connected to router but not internet [SOLVED]

keither · 2009-10-11 21:49:09

So I'm posting this because I've ruled out all of the possibilities that I thought were reasonable. Let us begin with a short story:

A mere two hours ago my wireless was working well. I left for two hours with my computer, sat down at a cafe with free wireless and worked for a while. I was having some trouble connecting properly once I got to the cafe, so I messed around with a few things (took the wireless down, brought it back up, and then tried iwconfig and dhcp a few times). None of this worked, so I shrugged my shoulders and kept working with no wireless (I commonly go to this cafe and commonly have problems with their wireless network, so I did not take this as a sign that something was wrong).

I have now returned home and cannot connect to my wireless network at home. I am connected to my router, (netcfg runs without a hitch, iwconfig doesn't tell me "not associated") but I can't load any websites. I haven't had this problem previously. What might I have done at the cafe to mess things up?

Allow me to eliminate some usual suspects:

-- I am posting this using the wireless connection in my apartment from a different computer, so my connection is clearly fine
-- This should be obvious from the story above, but I'm confident that my wireless is enabled and so on, I haven't accidentally left the device down or hit a switch to turn the card off
--I didn't do anything weird with my configuration files or anything like that at the cafe; everything here is the same as it has been for the several weeks that it's been working with no problems
--I have used my wireless since the last time I ran sudo pacman -Syu, so I don't think it's related to any software update
--I can't ping any websites either, so it truly is a connection issue and not a browser issue or whatever

Does anybody have a hypothesis?

Thanks!

(edited to add the last usual suspect)

Last edited by keither (2009-10-12 13:43:07)

chpln · 2009-10-11 22:05:27

Could you check that /etc/resolv.conf is correct and are you able to ping via IP address?

keither · 2009-10-11 22:14:11

I've never really looked at resolv.conf, so I don't know what would be correct, but it shows

domain Belkin
nameserver 192.168.2.1

which seems okay, since i have a belkin router and that's the ip.

I actually cannot ping the router. Output is

$ping -c 3 192.168.2.1
ping: sendmsg: Network is unreachable
ping: sendmsg: Network is unreachable

--192.168.2.1 ping statistics ---
3 packets transmitted, 0 received, 100% packet loss, time 2009ms

vacant · 2009-10-11 22:21:03

Do output from the following give any clues?

ifconfig
iwlist scan
route -n
route
cat /etc/hosts

Do you get the much the same results whether you connect to your router wirelessly or wired?

keither · 2009-10-11 22:27:05

Actually, maybe. ifconfig gave "inet addr: 192.168.2.5", and I can ping this ip successfully. Is this meaningful?

edit: type-o

Last edited by keither (2009-10-11 22:27:29)

mcover · 2009-10-11 22:39:50

It would be helpful if you would post the output of all the commands that vacant mentioned:

ifconfig
iwlist scan
route -n
route
cat /etc/hosts

I'd also add

iwconfig
ip route #sometimes shows more than the old route

Your problem sounds a lot like a routing issue. Maybe dhcpcd giving you bad cached routes. You still have old routes in your routing-table (you did tear down the old connection completely, or even rebooted i suppose).

keither · 2009-10-11 22:48:04

So, I can't find my thumb drive, so this would be a lot of output for me to reproduce for you. I'll look around and try to paste all of this stuff here in a bit.

I did reboot when I returned.

keither · 2009-10-11 22:55:48

Okay, here goes:

$ ifconfig; iwlist scan; route -n; route; iwconfig; ip route; cat /etc/hosts
eth0      Link encap:Ethernet  HWaddr 00:22:19:F1:28:45                                                
          inet6 addr: fe80::222:19ff:fef1:2845/64 Scope:Link                                           
          UP BROADCAST MULTICAST  MTU:1500  Metric:1                                                   
          RX packets:44 errors:0 dropped:0 overruns:0 frame:0                                          
          TX packets:5 errors:0 dropped:0 overruns:0 carrier:0                                         
          collisions:0 txqueuelen:1000                                                                 
          RX bytes:5054 (4.9 Kb)  TX bytes:426 (426.0 b)                                               
          Interrupt:17                                                                                 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host     
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:55 errors:0 dropped:0 overruns:0 frame:0
          TX packets:55 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0                            
          RX bytes:4416 (4.3 Kb)  TX bytes:4416 (4.3 Kb)       

wlan0     Link encap:Ethernet  HWaddr 00:22:FB:B8:D2:D2  
          inet addr:192.168.2.5  Bcast:192.168.2.255  Mask:255.255.255.0
          inet6 addr: 2002:4751:83de:1234:222:fbff:feb8:d2d2/64 Scope:Global
          inet6 addr: fe80::222:fbff:feb8:d2d2/64 Scope:Link                
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1                
          RX packets:2550 errors:0 dropped:0 overruns:0 frame:0             
          TX packets:622 errors:0 dropped:0 overruns:0 carrier:0            
          collisions:0 txqueuelen:1000                                      
          RX bytes:323932 (316.3 Kb)  TX bytes:65488 (63.9 Kb)              

wmaster0  Link encap:UNSPEC  HWaddr 00-22-FB-B8-D2-D2-00-00-00-00-00-00-00-00-00-00  
          UP RUNNING  MTU:0  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)                                     

lo        Interface doesn't support scanning.

wmaster0  Interface doesn't support scanning.

wlan0     Scan completed :
          Cell 01 - Address: 00:22:75:39:BF:5C
                    Channel:1                 
                    Frequency:2.412 GHz (Channel 1)
                    Quality=54/70  Signal level=-56 dBm  
                    Encryption key:on                    
                    ESSID:"Apt106"                       
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 9 Mb/s
                              18 Mb/s; 36 Mb/s; 54 Mb/s                
                    Bit Rates:6 Mb/s; 12 Mb/s; 24 Mb/s; 48 Mb/s
                    Mode:Master
                    Extra:tsf=0000000120d87ce0
                    Extra: Last beacon: 190230ms ago
                    IE: Unknown: 0006417074313036
                    IE: Unknown: 010882848B961224486C
                    IE: Unknown: 030101
                    IE: Unknown: 2A0104
                    IE: Unknown: 32040C183060
                    IE: Unknown: 2D1AEC010FFFFF000000000000000000000000000000000000000000
                    IE: Unknown: 3D1601000700000000000000000000000000000000000000
                    IE: Unknown: 3E0100
                    IE: Unknown: DD180050F2020101000003A4000027A4000042435E0062322F00
                    IE: Unknown: 7F0101
                    IE: Unknown: DD07000C4300000000
                    IE: Unknown: DD1E00904C33EC010FFFFF000000000000000000000000000000000000000000
                    IE: Unknown: DD1A00904C3401000700000000000000000000000000000000000000

eth0      Interface doesn't support scanning.

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.2.0     0.0.0.0         255.255.255.0   U     303    0        0 wlan0
0.0.0.0         192.168.2.1     0.0.0.0         UG    303    0        0 wlan0
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.2.0     *               255.255.255.0   U     303    0        0 wlan0
default         192.168.2.1     0.0.0.0         UG    303    0        0 wlan0
lo        no wireless extensions.

wmaster0  no wireless extensions.

wlan0     IEEE 802.11abgn  ESSID:"Apt106"
          Mode:Managed  Frequency:2.412 GHz  Access Point: 00:22:75:39:BF:5C
          Bit Rate=0 kb/s   Tx-Power=15 dBm
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=60/70  Signal level=-50 dBm  Noise level=-87 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0

eth0      no wireless extensions.

192.168.2.0/24 dev wlan0  proto kernel  scope link  src 192.168.2.5  metric 303
default via 192.168.2.1 dev wlan0  metric 303
#
# /etc/hosts: static lookup table for host names
#

#<ip-address>   <hostname.domain.org>   <hostname>
127.0.0.1               localhost.localdomain   localhost My-Host

# End of file

keither · 2009-10-12 01:07:42

Okay, I opened wicd and used non-dhcdcp settings and everything is working, so I think it has something to do with dhcdcp. I won't mark this solved yet because I'd like to know what the deal is with dhcdcp (or netcfg) that's keeping me from getting online. I prefer not to have to point and click around all the time.

vacant · 2009-10-12 08:55:37

As far as I can see that all looks fine. I been using wicd for my wireless and wired connection for ages so good choice.

Sometimes disabling ipv6 can enable dhcp to work (I've found this on several PCs), I also seem to remember hearing that disabling ipv6 can speed up traffic.

Last edited by vacant (2009-10-12 08:56:13)

keither · 2009-10-12 13:42:46

Okay, well my initial problem is solved. I really love netcfg and want to use it again, so I'll keep trying to figure that out. Thanks everyone!

Arch Linux

#1 2009-10-11 21:49:09

connected to router but not internet [SOLVED]

#2 2009-10-11 22:05:27

Re: connected to router but not internet [SOLVED]

#3 2009-10-11 22:14:11

Re: connected to router but not internet [SOLVED]

#4 2009-10-11 22:21:03

Re: connected to router but not internet [SOLVED]

#5 2009-10-11 22:27:05

Re: connected to router but not internet [SOLVED]

#6 2009-10-11 22:39:50

Re: connected to router but not internet [SOLVED]

#7 2009-10-11 22:48:04

Re: connected to router but not internet [SOLVED]

#8 2009-10-11 22:55:48

Re: connected to router but not internet [SOLVED]

#9 2009-10-12 01:07:42

Re: connected to router but not internet [SOLVED]

#10 2009-10-12 08:55:37

Re: connected to router but not internet [SOLVED]

#11 2009-10-12 13:42:46

Re: connected to router but not internet [SOLVED]

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