No network broadcast address

[leigh123linux]

There should be three ip's listed but the fedora boxes fail to respond.
Can anyone help

[root@localhost leigh]# ping -b 192.168.1.0
WARNING: pinging broadcast address
PING 192.168.1.0 (192.168.1.0) 56(84) bytes of data.
64 bytes from 192.168.1.5: icmp_req=1 ttl=64 time=1.91 ms
64 bytes from 192.168.1.5: icmp_req=2 ttl=64 time=0.298 ms
64 bytes from 192.168.1.5: icmp_req=3 ttl=64 time=0.280 ms
64 bytes from 192.168.1.5: icmp_req=4 ttl=64 time=0.309 ms
^C
--- 192.168.1.0 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3001ms
rtt min/avg/max/mdev = 0.280/0.700/1.914/0.701 ms
[root@localhost leigh]# ping -b 192.168.1.255
WARNING: pinging broadcast address
PING 192.168.1.255 (192.168.1.255) 56(84) bytes of data.
64 bytes from 192.168.1.5: icmp_req=1 ttl=64 time=0.329 ms
64 bytes from 192.168.1.5: icmp_req=2 ttl=64 time=0.277 ms
64 bytes from 192.168.1.5: icmp_req=3 ttl=64 time=0.305 ms
64 bytes from 192.168.1.5: icmp_req=4 ttl=64 time=0.278 ms
64 bytes from 192.168.1.5: icmp_req=5 ttl=64 time=0.285 ms

All three machines are connected to my 3Com router by Lan and the fedora firewalls are disabled.

[assen]

Hi,

If the BRODCAST flag up on the physical interface of the box(es) which did not respond(check with ifconfig)?

Do the non-responding boxes actually get the broadcast echo-request (a.k.a. is 3Com playing too smart)? tcpdump will help here. Also, do they send an echo-reply?

WWell,

---------- Post added at 10:47 PM GMT ---------- Previous post was at 10:44 PM GMT ----------

Hi again,

Forgot the most obvious - on targets,

echo "0" > cat /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts

WWell,

[leigh123linux]

Originally Posted by assen

Hi,

If the BRODCAST flag up on the physical interface of the box(es) which did not respond(check with ifconfig)?

Do the non-responding boxes actually get the broadcast echo-request (a.k.a. is 3Com playing too smart)? tcpdump will help here. Also, do they send an echo-reply?

WWell,

---------- Post added at 10:47 PM GMT ---------- Previous post was at 10:44 PM GMT ----------

Hi again,

Forgot the most obvious - on targets,

echo "0" > cat /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts

WWell,

Thank you, adding

echo "0" > /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts

To /etc/rc.d/rc.local fixed the issue.

[root@localhost ~]# ping -b 192.168.1.0
WARNING: pinging broadcast address
PING 192.168.1.0 (192.168.1.0) 56(84) bytes of data.
64 bytes from 192.168.1.2: icmp_req=1 ttl=64 time=0.078 ms
64 bytes from 192.168.1.5: icmp_req=1 ttl=64 time=1.65 ms (DUP!)
64 bytes from 192.168.1.3: icmp_req=1 ttl=64 time=4.23 ms (DUP!)
64 bytes from 192.168.1.2: icmp_req=2 ttl=64 time=0.033 ms
64 bytes from 192.168.1.5: icmp_req=2 ttl=64 time=0.286 ms (DUP!)
64 bytes from 192.168.1.3: icmp_req=2 ttl=64 time=1.26 ms (DUP!)
64 bytes from 192.168.1.2: icmp_req=3 ttl=64 time=0.038 ms
64 bytes from 192.168.1.5: icmp_req=3 ttl=64 time=0.293 ms (DUP!)
64 bytes from 192.168.1.3: icmp_req=3 ttl=64 time=1.49 ms (DUP!)
64 bytes from 192.168.1.2: icmp_req=4 ttl=64 time=0.057 ms
64 bytes from 192.168.1.5: icmp_req=4 ttl=64 time=0.318 ms (DUP!)
64 bytes from 192.168.1.3: icmp_req=4 ttl=64 time=1.14 ms (DUP!)
64 bytes from 192.168.1.2: icmp_req=5 ttl=64 time=0.062 ms
64 bytes from 192.168.1.5: icmp_req=5 ttl=64 time=0.315 ms (DUP!)
64 bytes from 192.168.1.3: icmp_req=5 ttl=64 time=1.34 ms (DUP!)