Can't browse internet at university, works fine in Windows

pdedecker · March 30, 2011, 6:14pm

I’m not able to connect to my university’s internet facilities under openSUSE 11.4. I have been able to connect in the past and I am still able to connect in Windows 7.

Here’s a summary of my findings:

openSUSE 11.4 + Home WiFi: works
openSUSE 11.4 + Home Ethernet: works
openSUSE 11.4 + University WiFi: doesn’t work
openSUSE 11.4 + University Ethernet: doesn’t work
Windows 7 + Any Internet Connection I’ve Tried: works

When I try to connect to the university WiFi, a valid IP address is assigned to me and the gateway address appears to be correct, so I don’t see a problem in the DHCP negotations. Same with my university’s Ethernet: I get a valid IP address, but I can’t connect to the internet.

When I browse to any site with Chromium/Chrome/Firefox/lynx/curl, the page is stuck at “Sending request”. I have tried disabling my firewall - that didn’t solve anything.

I don’t know what else I can try and the campus’ network administrators are puzzled. How can I resolve my issue?

ab · March 30, 2011, 7:30pm

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Hash: SHA1

Post the output from the following commands when on WiFi or wired at school:

ip addr
ip route
ip -s link
grep -v ‘^#’ /etc/resolv.conf
ping -c 2 8.8.8.8
ping -c 2 google.com

Good luck.

On 03/30/2011 10:36 AM, pdedecker wrote:
>
> I’m not able to connect to my university’s internet facilities under
> openSUSE 11.4. I have been able to connect in the past and I am still
> able to connect in Windows 7.
>
> Here’s a summary of my findings:
>
>
> - openSUSE 11.4 + Home WiFi: works
> - openSUSE 11.4 + Home Ethernet: works
> - openSUSE 11.4 + University WiFi: doesn’t work
> - openSUSE 11.4 + University Ethernet: doesn’t work
> - Windows 7 + Any Internet Connection I’ve Tried: works
>
> When I try to connect to the university WiFi, a valid IP address is
> assigned to me and the gateway address appears to be correct, so I don’t
> see a problem in the DHCP negotations. Same with my university’s
> Ethernet: I get a valid IP address, but I can’t connect to the
> internet.
>
> When I browse to any site with Chromium/Chrome/Firefox/lynx/curl, the
> page is stuck at “Sending request”. I have tried disabling my firewall -
> that didn’t solve anything.
>
> I don’t know what else I can try and the campus’ network administrators
> are puzzled. How can I resolve my issue?
>
>
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drab · March 31, 2011, 3:13am

pdedecker wrote:

>
> I’m not able to connect to my university’s internet facilities under
> openSUSE 11.4. I have been able to connect in the past and I am still
> able to connect in Windows 7.
>
> Here’s a summary of my findings:
>
>
> - openSUSE 11.4 + Home WiFi: works
> - openSUSE 11.4 + Home Ethernet: works
> - openSUSE 11.4 + University WiFi: doesn’t work
> - openSUSE 11.4 + University Ethernet: doesn’t work
> - Windows 7 + Any Internet Connection I’ve Tried: works
>
> When I try to connect to the university WiFi, a valid IP address is
> assigned to me and the gateway address appears to be correct, so I don’t
> see a problem in the DHCP negotations. Same with my university’s
> Ethernet: I get a valid IP address, but I can’t connect to the
> internet.
>
> When I browse to any site with Chromium/Chrome/Firefox/lynx/curl, the
> page is stuck at “Sending request”. I have tried disabling my firewall -
> that didn’t solve anything.
>
> I don’t know what else I can try and the campus’ network administrators
> are puzzled. How can I resolve my issue?
>

Is it a name resolution, perhaps specifically IPV6, issue?

Can you browse with firefox to http://74.125.225.20 (www.google.com)?

–
Don

pdedecker · March 31, 2011, 10:55am

Here’s the requested data. I was connected to the university WiFi at the time.

pdedecker@linux-qhij:~> ip addr                                                                                                                                                             
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN                                                                                                                                  
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00                                                                                                                                            
    inet 127.0.0.1/8 brd 127.255.255.255 scope host lo                                                                                                                                               
    inet6 ::1/128 scope host                                                                                                                                                                         
       valid_lft forever preferred_lft forever                                                                                                                                                       
2: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN qlen 1000                                                                                                          
    link/ether 1c:c1:de:91:54:1a brd ff:ff:ff:ff:ff:ff                                                                                                                                               
3: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
    link/ether 00:27:10:2f:1a:dc brd ff:ff:ff:ff:ff:ff
    inet 10.5.244.210/16 brd 10.5.255.255 scope global wlan0
    inet6 fe80::227:10ff:fe2f:1adc/64 scope link 
       valid_lft forever preferred_lft forever
4: vmnet1: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast state DOWN qlen 1000
    link/ether 00:50:56:c0:00:01 brd ff:ff:ff:ff:ff:ff
5: vmnet8: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast state DOWN qlen 1000
    link/ether 00:50:56:c0:00:08 brd ff:ff:ff:ff:ff:ff
10.5.0.0/16 dev wlan0  proto kernel  scope link  src 10.5.244.210  metric 2                                                                                                                          
default via 10.5.0.1 dev wlan0  proto static       
pdedecker@linux-qhij:~> grep -v '^#' /etc/resolv.conf
search home                                                                  
nameserver 192.168.1.1
pdedecker@linux-qhij:~> ping -c 2 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.

--- 8.8.8.8 ping statistics ---
2 packets transmitted, 0 received, 100% packet loss, time 999ms

pdedecker@linux-qhij:~> ping -c 2 google.com
ping: unknown host google.com

I tried pinging myself. That did work.

pdedecker@linux-qhij:~> ping -c 2 10.5.244.210
PING 10.5.244.210 (10.5.244.210) 56(84) bytes of data.
64 bytes from 10.5.244.210: icmp_req=1 ttl=64 time=0.038 ms
64 bytes from 10.5.244.210: icmp_req=2 ttl=64 time=0.045 ms

--- 10.5.244.210 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1000ms
rtt min/avg/max/mdev = 0.038/0.041/0.045/0.007 ms

pdedecker · March 31, 2011, 11:20am

I realized I forgot some commands, so I regathered the data. I used the university’s wired network this time.

pdedecker@linux-qhij:~> ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 brd 127.255.255.255 scope host lo
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 1c:c1:de:91:54:1a brd ff:ff:ff:ff:ff:ff
    inet 192.168.9.175/24 brd 192.168.9.255 scope global eth0
    inet6 fe80::1ec1:deff:fe91:541a/64 scope link 
       valid_lft forever preferred_lft forever
3: wlan0: <BROADCAST,MULTICAST> mtu 1500 qdisc mq state DOWN qlen 1000
    link/ether 00:27:10:2f:1a:dc brd ff:ff:ff:ff:ff:ff
4: vmnet1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000
    link/ether 00:50:56:c0:00:01 brd ff:ff:ff:ff:ff:ff
    inet 192.168.2.1/24 brd 192.168.2.255 scope global vmnet1
    inet6 fe80::250:56ff:fec0:1/64 scope link 
       valid_lft forever preferred_lft forever
5: vmnet8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000
    link/ether 00:50:56:c0:00:08 brd ff:ff:ff:ff:ff:ff
    inet 172.16.19.1/24 brd 172.16.19.255 scope global vmnet8
    inet6 fe80::250:56ff:fec0:8/64 scope link 
       valid_lft forever preferred_lft forever                                                                                                                                                       
pdedecker@linux-qhij:~> ip route                                                                                                                                         
172.16.19.0/24 dev vmnet8  proto kernel  scope link  src 172.16.19.1                                                                                                                                 
192.168.2.0/24 dev vmnet1  proto kernel  scope link  src 192.168.2.1                                                                                                                                 
192.168.9.0/24 dev eth0  proto kernel  scope link  src 192.168.9.175  metric 1                                                                                                                       
default via 192.168.9.1 dev eth0  proto static                                                                                                                                                       
pdedecker@linux-qhij:~> ip -s link                                                                                                                                        
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN                                                                                                                                  
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00                                                                                                                                            
    RX: bytes  packets  errors  dropped overrun mcast                                                                                                                                                
    35687      197      0       0       0       0                                                                                                                                                    
    TX: bytes  packets  errors  dropped carrier collsns                                                                                                                                              
    35687      197      0       0       0       0                                                                                                                                                    
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000                                                                                                              
    link/ether 1c:c1:de:91:54:1a brd ff:ff:ff:ff:ff:ff                                                                                                                                               
    RX: bytes  packets  errors  dropped overrun mcast                                                                                                                                                
    87290      910      0       0       0       8                                                                                                                                                    
    TX: bytes  packets  errors  dropped carrier collsns                                                                                                                                              
    56197      670      0       0       0       0                                                                                                                                                    
3: wlan0: <BROADCAST,MULTICAST> mtu 1500 qdisc mq state DOWN qlen 1000                                                                                                                               
    link/ether 00:27:10:2f:1a:dc brd ff:ff:ff:ff:ff:ff                                                                                                                                               
    RX: bytes  packets  errors  dropped overrun mcast                                                                                                                                                
    41072      188      0       0       0       0                                                                                                                                                    
    TX: bytes  packets  errors  dropped carrier collsns                                                                                                                                              
    6168       25       0       0       0       0                                                                                                                                                    
4: vmnet1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000                                                                                                       
    link/ether 00:50:56:c0:00:01 brd ff:ff:ff:ff:ff:ff                                                                                                                                               
    RX: bytes  packets  errors  dropped overrun mcast                                                                                                                                                
    0          0        0       0       0       0      
    TX: bytes  packets  errors  dropped carrier collsns 
    0          30       0       0       0       0      
5: vmnet8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000
    link/ether 00:50:56:c0:00:08 brd ff:ff:ff:ff:ff:ff
    RX: bytes  packets  errors  dropped overrun mcast   
    0          0        0       0       0       0      
    TX: bytes  packets  errors  dropped carrier collsns 
    0          30       0       0       0       0      
pdedecker@linux-qhij:~> grep -v '^#' /etc/resolv.conf
search home
nameserver 192.168.1.1
pdedecker@linux-qhij:~> ping -c 2 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.

--- 8.8.8.8 ping statistics ---
2 packets transmitted, 0 received, 100% packet loss, time 1000ms

pdedecker@linux-qhij:~> ping -c 2 google.com
ping: unknown host google.com
pdedecker@linux-qhij:~>

ab · March 31, 2011, 2:16pm

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Well the problem is pretty clear… your DNS server is set to 192.168.1.1
which may be leftover from when you’re at home. Try fixing it with the
following command:

sudo /sbin/netconfig -f update

This can happen if you (or something on your system other than
NetworkManager) ever manually modifies the /etc/resolv.conf file.

Good luck.

On 03/31/2011 03:36 AM, pdedecker wrote:
>
> I realized I forgot some commands, so I regathered the data. I used the
> university’s wired network this time.
>
>
> Code:
> --------------------
> pdedecker@linux-qhij:~> ip addr
> 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
> link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
> inet 127.0.0.1/8 brd 127.255.255.255 scope host lo
> inet6 ::1/128 scope host
> valid_lft forever preferred_lft forever
> 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
> link/ether 1c:c1:de:91:54:1a brd ff:ff:ff:ff:ff:ff
> inet 192.168.9.175/24 brd 192.168.9.255 scope global eth0
> inet6 fe80::1ec1:deff:fe91:541a/64 scope link
> valid_lft forever preferred_lft forever
> 3: wlan0: <BROADCAST,MULTICAST> mtu 1500 qdisc mq state DOWN qlen 1000
> link/ether 00:27:10:2f:1a:dc brd ff:ff:ff:ff:ff:ff
> 4: vmnet1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000
> link/ether 00:50:56:c0:00:01 brd ff:ff:ff:ff:ff:ff
> inet 192.168.2.1/24 brd 192.168.2.255 scope global vmnet1
> inet6 fe80::250:56ff:fec0:1/64 scope link
> valid_lft forever preferred_lft forever
> 5: vmnet8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000
> link/ether 00:50:56:c0:00:08 brd ff:ff:ff:ff:ff:ff
> inet 172.16.19.1/24 brd 172.16.19.255 scope global vmnet8
> inet6 fe80::250:56ff:fec0:8/64 scope link
> valid_lft forever preferred_lft forever
> pdedecker@linux-qhij:~> ip route
> 172.16.19.0/24 dev vmnet8 proto kernel scope link src 172.16.19.1
> 192.168.2.0/24 dev vmnet1 proto kernel scope link src 192.168.2.1
> 192.168.9.0/24 dev eth0 proto kernel scope link src 192.168.9.175 metric 1
> default via 192.168.9.1 dev eth0 proto static
> pdedecker@linux-qhij:~> ip -s link
> 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
> link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
> RX: bytes packets errors dropped overrun mcast
> 35687 197 0 0 0 0
> TX: bytes packets errors dropped carrier collsns
> 35687 197 0 0 0 0
> 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
> link/ether 1c:c1:de:91:54:1a brd ff:ff:ff:ff:ff:ff
> RX: bytes packets errors dropped overrun mcast
> 87290 910 0 0 0 8
> TX: bytes packets errors dropped carrier collsns
> 56197 670 0 0 0 0
> 3: wlan0: <BROADCAST,MULTICAST> mtu 1500 qdisc mq state DOWN qlen 1000
> link/ether 00:27:10:2f:1a:dc brd ff:ff:ff:ff:ff:ff
> RX: bytes packets errors dropped overrun mcast
> 41072 188 0 0 0 0
> TX: bytes packets errors dropped carrier collsns
> 6168 25 0 0 0 0
> 4: vmnet1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000
> link/ether 00:50:56:c0:00:01 brd ff:ff:ff:ff:ff:ff
> RX: bytes packets errors dropped overrun mcast
> 0 0 0 0 0 0
> TX: bytes packets errors dropped carrier collsns
> 0 30 0 0 0 0
> 5: vmnet8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000
> link/ether 00:50:56:c0:00:08 brd ff:ff:ff:ff:ff:ff
> RX: bytes packets errors dropped overrun mcast
> 0 0 0 0 0 0
> TX: bytes packets errors dropped carrier collsns
> 0 30 0 0 0 0
> pdedecker@linux-qhij:~> grep -v ‘^#’ /etc/resolv.conf
> search home
> nameserver 192.168.1.1
> pdedecker@linux-qhij:~> ping -c 2 8.8.8.8
> PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
>
> — 8.8.8.8 ping statistics —
> 2 packets transmitted, 0 received, 100% packet loss, time 1000ms
>
> pdedecker@linux-qhij:~> ping -c 2 google.com
> ping: unknown host google.com
> pdedecker@linux-qhij:~>
> --------------------
>
>
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pdedecker · March 31, 2011, 2:53pm

Awesome, my internet connection is working again. I had seen an init warning saying that /etc/resolv.conf had been modified, but I didn’t remember when that started showing up so I assumed that some app had modified it for a legitimate reason.

Thanks!

ab · March 31, 2011, 3:30pm

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Hash: SHA1

Glad it’s working. The next step may be to find out what else modified
your /etc/resolv.conf file (not during bootup… sometime a while ago
before this all started) and then see if that can be enhanced to do it
more-intelligently. One of the comments in the default file mentions
removing that line should be done if customization occurs. That line’s
omission is what lets NetworkManager know to not touch the file which
causes your issue.

Good luck.

On 03/31/2011 07:06 AM, pdedecker wrote:
>
> Awesome, my internet connection is working again. I had seen an init
> warning saying that /etc/resolv.conf had been modified, but I didn’t
> remember when that started showing up so I assumed that some app had
> modified it for a legitimate reason.
>
> Thanks!
>
>
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