Commit 7ce31246 authored by David S. Miller's avatar David S. Miller
Browse files

[IPV4]: Update icmp sysctl docs and disable broadcast ECHO/TIMESTAMP by default

It's not a good idea to be smurf'able by default.
The few people who need this can turn it on.
Signed-off-by: default avatarDavid S. Miller <>
parent 3e56a40b
......@@ -355,10 +355,14 @@ ip_dynaddr - BOOLEAN
Default: 0
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 either is set to true, then the kernel will ignore either all
ICMP ECHO requests sent to it or just those to broadcast/multicast
addresses, respectively.
If set non-zero, then the kernel will ignore all ICMP ECHO and
TIMESTAMP requests sent to it via broadcast/multicast.
Default: 1
icmp_ratelimit - INTEGER
Limit the maximal rates for sending ICMP packets whose type matches
......@@ -188,7 +188,7 @@ struct icmp_err icmp_err_convert[] = {
/* Control parameters for ECHO replies. */
int sysctl_icmp_echo_ignore_all;
int sysctl_icmp_echo_ignore_broadcasts;
int sysctl_icmp_echo_ignore_broadcasts = 1;
/* Control parameter - ignore bogus broadcast responses? */
int sysctl_icmp_ignore_bogus_error_responses;
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