Network suddenly drops and comes back [Can't find in logs]

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Network suddenly drops and comes back [Can't find in logs]

Postby kashyapchhatbar on Thu Dec 12, 2013 8:02 am

Hi,

Linux Mint Version: 16 (64 bit)

I am on a big network here at work and I have been experiencing these sudden trips in network connectivity (internet and local network). The thing that is happening is that suddenly the network connectivity hangs/freezes or I do not know what happens. It comes back within 2 minutes or so or within a minute sometimes but all the open SSH connections and connectivity is gone and needs to reset. I have researched and tried to find what might be the problem and have started looking at logs {/var/log/sylog, /var/log/dmesg, /var/log/kern.log} To me, /var/log/syslog was the most obvious one but I couldn't find anything relevant from it.

I did find some thing like this whenever a trip occurs. But, the trip is not certain at that specific time but it can occur before or after that so I suspect it may be the problem. I researched it and it seems to be http://lists.freedesktop.org/archives/avahi/2012-July/002170.html

/var/log/syslog
Code: Select all
Dec 12 11:14:45 kashyap-workstation NetworkManager[1087]: <info> Activation (eth0) successful, device activated.
Dec 12 11:14:45 kashyap-workstation dbus[931]: [system] Activating service name='org.freedesktop.nm_dispatcher' (using servicehelper)
Dec 12 11:14:45 kashyap-workstation dbus[931]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
Dec 12 11:14:53 kashyap-workstation ntpdate[3922]: no server suitable for synchronization found
Dec 12 11:14:54 kashyap-workstation cinnamon-screensaver-dialog: pam_ecryptfs: seteuid error
Dec 12 11:17:01 kashyap-workstation CRON[3991]: (root) CMD (   cd / && run-parts --report /etc/cron.hourly)
Dec 12 11:25:39 kashyap-workstation avahi-daemon[1064]: Invalid response packet from host 129.215.181.186.
Dec 12 11:29:16 kashyap-workstation avahi-daemon[1064]: Invalid response packet from host 129.215.181.22.
Dec 12 11:41:29 kashyap-workstation dbus[931]: [system] Reloaded configuration
Dec 12 11:42:29  dbus[931]: last message repeated 7 times
Dec 12 11:48:45 kashyap-workstation avahi-daemon[1064]: Invalid response packet from host fe80::3e4a:92ff:fe42:3432.
Dec 12 11:48:45 kashyap-workstation avahi-daemon[1064]: Invalid response packet from host 129.215.181.80.
Dec 12 11:48:45 kashyap-workstation avahi-daemon[1064]: Invalid response packet from host 129.215.181.22.


Some additional info on other configuration files

/etc/NetworkManager/NetworkManager.conf
Code: Select all
[main]
plugins=ifupdown,keyfile,ofono
dns=dnsmasq

[ifupdown]
managed=false


/etc/network/interfaces
Code: Select all
auto lo
iface lo inet loopback


I am using IPv4 with DHCP as advised by my network admin.

I have naturally contacted my network admin and he says to check my network cable and socket. I am currently on a brand new cable and have changed two sockets on the wall which are working fine for people using Mac OS. The thing is I am one of the very few people running Linux here. I am using Linux on my laptop as well and I connect using WiFi in the same network and the network trips doesn't occur.

Any guidelines on what I am doing wrong? Why it is causing these trips? It's frustrating to work like this.

Cheers,

Kashyap
kashyapchhatbar
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