I purged network manager from my system (OS: Linux 3.13.0-53-generic #89-Ubuntu)
Networking service runs on my system:
sudo service networking status networking start/running
Static interface info:
iface eth0 inet static address 100.100.100.216 netmask 255.255.255.0 broadcast 100.100.100.255 gateway 100.100.100.1 dns-nameservers 188.8.131.52 dns-search google.com
Problem: Internet connection disconnects randomly.
I have another windows machine on my LAN that works, when network is not connected on Linux. So, no problem with router
Try to ping gateway
ping 100.100.100.1 PING 100.100.100.1 (100.100.100.1) 56(84) bytes of data. From 100.100.100.112 icmp_seq=1 Destination Host Unreachable
So, to test this random behaviour I assumed the network traffic might be causing the random behaviour.
So, I did set one of the shell to infinitely ping Google server. After a while as expected I got the following message
ping: sendmsg: No buffer space available
After some time, the network starts working again.
On one of the link it says to increase the size of the buffer (www.cyberciti.biz/faq/linux-tcp-tuning). So I did, and my current proc/sys/net/core/wmem_max size is 83886080
Still, if I do infinite ping again network fails the same way.
Question: Which process/service is causing the network buffer reset? Also, why is it taking so much time to do so?
As a temporary fix, manually unplug-plug Ethernet or do ifdown eth0 && ifup eth0 [But, this is not a correct solution]