broadcast ping

Marc Martinez lastxit@technogeeks.org
Wed, 20 Sep 2000 12:01:55 -0700


On Wed, Sep 20, 2000 at 01:53:45PM +0200, Mariusz Woloszyn wrote:
> 
> When I ping broadcast address from my LAN (192.168.0.255) 2.4 linux box
> does NOT response and more if I ping bradcast addr from this box it does
> NOT recognises response (I examined it with tcpdump on another computer).
> Interface is configured properly (without netfilter stuff all works
> well!).
> 
> Could you help me find which component results in such behavior?

this likely has nothign to do with netfilter in particular, double check the
run-time behaviour of the kernel by doing a:

cat /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts

if it prints out a "1" (which I *think* is default now but I've had it set
that way via systune for so long I don't recall) then you'll certainly not
get any broadcast traffic through.. echo a "0" into that file and things
should work as you expect.

Marc