[Arm-dev] System hung yesterday

On 02/06/2017 03:16 PM, Robert Moskowitz wrote:
> My server hung yesterday.  I did not notice it; at this stage in the 
> game, I should be much more aware...
>
> I looked into /var/log/messages and my last entry was:
>
> Feb  5 15:03:46 medon kernel: conntrack: generic helper won't handle 
> protocol 47
> . Please consider loading the specific helper module.
>
> So I don't know if someone knocked me over with a GRE based attack, if 
> the drive is bad, if the board is bad, or the OS has a problem.
>
> So simple things to start with.  I see an earlier GRE warning in 
> messages:
>
> Feb  5 03:29:49 medon kernel: conntrack: generic helper won't handle 
> protocol 47. Please consider loading the specific helper module.
>
> So it is probably not a stack problem with attacking GRE bots. BTW, is 
> there some 'easy' way to just block these?
$IPTABLES -A INPUT  -i $EXTERNAL_INTERFACE -p gre -j REJECT