No internet every other day this week

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feodor
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Posts: 31
Joined: Fri Mar 26, 2010 7:45 am

No internet every other day this week

Post by feodor »

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

Last edited by LockBot on Wed Dec 28, 2022 7:16 am, edited 1 time in total.
Reason: Topic automatically closed 6 months after creation. New replies are no longer allowed.
snison

Re: No internet every other day this week

Post by snison »

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
feodor
Level 1
Level 1
Posts: 31
Joined: Fri Mar 26, 2010 7:45 am

Re: No internet every other day this week

Post by feodor »

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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