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Routing, network cards, OSI, etc. Anything is fair game. |
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12-12-2013, 04:13 AM
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#1
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Member
Registered: Sep 2012
Distribution: Manjaro KDE... It's awesome...
Posts: 36
Rep:
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Wireless Just Stopped Working
I seem to have developed a bizarre issue with my wireless access, it literally seems to have just stopped working. I'm sure that someone can help me figure out what's gone on, but it has me stumped!
I'm running Linux Mint 15, all updated, on a modern Sony Vaio laptop.
The network card does connect to the router but no wireless internet access is available. Other machines connect fine to the router and have internet access, as did my Vaio laptop until something happened. The connection is via the ath9k driver.
Unfortunately, I lack the skills to be able to diagnose the problem here, but I'm hoping some kind soul will be able to point me in the right direction so we can figure out what's gone on and repair the issue.
Any help greatly appreciated!
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12-12-2013, 04:38 AM
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#2
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LQ Addict
Registered: Nov 2013
Location: Tokyo
Distribution: Mostly Ubuntu and Centos
Posts: 6,316
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Quote:
Originally Posted by evolver
I seem to have developed a bizarre issue with my wireless access, it literally seems to have just stopped working.
[...]
The network card does connect to the router
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How do you know?
Quote:
but no wireless internet access is available. Other machines connect fine to the router and have internet access, as did my Vaio laptop until something happened. The connection is via the ath9k driver.
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There are wireless LAN Howto documents, but they are old and/or for the very technically inclined. Google for "wlan linux" and you are bound to find the Howto from the linux documentation project (TLDP), the ancient document written by Jean Tourrilhes, and a setup guide on the Archlinux wiki, which looks very good.
Mint-specific resources exist as well (google "wlan0 linux mint"), even a youtube video showing you how to install wireless. Maybe it makes sense to follow those instructions. Or post in the Mint forum.
As a first step, you may want to run the iwconfig command in a terminal window. It will show you the connection status of your WLAN interface(s), and the name(s) of your interface(s), probably wlan0 or so. Then run the ifconfig command, which shows if an IP address has been configured for the interface.
I don't know how Mint manages network interfaces, but on my system, the tool is NetworkManager. It sends its errors and warnings to the system log file, in your case probably /var/log/syslog. As root, you can grep -i networkmanager /var/log/syslog to see what it says; maybe you detect some error messages.
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12-12-2013, 04:57 AM
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#3
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Member
Registered: Sep 2012
Distribution: Manjaro KDE... It's awesome...
Posts: 36
Original Poster
Rep:
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iwconfig:
Code:
wlan0 IEEE 802.11bgn ESSID:"WLAN_02"
Mode:Managed Frequency:2.452 GHz Access Point: **:**:**:**:**:**
Bit Rate=1 Mb/s Tx-Power=16 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
Link Quality=29/70 Signal level=-81 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:22 Invalid misc:28 Missed beacon:0
ifconfig:
Code:
wlan0 Link encap:Ethernet HWaddr **:**:**:**:**:**
inet addr:192.168.172.2 Bcast:192.168.172.255 Mask:255.255.255.0
inet6 addr: ****::****:****:****:****/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:26760 errors:0 dropped:0 overruns:0 frame:0
TX packets:26232 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1900682 (1.9 MB) TX bytes:2541485 (2.5 MB)
Code:
grep -i networkmanager /var/log/syslog
Dec 12 08:42:12 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (eth0) starting connection 'Neil's'
Dec 12 08:42:12 0000-0000-0000-0001 NetworkManager[1028]: <info> (eth0): device state change: disconnected -> prepare (reason 'none') [30 40 0]
Dec 12 08:42:12 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (eth0) Stage 1 of 5 (Device Prepare) scheduled...
Dec 12 08:42:12 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (eth0) Stage 1 of 5 (Device Prepare) started...
Dec 12 08:42:12 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (eth0) Stage 2 of 5 (Device Configure) scheduled...
Dec 12 08:42:12 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (eth0) Stage 1 of 5 (Device Prepare) complete.
Dec 12 08:42:12 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (eth0) Stage 2 of 5 (Device Configure) starting...
Dec 12 08:42:12 0000-0000-0000-0001 NetworkManager[1028]: <info> (eth0): device state change: prepare -> config (reason 'none') [40 50 0]
Dec 12 08:42:12 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (eth0) Stage 2 of 5 (Device Configure) successful.
Dec 12 08:42:12 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (eth0) Stage 3 of 5 (IP Configure Start) scheduled.
Dec 12 08:42:12 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (eth0) Stage 2 of 5 (Device Configure) complete.
Dec 12 08:42:12 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (eth0) Stage 3 of 5 (IP Configure Start) started...
Dec 12 08:42:12 0000-0000-0000-0001 NetworkManager[1028]: <info> (eth0): device state change: config -> ip-config (reason 'none') [50 70 0]
Dec 12 08:42:12 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (eth0) Beginning DHCPv4 transaction (timeout in 45 seconds)
Dec 12 08:42:12 0000-0000-0000-0001 NetworkManager[1028]: <info> dhclient started with pid 13393
Dec 12 08:42:12 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (eth0) Stage 3 of 5 (IP Configure Start) complete.
Dec 12 08:42:12 0000-0000-0000-0001 NetworkManager[1028]: <info> (eth0): DHCPv4 state changed nbi -> preinit
Dec 12 08:42:12 0000-0000-0000-0001 NetworkManager[1028]: <info> (eth0): DHCPv4 state changed preinit -> reboot
Dec 12 08:42:12 0000-0000-0000-0001 NetworkManager[1028]: <info> address 192.168.172.5
Dec 12 08:42:12 0000-0000-0000-0001 NetworkManager[1028]: <info> prefix 24 (255.255.255.0)
Dec 12 08:42:12 0000-0000-0000-0001 NetworkManager[1028]: <info> gateway 192.168.172.1
Dec 12 08:42:12 0000-0000-0000-0001 NetworkManager[1028]: <info> nameserver '37.130.150.6'
Dec 12 08:42:12 0000-0000-0000-0001 NetworkManager[1028]: <info> nameserver '37.130.151.6'
Dec 12 08:42:12 0000-0000-0000-0001 NetworkManager[1028]: <info> domain name 'radiocable.net'
Dec 12 08:42:12 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (eth0) Stage 5 of 5 (IPv4 Configure Commit) scheduled...
Dec 12 08:42:12 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (eth0) Stage 5 of 5 (IPv4 Commit) started...
Dec 12 08:42:13 0000-0000-0000-0001 NetworkManager[1028]: <info> (eth0): device state change: ip-config -> secondaries (reason 'none') [70 90 0]
Dec 12 08:42:13 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (eth0) Stage 5 of 5 (IPv4 Commit) complete.
Dec 12 08:42:13 0000-0000-0000-0001 NetworkManager[1028]: <info> (eth0): device state change: secondaries -> activated (reason 'none') [90 100 0]
Dec 12 08:42:13 0000-0000-0000-0001 NetworkManager[1028]: <info> Policy set 'Neil's' (eth0) as default for IPv4 routing and DNS.
Dec 12 08:42:13 0000-0000-0000-0001 NetworkManager[1028]: <info> Writing DNS information to /sbin/resolvconf
Dec 12 08:42:14 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (eth0) successful, device activated.
Dec 12 09:09:02 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (wlan0) starting connection 'WLAN_02'
Dec 12 09:09:02 0000-0000-0000-0001 NetworkManager[1028]: <info> (wlan0): device state change: disconnected -> prepare (reason 'none') [30 40 0]
Dec 12 09:09:02 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (wlan0) Stage 1 of 5 (Device Prepare) scheduled...
Dec 12 09:09:02 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (wlan0) Stage 1 of 5 (Device Prepare) started...
Dec 12 09:09:02 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (wlan0) Stage 2 of 5 (Device Configure) scheduled...
Dec 12 09:09:02 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (wlan0) Stage 1 of 5 (Device Prepare) complete.
Dec 12 09:09:02 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (wlan0) Stage 2 of 5 (Device Configure) starting...
Dec 12 09:09:02 0000-0000-0000-0001 NetworkManager[1028]: <info> (wlan0): device state change: prepare -> config (reason 'none') [40 50 0]
Dec 12 09:09:02 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (wlan0/wireless): access point 'WLAN_02' has security, but secrets are required.
Dec 12 09:09:02 0000-0000-0000-0001 NetworkManager[1028]: <info> (wlan0): device state change: config -> need-auth (reason 'none') [50 60 0]
Dec 12 09:09:02 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (wlan0) Stage 2 of 5 (Device Configure) complete.
Dec 12 09:09:02 0000-0000-0000-0001 NetworkManager[1028]: get_secret_flags: assertion `is_secret_prop (setting, secret_name, error)' failed
Dec 12 09:09:02 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (wlan0) Stage 1 of 5 (Device Prepare) scheduled...
Dec 12 09:09:02 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (wlan0) Stage 1 of 5 (Device Prepare) started...
Dec 12 09:09:02 0000-0000-0000-0001 NetworkManager[1028]: <info> (wlan0): device state change: need-auth -> prepare (reason 'none') [60 40 0]
Dec 12 09:09:02 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (wlan0) Stage 2 of 5 (Device Configure) scheduled...
Dec 12 09:09:02 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (wlan0) Stage 1 of 5 (Device Prepare) complete.
Dec 12 09:09:02 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (wlan0) Stage 2 of 5 (Device Configure) starting...
Dec 12 09:09:02 0000-0000-0000-0001 NetworkManager[1028]: <info> (wlan0): device state change: prepare -> config (reason 'none') [40 50 0]
Dec 12 09:09:02 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (wlan0/wireless): connection 'WLAN_02' has security, and secrets exist. No new secrets needed.
Dec 12 09:09:02 0000-0000-0000-0001 NetworkManager[1028]: <info> Config: added 'ssid' value 'WLAN_02'
Dec 12 09:09:02 0000-0000-0000-0001 NetworkManager[1028]: <info> Config: added 'scan_ssid' value '1'
Dec 12 09:09:02 0000-0000-0000-0001 NetworkManager[1028]: <info> Config: added 'key_mgmt' value 'NONE'
Dec 12 09:09:02 0000-0000-0000-0001 NetworkManager[1028]: <info> Config: added 'auth_alg' value 'OPEN'
Dec 12 09:09:02 0000-0000-0000-0001 NetworkManager[1028]: <info> Config: added 'wep_key0' value '<omitted>'
Dec 12 09:09:02 0000-0000-0000-0001 NetworkManager[1028]: <info> Config: added 'wep_tx_keyidx' value '0'
Dec 12 09:09:02 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (wlan0) Stage 2 of 5 (Device Configure) complete.
Dec 12 09:09:02 0000-0000-0000-0001 NetworkManager[1028]: <info> Config: set interface ap_scan to 1
Dec 12 09:09:02 0000-0000-0000-0001 NetworkManager[1028]: <info> (wlan0): supplicant interface state: disconnected -> scanning
Dec 12 09:09:03 0000-0000-0000-0001 NetworkManager[1028]: <info> (wlan0): supplicant interface state: scanning -> authenticating
Dec 12 09:09:03 0000-0000-0000-0001 NetworkManager[1028]: <info> (wlan0): supplicant interface state: authenticating -> completed
Dec 12 09:09:03 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (wlan0/wireless) Stage 2 of 5 (Device Configure) successful. Connected to wireless network 'WLAN_02'.
Dec 12 09:09:03 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (wlan0) Stage 3 of 5 (IP Configure Start) scheduled.
Dec 12 09:09:03 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (wlan0) Stage 3 of 5 (IP Configure Start) started...
Dec 12 09:09:03 0000-0000-0000-0001 NetworkManager[1028]: <info> (wlan0): device state change: config -> ip-config (reason 'none') [50 70 0]
Dec 12 09:09:03 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (wlan0) Beginning DHCPv4 transaction (timeout in 45 seconds)
Dec 12 09:09:03 0000-0000-0000-0001 NetworkManager[1028]: <info> dhclient started with pid 26638
Dec 12 09:09:03 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (wlan0) Stage 3 of 5 (IP Configure Start) complete.
Dec 12 09:09:03 0000-0000-0000-0001 NetworkManager[1028]: <info> (wlan0): DHCPv4 state changed nbi -> preinit
Dec 12 09:09:03 0000-0000-0000-0001 NetworkManager[1028]: <info> (wlan0): DHCPv4 state changed preinit -> expire
Dec 12 09:09:03 0000-0000-0000-0001 NetworkManager[1028]: <info> (wlan0): DHCPv4 state changed expire -> preinit
Dec 12 09:09:04 0000-0000-0000-0001 NetworkManager[1028]: <info> (wlan0): DHCPv4 state changed preinit -> bound
Dec 12 09:09:04 0000-0000-0000-0001 NetworkManager[1028]: <info> address 192.168.172.2
Dec 12 09:09:04 0000-0000-0000-0001 NetworkManager[1028]: <info> prefix 24 (255.255.255.0)
Dec 12 09:09:04 0000-0000-0000-0001 NetworkManager[1028]: <info> gateway 192.168.172.1
Dec 12 09:09:04 0000-0000-0000-0001 NetworkManager[1028]: <info> nameserver '37.130.150.6'
Dec 12 09:09:04 0000-0000-0000-0001 NetworkManager[1028]: <info> nameserver '37.130.151.6'
Dec 12 09:09:04 0000-0000-0000-0001 NetworkManager[1028]: <info> domain name 'radiocable.net'
Dec 12 09:09:04 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (wlan0) Stage 5 of 5 (IPv4 Configure Commit) scheduled...
Dec 12 09:09:04 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (wlan0) Stage 5 of 5 (IPv4 Commit) started...
Dec 12 09:09:05 0000-0000-0000-0001 NetworkManager[1028]: <info> (wlan0): device state change: ip-config -> secondaries (reason 'none') [70 90 0]
Dec 12 09:09:05 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (wlan0) Stage 5 of 5 (IPv4 Commit) complete.
Dec 12 09:09:05 0000-0000-0000-0001 NetworkManager[1028]: <info> (wlan0): device state change: secondaries -> activated (reason 'none') [90 100 0]
Dec 12 09:09:05 0000-0000-0000-0001 NetworkManager[1028]: <info> Writing DNS information to /sbin/resolvconf
Dec 12 09:09:05 0000-0000-0000-0001 NetworkManager[1028]: <info> Activation (wlan0) successful, device activated.
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1 members found this post helpful.
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12-12-2013, 07:29 AM
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#4
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LQ Addict
Registered: Nov 2013
Location: Tokyo
Distribution: Mostly Ubuntu and Centos
Posts: 6,316
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Quote:
Originally Posted by evolver
ifconfig:
Code:
wlan0 Link encap:Ethernet HWaddr **:**:**:**:**:**
inet addr:192.168.172.2 Bcast:192.168.172.255 Mask:255.255.255.0
inet6 addr: ****::****:****:****:****/64 Scope:Link
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At first glance, nothing seems to be wrong, and you have an IP address, 192.168.172.2. Is this the same network as the other systems, i.e. do the other addresses start with 192.168.172? If yes, what makes you say that you have no connectivity?
I haven't taken the time to look at the syslog output, but I don't know anyway if I can interpret it well.
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12-12-2013, 07:48 AM
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#5
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Member
Registered: Sep 2012
Distribution: Manjaro KDE... It's awesome...
Posts: 36
Original Poster
Rep:
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The connectivity problem arises from the fact that none of my applications can access the internet (Thunderbird, Firefox, Skype to name a few). As I said in the original post, everything worked fine, and then suddenly no access to internet despite being connected to a router which functions fine for other machines.
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12-12-2013, 08:25 AM
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#6
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Member
Registered: Sep 2012
Distribution: Manjaro KDE... It's awesome...
Posts: 36
Original Poster
Rep:
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Just to add, it maybe that I am connected to the internet, just that the speed is so slow as to make everything unavailable. In Mint, Network Manager has a Traffic graphic that in my case shows the connection speed oscillating between 0kbps and 1kbps. Again nothing loads, and the internet is, for all intents and purposes, unavailable, but it may just be connected and throttled, for some as yet unknown reason.
All help much appreciated!
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12-12-2013, 09:19 AM
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#7
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LQ Addict
Registered: Nov 2013
Location: Tokyo
Distribution: Mostly Ubuntu and Centos
Posts: 6,316
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Quote:
Originally Posted by evolver
Just to add, it maybe that I am connected to the internet, just that the speed is so slow as to make everything unavailable. In Mint, Network Manager has a Traffic graphic that in my case shows the connection speed oscillating between 0kbps and 1kbps. Again nothing loads, and the internet is, for all intents and purposes, unavailable, but it may just be connected and throttled, for some as yet unknown reason.
All help much appreciated!
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The basic test for internet connectivity is ping. For example ping 8.8.8.8, which accesses Google's public DNS server.
I would also be curious if a non-GUI internet tool such as wget or ftp is slow. For example wget ftp://ftp.gnupg.org/gcrypt/gnupg/gnupg-2.0.21.tar.bz2. What's the result? If you don't have wget, perhaps curl, or ftp to download that file. Or just enter this URL in Firefox.
Can you test connectivity to or from other devices connected to the router, and the speed?
Is anything else besides networking slow?
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12-12-2013, 05:35 PM
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#8
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Member
Registered: Jan 2009
Location: Sydney, Australia
Distribution: Fedora,CentOS
Posts: 751
Rep:
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Hi, AAMOI is this a home router or shared? Does the lappy have a fixed or dynamic IP address?
This may be of no interest but...my wifi router at home has a MAC address filter - if I haven't identified devices they can't use the router. 2 days ago my son in law (who lives with us) told me his phone couldn't connect. I went thru all the usual questions and connected - no problem. But he kept saying it couldn't connect. Same as you, it seemed to connect but no activity. Finally he told me it was actually a new phone. Doh! I added the MAC address to the router and all was good.
So has anything changed in the whole config?
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12-12-2013, 05:45 PM
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#9
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LQ Addict
Registered: Nov 2013
Location: Tokyo
Distribution: Mostly Ubuntu and Centos
Posts: 6,316
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Quote:
Originally Posted by timl
Hi, AAMOI is this a home router or shared? Does the lappy have a fixed or dynamic IP address?
This may be of no interest but...my wifi router at home has a MAC address filter - if I haven't identified devices they can't use the router. 2 days ago my son in law (who lives with us) told me his phone couldn't connect. I went thru all the usual questions and connected - no problem. But he kept saying it couldn't connect. Same as you, it seemed to connect but no activity. Finally he told me it was actually a new phone. Doh! I added the MAC address to the router and all was good.
So has anything changed in the whole config?
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The original poster is connected via DHCP.
Looking at the NWManager output, I just noticed that this system is also connected via eth0, i.e. a wired LAN interface. It has two IP addresses, 192.168.172.2 and ....5. That shouldn't be a problem, but I wonder what happens if one of the two is disconnected.
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12-13-2013, 02:05 PM
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#10
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Member
Registered: Sep 2012
Distribution: Manjaro KDE... It's awesome...
Posts: 36
Original Poster
Rep:
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Hi.. struggling to recreate the conditions of yesterday when I was getting a fluctuating connections speed ~1kbps showing on the Network Manager Traffic graphic, but Ping results confirm no connection is available:
Code:
ping -I wlan0 8.8.8.8
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--- 8.8.8.8 ping statistics ---
7069 packets transmitted, 0 received, +7069 errors, 100% packet loss, time 7077585ms
It's a home connection, and the Wired connecction is my workaround for the wifi not being available, removing the wired connection leaves me without any access.
The laptop did connect fine until a day or two ago, so I know it's not a problem with allowing the MAC address on the router...
Still more than a bit puzzled by this... any further suggestions appreciated!
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12-13-2013, 04:10 PM
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#11
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Member
Registered: Jan 2009
Location: Sydney, Australia
Distribution: Fedora,CentOS
Posts: 751
Rep:
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evolver. This is something of a longshot so I will explain my logic first. My understanding is that, even though you are connected via DHCP, the router allocates the same IP address to the same MAC address. I don't know whether the router actually ties an IP add to each MAC add.
As you have a laptop you are rebooting frequently so DHCP is allocating you a "new" IP address each time. Even though that is probably the same address as before.
My logic then says that another device could have grabbed that IP address while your laptop was dormant! So you are allocated an IP address by the router but it conflicts with another device! Like I say, a bit of a longshot.
One way to prove this would be to set up a static IP address and see whether this makes a difference.
Network gurus: feel free to tell me if I am spouting nonesense
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