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Ubuntu user since 12.04, I've always found solutions to my problems here on askubuntu or elsewhere in forums or the net, but this time, after 3 weeks of patiently searching for a solution, testing my hardware in various conditions and trying other systems (e.g raspberry pi, a technician from my ISP also brought his Windrose machine - no problem with Windrose), I decided to ask my first question, because I still can't find a solution, and networking is definitely not my passion (but I'd be pleased to understand better about it).

Here is the situation.

I access to the internet from home with an ADSL, via a USB to ethernet adapter on a notebook. Countless websites I try to access can't load (ex: arduino.cc, yahoo.com, dpreview.com,...) others load normally (gmail, google, stackoverflow related websites...). This is the same for firefox and chrome.

However, if I plug in my raspberry pi with debian Jenny into my ADSL router (having obviously properly setup the connection), I can access all these websites. So this would rule out my ISP.

I also took my notebook to a place where I can access to the internet via both WiFi and ethernet (in the later case, also via the USB to ethernet adapter), and all these impossible-to-load websites can be accessed with no problem. So this would rule out my usb to ethernet adapter.

I had no problem to access these sites on ubuntu 13.10 (I've done a fresh install rather than a distribution upgrade on this machine).

So, given the detail of my system below, what could I do to be able to normally access these websites? And a side question, why does my rapsberry pi with debian can access websites while a fresh, regularly updated and upgraded 16.04 ubuntu can't (and likely requires some non obvious fiddling with network settings)?

$netstat -rn returns:

Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
0.0.0.0         168.63.38.254   0.0.0.0         UG        0 0          0 ppp0
168.63.38.254   0.0.0.0         255.255.255.255 UH        0 0          0 ppp0
169.254.0.0     0.0.0.0         255.255.0.0     U         0 0          0 ppp0

$sudo lshw -C network returns:

*-network               
       description: Wireless interface
       product: Centrino Advanced-N 6235
       vendor: Intel Corporation
       physical id: 0
       bus info: pci@0000:03:00.0
       logical name: wlp3s0
       version: 24
       serial: c4:85:08:21:f2:7d
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=iwlwifi driverversion=4.4.0-66-generic firmware=18.168.6.1 latency=0 link=no multicast=yes wireless=IEEE 802.11abgn
       resources: irq:32 memory:f7800000-f7801fff
  *-network
       description: Ethernet interface
       physical id: 1
       logical name: enx9cebe8076efa
       serial: 9c:eb:e8:07:6e:fa
       size: 100Mbit/s
       capacity: 100Mbit/s
       capabilities: ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=asix driverversion=22-Dec-2011 duplex=full firmware=ASIX AX88772 USB 2.0 Ethernet link=yes multicast=yes port=MII speed=100Mbit/s

/etc/resolv.conf:

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 127.0.1.1

ifconfig:

enx9cebe8076efa Link encap:Ethernet  HWaddr 9c:eb:e8:07:6e:fa  
          inet6 addr: fe80::1f3e:719d:994f:795a/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:52336 errors:0 dropped:0 overruns:0 frame:0
          TX packets:58855 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:15400674 (15.4 MB)  TX bytes:9900518 (9.9 MB)

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:65536  Metric:1
          RX packets:13687 errors:0 dropped:0 overruns:0 frame:0
          TX packets:13687 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1 
          RX bytes:1262209 (1.2 MB)  TX bytes:1262209 (1.2 MB)

ppp0      Link encap:Point-to-Point Protocol  
          inet addr:36.128.152.123  P-t-P:168.63.38.254  Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
          RX packets:51849 errors:0 dropped:0 overruns:0 frame:0
          TX packets:58317 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:3 
          RX bytes:14959875 (14.9 MB)  TX bytes:8358217 (8.3 MB)

And finally:

/etc/hosts:

127.0.0.1       localhost
127.0.1.1       ludo-UX32VD

# The following lines are desirable for IPv6 capable hosts
::1     ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
  • I've got similar problem. Both my notebook and desktop PC with Ubuntu 16.04 LTS installed don't show pictures on Pinterest web-site in Firefox browser as well as pictures in Thunderbird e-mail client in messages contained pictures from this site. The same devices witn Windows 10 and other devices like smartphone and tablet show pictures without problems. – Victor A. Mar 28 '17 at 14:53
  • @VictorA. if you are using ADSL, try setting up the connection with sudo pppoeconf (see my answer). Otherwise you would need to provide more information about your own case, and first try some of the solutions found on askubuntu or elsewhere. – calocedrus Mar 29 '17 at 0:15
  • Thank you for your answer. I don't use ADSL, instead I use TP-LINK WR740N v4 Router (firmware v.3.13.2 Build 140814 Rel.39331n) with all settings set to default. Actually this config allows to load pictures on Pinterest on any other device except Ubuntu-based systems. And so far this is only site I've got problems with. Found something similar but not exactly here: can't wget DeviantArt / Pinterest images but I can see images on DeviantArt. Problem is only with Pinterest. – Victor A. Mar 30 '17 at 12:25
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Well, I've eventually found a solution: do on ubuntu what I did on raspberry pi: setup my ADSL connection manually using:

sudo pppoeconf

(to be installed if not: sudo apt-get install pppoeconf)

I accepted the default and recommended options (including that of starting the connection at boot), restarted, and there's no website which can't load so far.

I however don't know how to setup the same via the network manager (eager to test the solution I didn't pay enough attention to the messages when running pppoeconf, but there was something about DNS and MSS or MTU).

But now the network manager doesn't show me any connection name, nor any of the other connection I had previously setup (e.g. direct connection to the raspberry pi, ethernet for another network...). That would be the topic of another question if I can't find the answer myself.

There's a reference about pppoeconf:

https://help.ubuntu.com/community/ADSLPPPoE

And also this informative answer that I hadn't found so far (this post didn't pop up among the dozens of Q&A related to slow internet and web site not loading):

https://askubuntu.com/a/229950/645810

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