Linux network behavior wierdness
Dave Johnson
dave-gnhlug-list at davej.org
Fri Sep 5 20:39:10 EDT 2008
Paul Lussier writes:
> Paul Lussier <p.lussier at comcast.net> writes:
>
> >> Watch out for /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts. The
> >> default was changed between 2.6.13 and 2.6.14 to ignore by default.
> >
> > Ooh, I didn't know that, thanks!
>
> Fascinating, so how does this work?
>
> $ ssh farm-519 ping -b 10.95.255.255 -c 1
> 64 bytes from 10.95.34.112: icmp_seq=1 ttl=64 time=0.074 ms
> 1 packets transmitted, 1 received, 0% packet loss, time 0ms
>
> $ ssh farm-519 cat /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts
> 1
Ping can still send, just farm-519's kernel won't reply. I'd assume
10.95.34.112 is some other host on the network that does reply right?
--
Dave
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