No internet every other day this week

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No internet every other day this week

Postby feodor on Fri Feb 01, 2013 8:02 am

I hope somebody will be able to help me with this problem.

I am running Mint KDE 9 (Isadora) on a triple boot desktop with Windows XP and Mint KDE 8 (that I do not use anymore). I am connected to the internet through cable at my work. This week I haven't been able to get onto the the net on Monday, Wednesday and today (Friday) using Mint. The internet works fine on the Windows part as well as from a laptop (Mint KDE 12 - Lisa). I do get a dynamic ip address and and I am using the same dns servers on the desktop and the laptop, so I am really very confused and could do with some help.

I include some of the output that helpful people usually ask for when trying to help with network issues below. It may not be very useful; output from ifconfig and contents of /etc/resolv.config and /etc/network/interfaces look similar to the output on the laptop, nslookup and ping does not (if fails on the desktop, works on the laptop). Let me know if you need anything else.

Thank you

Feodor

Code: Select all
feodor:~/>cat /etc/network/interfaces
auto lo
iface lo inet loopback

feodor:~/>ifconfig -a
eth0      Link encap:Ethernet  HWaddr 00:02:b3:88:77:5e 
          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)

eth1      Link encap:Ethernet  HWaddr 18:a9:05:eb:61:c0 
          inet addr:172.17.179.170  Bcast:172.17.191.255  Mask:255.255.192.0
          inet6 addr: fe80::1aa9:5ff:feeb:61c0/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:276298 errors:0 dropped:0 overruns:0 frame:0
          TX packets:5549 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:42126366 (42.1 MB)  TX bytes:1286356 (1.2 MB)
          Memory:f0500000-f0520000

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:5368 errors:0 dropped:0 overruns:0 frame:0
          TX packets:5368 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:437844 (437.8 KB)  TX bytes:437844 (437.8 KB)

feodor:~/>nslookup www.google.com
;; connection timed out; no servers could be reached

feodor:~/>ping 130.226.32.32
PING 130.226.32.32 (130.226.32.32) 56(84) bytes of data.
^C
--- 130.226.32.32 ping statistics ---
4 packets transmitted, 0 received, 100% packet loss, time 3024ms

feodor:~/>cat /etc/resolv.conf
# Generated by NetworkManager
nameserver 130.226.32.32
nameserver 208.67.222.222
nameserver 208.67.220.220
# NOTE: the libc resolver may not support more than 3 nameservers.
# The nameservers listed below may not be recognized.
nameserver 130.226.32.39

feodor:~/>ip route show
172.17.128.0/18 dev eth1  proto kernel  scope link  src 172.17.179.170  metric 1
169.254.0.0/16 dev eth1  scope link  metric 1000
default via 172.17.128.1 dev eth1  proto static

feodor
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Re: No internet every other day this week

Postby snison on Sat Feb 02, 2013 12:21 am

To start off with, evidently you nor I can ping your first DNS server, so that's a bad sign. You won't be able to resolve any names.

Can you ping your default gateway, 172.17.179.170?
Does your University require you to have an 802.1 certificate to access the network?

Type gufw in the menu search or at terminal. is your firewall on? Turn it off for testing.

Next try
Code: Select all
sudo ifconfig eth0 down


Now can you ping anything? If so,
Code: Select all
dig google.com @8.8.4.4
I generally don't use salutation, valedication, or please when answering your questions. I'm not a jerk; you have a question, I have a possible solution.
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Re: No internet every other day this week

Postby feodor on Wed Feb 06, 2013 7:19 am

Thank you for your answer. I have been online for the last two days without any problems. So my problem is gone for now but it has not been solved and that bugs me. It also means that there will be little use in trying the things you suggested at this point. I will keep them in mind if the problem reoccurs.

The first DNS server turns out to be my university's DNS server; it probably cannot be pinged from the outside. When I wrote, I was able to ping it from my laptop (wireless as well as cabled). I tried pinging a few ip-addresses but was not able to ping any of them from my desktop. The problem remained with OpenDNS as my first DNS server. So, I do not think the problem is a DNS problem.

Feodor
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