Hey, sorry it took a while to reproduce (it doesn't happen all the time)
Indeed my computer is at that IP address, and I don't see anything suspicious
on netstat (though I'm not entirely sure what I'm looking for)
running ```sudo systemctl restart network-manager``` fixes the problem
temporarily, so I don't have a real issue anymore (I don't really mind running
that every once in a while)
Still, this seems to be a problem with nixos' networkmanager, so probably a
real fix should be found, no?
netstat output reproduced below (the last part of it may have been after the
networkmanager restart):
```
➜ ~ sudo netstat --all --udp -4 --program
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
udp 0 0 192.168.0.19:45871 209.18.47.61:domain ESTABLISHED 23086/nscd
udp 0 0 192.168.0.19:54065 209.18.47.61:domain ESTABLISHED 23086/nscd
udp 0 0 192.168.0.19:45917 209.18.47.61:domain ESTABLISHED 11093/astroid
udp 0 0 192.168.0.19:38207 209.18.47.61:domain ESTABLISHED 11093/astroid
udp 0 0 192.168.0.19:54745 209.18.47.62:domain ESTABLISHED 1071/xmobar
udp 0 0 192.168.0.19:54887 209.18.47.62:domain ESTABLISHED 11093/astroid
udp 0 0 192.168.0.19:47019 209.18.47.62:domain ESTABLISHED 23086/nscd
udp 0 0 192.168.0.19:47614 209.18.47.62:domain ESTABLISHED 23086/nscd
udp 0 0 192.168.0.19:39696 209.18.47.61:domain ESTABLISHED 11093/astroid
udp 0 0 192.168.0.19:56471 209.18.47.61:domain ESTABLISHED 23086/nscd
udp 0 0 *:bootpc *:* 23027/dhclient
udp 0 0 192.168.0.19:ntp *:* 589/ntpd
udp 0 0 localhost:ntp *:* 589/ntpd
udp 0 0 *:ntp *:* 589/ntpd
udp 0 0 *:49433 *:* 16773/firefox
udp 0 0 192.168.0.19:49798 209.18.47.62:domain ESTABLISHED 23086/nscd
udp 0 0 192.168.0.19:33435 209.18.47.61:domain ESTABLISHED 15350/skype
udp 0 0 192.168.0.19:49922 209.18.47.61:domain ESTABLISHED 23086/nscd
udp 0 0 192.168.0.19:41809 209.18.47.61:domain ESTABLISHED 1071/xmobar
udp 0 0 192.168.0.19:58523 209.18.47.62:domain ESTABLISHED 11093/astroid
udp 0 0 192.168.0.19:58695 209.18.47.62:domain ESTABLISHED 11093/astroid
udp 0 0 192.168.0.19:50588 209.18.47.62:domain ESTABLISHED 11093/astroid
udp 0 0 192.168.0.19:58926 209.18.47.62:domain ESTABLISHED 23086/nscd
udp 0 0 192.168.0.19:35389 209.18.47.62:domain ESTABLISHED 23086/nscd
udp 0 0 192.168.0.19:35431 209.18.47.61:domain ESTABLISHED 23086/nscd
udp 0 0 *:52443 *:* 23027/dhclient
udp 0 0 192.168.0.19:52585 209.18.47.62:domain ESTABLISHED 11093/astroid
udp 0 0 localhost:52851 *:* 15350/skype
udp 0 0 192.168.0.19:36500 209.18.47.61:domain ESTABLISHED 15350/skype
udp 0 0 *:28501 *:* 15350/skype
```
Excerpts from Pavel Chuprikov's message of September 27, 2016 9:11 am:
Hi,
Am I correct, that your computer's IP is 192.168.0.19 (you can check it
with *ip addr*)? It doesn't seems so, since there are no ARP replies from
(presumably) your router.
If it is, then for starters I would suggest to find the guy who sends UDP
broadcast on port 75. To do this you can use *netstat* and check for any
suspicious activity*:*
*# sudo netstat --all --udp -4 --program*
Also, check that your computer doesn't run dhcp server, that could misguide
other clients.
At home you can try to run wireshark to find out what happens with HTTP
requests or you better follow some basic network troubleshooting guides
like this <https://ubuntuforums.org/showthread.php?t=25557> one or this
<http://searchnetworking.techtarget.com/tip/Wireless-network-troubleshooting-Connectivity>
one, or, maybe, this
<http://www.linuxhomenetworking.com/wiki/index.php/Quick_HOWTO_:_Ch04_:_Simple_Network_Troubleshooting#.V-pukXV95vA>
one.
--
Pavel
вт, 27 сент. 2016 г. в 10:05, Taeer Bar-Yam <[email protected]>:
Okay, I got wireshark. I ran it (with sudo) and hit analyze on the wifi
network. I've attached a screenshot of the results. There are definitely
some fishy things going on. Let me know if you need other diagnostic
information. Sorry, I've never done much with network connections before.
Thanks for the help!
--Taeer
Excerpts from Tomasz Czyż's message of September 23, 2016 11:51 am:
> whireshark is your friend
>
> 2016-09-23 16:46 GMT+01:00 Taeer Bar-Yam <[email protected]>:
>
>> It *seems* as though my computer is breaking the internet for other
>> people. Sometimes at home the internet cuts out (not the wifi, that
still
>> connects; but webpages do not load on anyone's computers). This also
>> happens at my friend's house, but not the on-campus wifi network. It
>> appears to only happen when I am there and try to connect to the
internet,
>> but it doesn't always happen when I try to connect to the internet.
>>
>> Is it possible that my computer is responsible? What would be causing
that?
>>
>> I am using NixOS 16.03 stable and my internet setup is:
>> ```
>> networking.hostName = "rebel";
>> networking.networkmanager.enable = true;
>> ```
>> and I'm using ```nmtui connect``` to connect to the wifi network
>>
>> let me know if there's any other relevant information I should send.
>>
>> --Taeer
>> _______________________________________________
>> nix-dev mailing list
>> [email protected]
>> http://lists.science.uu.nl/mailman/listinfo/nix-dev
>>
>
>
>
> --
> Tomasz Czyż
>
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--Taeer
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