anonymous
call-home
profile CiscoTAC-1
no active
destination address http https://tools.cisco.com/its/service/oddce/services/DDCEService
destination address email callhome#cisco.com
destination transport-method http
subscribe-to-alert-group diagnostic
subscribe-to-alert-group environment
subscribe-to-alert-group inventory periodic monthly
subscribe-to-alert-group configuration periodic monthly
subscribe-to-alert-group telemetry periodic daily
Cryptochecksum:7bf6464dd03896f00321926e98426397
what is the CPU usage ?
also post here show interface gi1/1
Also try configuring manually on outside duplex full and speed auto or speed 1000
but before doing that post the stats of the outside interface first
I am trying to emulate a firmware image using qemu. During booting, I get the following error
can't run '/etc/init.d/rcS': No such file or directory
can't open /dev/ttyS0: No such file or directory
can't open /dev/ttyS0: No such file or directory
can't open /dev/ttyS0: No such file or directory
.
.
.
This is the content of the inittab file
# Startup the system
null::sysinit:/etc/init.d/rc.sysinit
# now run any rc scripts
::sysinit:/etc/init.d/rcS
# Put a getty on the serial port
ttyS0::respawn:/sbin/getty -L ttyS0 115200 vt100
# Stuff to do before rebooting
null::shutdown:/bin/umount -a -r
It is able to run the rc.sysinit, but not the rcS.
I have checked permissions of the rcS. Also, the filesystem is mounted as read-only cramfs. Could this be causing an issue?
This is the command I am running:
QEMU_AUDIO_DRV=none \qemu-system-arm -m 256M -M versatilepb
-kernel ~/linux-2.6.23/arch/arm/boot/zImage
-append "console=ttyAMA0,115200 root=/dev/ram rdinit=/sbin/init"
-initrd ~/tmpcramfs2
-nographic
These are the boot messages obtained on running the command:
Linux version 2.6.23 (hsailer#SvanteArrhenius) (gcc version 4.0.2) #1 Thu May 27 09:31:10 EDT 2021
CPU: ARM926EJ-S [41069265] revision 5 (ARMv5TEJ), cr=00093177
Machine: ARM-Versatile PB
Memory policy: ECC disabled, Data cache writeback
CPU0: D VIVT write-through cache
CPU0: I cache: 4096 bytes, associativity 4, 32 byte lines, 32 sets
CPU0: D cache: 65536 bytes, associativity 4, 32 byte lines, 512 sets
Built 1 zonelists in Zone order. Total pages: 65024
Kernel command line: console=ttyAMA0,115200 root=/dev/ram rdinit=/sbin/init
PID hash table entries: 1024 (order: 10, 4096 bytes)
Console: colour dummy device 80x30
Dentry cache hash table entries: 32768 (order: 5, 131072 bytes)
Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)
Memory: 256MB = 256MB total
Memory: 249600KB available (2508K code, 227K data, 100K init)
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
NET: Registered protocol family 16
NET: Registered protocol family 2
Time: timer3 clocksource has been installed.
IP route cache hash table entries: 2048 (order: 1, 8192 bytes)
TCP established hash table entries: 8192 (order: 4, 65536 bytes)
TCP bind hash table entries: 8192 (order: 3, 32768 bytes)
TCP: Hash tables configured (established 8192 bind 8192)
TCP reno registered
checking if image is initramfs...it isn't (bad gzip magic numbers); looks like an initrd
Freeing initrd memory: 7184K
NetWinder Floating Point Emulator V0.97 (double precision)
Installing knfsd (copyright (C) 1996 okir#monad.swb.de).
JFFS2 version 2.2. (NAND) © 2001-2006 Red Hat, Inc.
JFS: nTxBlock = 2007, nTxLock = 16063
io scheduler noop registered
io scheduler anticipatory registered (default)
io scheduler deadline registered
io scheduler cfq registered
CLCD: Versatile hardware, VGA display
Clock CLCDCLK: setting VCO reg params: S=1 R=99 V=98
Console: switching to colour frame buffer device 80x60
Serial: AMBA PL011 UART driver
dev:f1: ttyAMA0 at MMIO 0x101f1000 (irq = 12) is a AMBA/PL011
console [ttyAMA0] enabled
dev:f2: ttyAMA1 at MMIO 0x101f2000 (irq = 13) is a AMBA/PL011
dev:f3: ttyAMA2 at MMIO 0x101f3000 (irq = 14) is a AMBA/PL011
fpga:09: ttyAMA3 at MMIO 0x10009000 (irq = 38) is a AMBA/PL011
RAMDISK driver initialized: 16 RAM disks of 8192K size 1024 blocksize
smc91x.c: v1.1, sep 22 2004 by Nicolas Pitre <nico#cam.org>
eth0: SMC91C11xFD (rev 1) at d098e000 IRQ 25 [nowait]
eth0: Ethernet addr: 52:54:00:12:34:56
armflash.0: Found 1 x32 devices at 0x0 in 32-bit bank
Intel/Sharp Extended Query Table at 0x0031
Using buffer write method
RedBoot partition parsing not available
afs partition parsing not available
armflash: probe of armflash.0 failed with error -22
mice: PS/2 mouse device common for all mice
input: AT Raw Set 2 keyboard as /class/input/input0
TCP cubic registered
NET: Registered protocol family 1
NET: Registered protocol family 17
VFP support v0.3: implementor 41 architecture 1 part 10 variant 9 rev 0
input: ImExPS/2 Generic Explorer Mouse as /class/input/input1
RAMDISK: cramfs filesystem found at block 0
RAMDISK: Loading 7184KiB [1 disk] into ram disk... done.
VFS: Mounted root (cramfs filesystem) readonly.
Freeing init memory: 100K
can't run '/etc/init.d/rcS': No such file or directory
can't open /dev/ttyS0: No such file or directory
can't open /dev/ttyS0: No such file or directory
can't open /dev/ttyS0: No such file or directory
.
.
.
The errors about /dev/ttyS0 are because your inittab is specifying the wrong device name for the serial port for the (emulated) hardware you're running on. Your QEMU command specifies the 'versatilepb' board, whose serial devices are PL011s, which appear in /dev/ as /dev/ttyAMA0, /dev/ttyAMA1, etc. (/dev/ttyS0 is what the serial ports on an x86 PC appear as.) You need to fix that line of the inittab to refer to ttyAMA0 instead.
For the rcS error, I would suggest you start by double-checking all the things listed in all the responses to this older question.
I cannot reliably trigger this, although if I spin up many vms at a time and then attempt to connect to some of them, I run into this condition:
$ ping 192.168.122.135
PING 192.168.122.135 (192.168.122.135) 56(84) bytes of data.
From 192.168.122.1 icmp_seq=1 Destination Host Unreachable
From 192.168.122.1 icmp_seq=2 Destination Host Unreachable
From 192.168.122.1 icmp_seq=3 Destination Host Unreachable
Note that this does not happen for all VMs that I create and start, only a handful of them (randomly).
The vm that has obtained the ip 192.168.122.135 has the following for its network in its domain xml:
<interface type='network'>
<mac address='52:54:00:3d:72:ab'/>
<source network='default'/>
<target dev='vnet0'/>
<model type='virtio'/>
<alias name='net0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
</interface>
And the default network is defined as (and yes, 22 vms are currently running):
<network connections='22'>
<name>default</name>
<uuid>69674b8b-f067-4513-b594-3e52360f391b</uuid>
<forward mode='nat'>
<nat>
<port start='1024' end='65535'/>
</nat>
</forward>
<bridge name='virbr0' stp='on' delay='0'/>
<ip address='192.168.122.1' netmask='255.255.255.0'>
<dhcp>
<range start='192.168.122.2' end='192.168.122.254'/>
</dhcp>
</ip>
</network>
The output from ifconfig for vnet0 (referenced by the VM's network domain xml) and virbr0 (used by the default network as shown above):
$ sudo ifconfig vnet0
vnet0 Link encap:Ethernet HWaddr fe:54:00:3d:72:ab
inet6 addr: fe80::fc54:ff:fe3d:72ab/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:425 errors:0 dropped:0 overruns:0 frame:0
TX packets:1304 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:500
RX bytes:57503 (57.5 KB) TX bytes:67257 (67.2 KB)
and
$ sudo ifconfig virbr0
virbr0 Link encap:Ethernet HWaddr fe:54:00:08:e9:a4
inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:882508 errors:0 dropped:0 overruns:0 frame:0
TX packets:2527165 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:93980992 (93.9 MB) TX bytes:3047773583 (3.0 GB)
Below is the partial output from ip route list:
192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1
The route output above makes me think that it should be working. BUT ITS NOT. and it only fails sometimes, and works most of the time.
Why can't I connect to the guest (192.168.122.135) from the host??
I was originally using filters, but removing the filters from the VM's domain xml has no effect on this condition randomly showing up. If I spin up many VMs at the same time I can get it to happen to a lot of them. Some of the VMs work just fine though and allow me to connect.
Also, I am using ubuntu 14.04.3:
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.3 LTS
Release: 14.04
Codename: trusty
With kernel 3.19.0-30-generic.
More info - virsh version:
$ virsh --version
1.2.2
libvirtd version:
$ libvirtd --version
libvirtd (libvirt) 1.2.2
I don't have enough reputation to comment... But I have a few suggestions on things you could try to further explore the problem.
Question: Does assigning an IP address in the 192.168.122.X subnet on vnet0 do anything? The route that is configured seems to suggest that your traffic will go to virbr0 since it has the 192.168.122.1 IP address. If you can't ping any other devices in that subnet, then I suspect that's the issue.
If that doesn't get you anywhere...
Packet trace on host / VM
Try doing a packet dump on virbr0 and on the internal VM interface when this occurs. Ping the VM, and see what kind of traffic you see.
sudo tcpdump -n -i virbr0 -v "icmp or arp"
Depending on what you see there, will help narrow down the source of the problem. If you're not even getting your pings on that interface, then it's a routing issue on the host. If pings are going in, but the VM isn't seeing them, then it's a network/routing issue with the libvirt network.
I recommend also doing the above with a working VM, so you have a reference to compare the traffic against.
Check ARP Cache
Check your ARP cache on the host when this occurs. Does the mac address exist in the cache? Maybe it's getting mangled...
To dump the arp cache:
# arp
Check your libvirt logs
If configured, libvirt will log to syslog using the 'libvirtd' tag. Check your configuration to be sure this is enabled. It seems unlikely it's a libvirt issue, but it wouldn't hurt to turn on the logging.
To enable this setting
# vi /etc/libvirt/libvirtd.conf
Add the line
log_outputs_"1:syslog:libvirtd"
Restart libvirt
# service libvirt-bin restart
I had similar issue. I just tried following command to check whether machine is installed properly or not.
lsmod | grep kvm
If it is showing kvm details then machine is installed properly.
After that to restart the services
service libvirtd restart
Also check gateway using the below command
netstat -rn
I have the same network setting, and similar problem in a CentOS 7 host. Eventually, it turned out that the problem was guest VM's firewall setting blocked echo request and other external connection. After changing the firewall setting, the problem is solved.
My case, I've a hardware server where Libvirt is installed.
On this server I create VM in where install libvirt and after that I've get random network interruption and ping response with 192.168.122.1:
From 192.168.122.1 icmp_seq=1 Destination Host Unreachable
I've fixed this be deleting default libvirt network on hardware server like this:
virsh net-destroy default
virsh net-undefine default
I am trying to configure my Linux server to connect via a VPN using the following command:
sudo pppd pty "pptp UKIPVPN.com --nolaunchpppd" file /etc/ppp/options.pptp user ukipvpn.com password freevpn
Using ifconfig I can confirm the pppd connection is established:
ppp0 Link encap:Point-to-Point Protocol
inet addr:10.162.0.74 P-t-P:10.162.0.1 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1496 Metric:1
RX packets:6 errors:0 dropped:0 overruns:0 frame:0
TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:3
RX bytes:60 (60.0 B) TX bytes:66 (66.0 B)
I have added the ppp0 to the route using:
$ sudo route add default ppp0
The issue I have is that the VPN normally serves a HTML 'I accept' page before allowing a connection to the internet.
The page is served every time I try and connect to any pages from the CLI:
curl ipecho.net/plain
<html>
<head><title>UFreeVPN.COM Service from UK</title></head>
<br>
<br>
<font color=blue><center> <h1>UFreeVPN.COM Service from UK</h1> </center></font>
<center><h2><a href='http://uk.ufreevpn.com'>I Agree</a> to use the Free VPN Service</h2></center>
<center><font size='2'>No illegal activities allowed. In case of abuse, users' VPN access log is subjected to expose to related authorities.</font></center>
Is there a way I can 'Agree' from Bash to allow this connection to work?
EDIT:
Having checked the source of the "I agree" page it is just as returned by curl above with no Javascript etc.
On clicking I agree you get auto redirected to http://www.ukipvpn.com.
I tried the following:
curl http://www.ukipvpn.com
and curl http://www.ukipvpn.com -e--referer
but each time i try and grab a page with curl then I am presented with the "I agree" page from the vpn.
So after reading around slightly more on curl the key is to use the POST data function:
curl --data "button=%20I%20AGREE%20&sessionid=<SESSION ID HERE>" http://www.ukipvpn.com
Now the VPN accepts requests and is working. Thanks for the help.
http://curl.haxx.se/docs/httpscripting.html
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I've been installing multiple versions of ubunutu over years and now I better understand why I faced always problems with wifi configuration on these different baselines : Debian root of course.
Issue
Now on Debian 7.4 :
The Broadcom BCM4313 driver is not loaded by default (not free product) for my wifi card. This is stated thru the UNCLAIMED declaration when looking at the network hardware status excerpt :
sudo lshw -c network
*-network UNCLAIMED
description: Network controller
product: BCM4313 802.11b/g/n Wireless LAN Controller
vendor: Broadcom Corporation
physical id: 0
bus info: pci#0000:03:00.0
version: 01
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress cap_list
configuration: latency=0
resources: memory:f1100000-f1103fff
Unclaimed means : no driver found (no kernel association)
So I installed the driver located in the non-free backports by adding this target into the local packages repository /etc/apt/sources.list
deb http://http.debian.net/debian/ wheezy main contrib non-free
and install :
sudo apt-get update && sudo apt-get install firmware-brcm80211
sudo modprobe brcm80211
and restart
sudo shutdown now -r
Check seems OK :
sudo lshw -c network
*-network
description: Wireless interface
product: BCM4313 802.11b/g/n Wireless LAN Controller
vendor: Broadcom Corporation
physical id: 0
bus info: pci#0000:03:00.0
logical name: wlan0
version: 01
serial: 78:e4:00:4e:49:a3
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=brcmsmac driverversion=3.2.0-4-amd64 firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11bgn
resources: irq:19 memory:f1100000-f1103fff
Network Configuration
minimal /etc/network/interfaces as required by NetworManager
auto lo
iface lo inet loopback
.. and restart
Failure
No wifi network is detected and of course I can't connect using wlan0
it doesn't work.
I found informations here regarding WPA2/PSK wifi configuration on debian :
http://www.debian.org/doc/manuals/debian-reference/ch05.en.html#_the_wireless_lan_interface_with_wpa_wpa2
so I added this setup to my interfaces file an got :
auto lo
iface lo inet loopback
allow-hotplug wlan0
iface wlan0 inet dhcp
wpa-ssid Hznteam-Datacenter
# hexadecimal psk is encoded from a plaintext passphrase
wpa-psk 12345678901234567890123456
Same as above no wifi network detected and ifconfig gives no allocated ip address :
wlan0 Link encap:Ethernet HWaddr 78:e4:00:4e:49:a3
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
wlan0:avahi Link encap:Ethernet HWaddr 78:e4:00:4e:49:a3
inet addr:169.254.7.34 Bcast:169.254.255.255 Mask:255.255.0.0
UP BROADCAST MULTICAST MTU:1500 Metric:1
Note that my required WPA2/PSK AES key length is 26 chars as requested on my other PC that connect successfully to my wifi router
Any idea ? it's boring wasting hours on the same problem again ..
Help welcome ...
Wrong wifi kernel module selected
I should have installed the brcmsmac module instead of the brcm80211 one. The latter is the Squeeze version kernel module. Wheezy needs the brcmsmac module as mentioned here
Althouhg the package is named brcm80211 the kernel module to load for Wheezy is brcmsmac instead of brcm80211 for the Squeeze version
more detail in this StackoverFlow post and a summary is also available here
Interfaces
I also set the /etc/network/interfaces conf file to only
$ sudo nano /etc/network/interfaces
auto lo
iface lo inet loopback
this seems to allow Network-Manager to take any discovered interfaces in account.
Everything's OK. Wifi up and running now.
.. And so much wasted time for a stupid version error !