On 26/08/14, Karl E. Jorgensen (k...@jorgensen.org.uk) wrote:
> > sysctl --system
> > * Applying /etc/sysctl.d/99-sysctl.conf ...
> > net.ipv4.icmp_echo_ignore_all = 0
> > net.ipv4.icmp_echo_ignore_broadcasts = 0
> 
> These caught my eye: Ignore all ICMP ? That would stop ping
> (a.k.a. ICMP echo) from working, wouldn't it?
 
Thanks for the suggestion, but according to 
/usr/src/linux/Documentation/networking/ip-sysctl.txt

icmp_echo_ignore_all - BOOLEAN
        If set non-zero, then the kernel will ignore all ICMP ECHO
        requests sent to it.
        Default: 0

icmp_echo_ignore_broadcasts - BOOLEAN
        If set non-zero, then the kernel will ignore all ICMP ECHO and
        TIMESTAMP requests sent to it via broadcast/multicast.
        Default: 1


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