Losing network connectivity - Is there a virus on my system ?

Matthew Seaman m.seaman at infracaninophile.co.uk
Mon Jul 25 17:13:33 UTC 2016

On 2016/07/25 17:54, Manish Jain wrote:
> I am using FreeBSD 10.2 amd64, with Win XP as a backup OS. Since 
> yesterday, I am experiencing a strange situation. Internet connectivity is 
> lost every 10-15 minutes. 'ping www.freebsd.org' starts reporting 100% 
> packet loss. If I run 'service netif restart', ping reports "No route to 
> host".

Try mtr instead of ping (in ports) -- it shows you /where/ the packets
are being lost.  'netstat -i' is also a good thing to check.  If there
are any packet errors, particularly if they are going up over time, then
there's a physical problem somewhere on your local network.  Frequently
this is due to bad ethernet cables, but it could be some more expensive
bit of hardware going wonky.

Also, you need to do:

   service netif restart && service routing restart

to completely refresh your network interfaces.  Not restarting the
routing explains at least part of what you're seeing.

This sort of problem is almost never down to malfeasance -- the black
hats would typically rather have control over your fully working
hardware and will frequently try and avoid doing anything that would
lead to being discovered.   Most likely it's a software configuration
problem, or failing that, hardware failure.



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