home network can't ping linux computers

stimpsonjcat · 01-08-2006, 08:48 AM

Hi
I'm trying to set up a wireless home network (nfs and printer sharing) between two Kubuntu and one XP computers. There is a wireless router which also provides interrnet access (which is working) to all of them.
Setup (all IPs static):
192.168.1.1 wireless router
192.168.1.33 Kubuntu1
192.168.1.34 winXP
192.168.1.36 Kubuntu2
all firewalls disabled.

I can ping 192.168.1.34 from both Kubuntu PCs as well as from the router.
I can ping the router from both Kubuntu PCs.
I can ping all PCs from the router.
BUT: I can't ping Kubuntu1 from Kubuntu2 and vice versa:

Code:

#ping 192.168.1.33
PING 192.168.1.33 (192.168.1.33) 56(84) bytes of data.
From 192.168.1.36 icmp_seq=1 Destination Host Unreachable

/etc/network/interfaces (both identical except for the ip):

Code:

# The loopback network interface
auto lo
iface lo inet loopback
address 127.0.0.1
netmask 255.0.0.0

# This is a list of hotpluggable network interfaces.
# They will be activated automatically by the hotplug subsystem.
mapping hotplug
        script grep
        map eth0

# The primary network interface
auto ath0
iface ath0 inet static
address 192.168.1.36
network 192.168.1.0
netmask 255.255.255.0
broadcast 192.168.1.255
gateway 192.168.1.1
pre-up /etc/init.d/wpasupplicant start
wireless-essid accesspointWPA

/etc/resolv.conf (identical):

Code:

nameserver 195.186.1.111
nameserver 195.186.4.111

route -n (identical):

Code:

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 ath0
0.0.0.0         192.168.1.1     0.0.0.0         UG    0      0        0 ath0

what's wrong?
stimpy

joshuarowley · 01-08-2006, 10:04 AM

Sorry, i offer no advice, but i would like to know how to get a Liux PC to respond to a Windows ping?

ruuster · 01-08-2006, 11:20 PM

Can you verify what you have posted? This does not make sense. If there is no filtering anywhere to explicitly deny that one Linux PC cannot ping the other Linux PC, then what you have described is not logical. The only possible explanation that I can guess at is that both Linux PCs have NICs that have the same MAC address. And, if you have not changed the MACs, this is not supposed to happen.

stimpsonjcat · 01-09-2006, 07:15 AM

Thanks for your input ruuster. I think you might be correct this is a MAC address issue:

Code:

stimpy@Kubuntu1:~$ arp -n
Address                  HWtype  HWaddress           Flags Mask            Iface
192.168.1.36                     (incomplete)                              ath0
192.168.1.1              ether   00:0F:CC:01:7A:A4   C                     ath0

Code:

stimpy@Kubuntu2:~$ arp -n
Address                  HWtype  HWaddress           Flags Mask            Iface
192.168.1.33                     (incomplete)                              ath0
192.168.1.1              ether   00:0F:CC:01:7A:A4   C                     ath0

why is the HWaddress incomplete?

joshuarowley, Windows and Linux pings are the same. If both computers are on the same network, they will respond. Having said that, I have no clue how to ping from a windows pc

. In DOS the command was

Code:

ping IP_address

(same as in Linux).

stimpsonjcat · 01-09-2006, 08:48 AM

I'm making some progress. The Kubuntu1 (192.168.1.33) box is set up as a dual boot system (Kubuntu + Debian). Just booted into Debian and everything worked as expected. arp -n showed:

Code:

Address                  HWtype  HWaddress           Flags Mask            Iface
192.168.1.36             ether   00:11:95:93:F5:12   C                     ath0
192.168.1.1              ether   00:0F:CC:01:7A:A4   C                     ath0

I don't know what to do now. It is definitely not a hardware failure.

GeoAvram · 01-09-2006, 04:07 PM

Both of the Linux PCs are connected to the wireless router?
If they are try reseting the router after both are connected!