Cannot ping local machines

mjk · 2010-04-20 18:29:00

Hello,
I've got a little problem - although I can ping my router and google too, i can't ping nor be pinged by other two machines on my lan, both running windows. I have no idea what can be wrong, nor have found anything useful. A few weeks ago everything was ok.

Could you please help me or give me any directions? Thanks in advance!

skazhy · 2010-04-20 19:29:26

if all machines have static IPs, check if gateway / subnet mask is the same.

mjk · 2010-04-20 19:43:15

Yes, they do have static ips and gateway is set to 10.0.0.138 (router) and subnet mask to 255.255.255.0 on all of them.

I forgot to mention that the windows machines are able to ping each other...

Last edited by mjk (2010-04-20 19:44:36)

fukawi2 · 2010-04-20 22:40:25

Are you pinging via hostname or IP address?

mjk · 2010-04-21 14:53:08

via IP address

now I see I haven't even inserted the error message

$  ping 10.0.0.6
PING 10.0.0.6 (10.0.0.6) 56(84) bytes of data.
From 10.0.0.4 icmp_seq=1 Destination Host Unreachable
From 10.0.0.4 icmp_seq=2 Destination Host Unreachable
From 10.0.0.4 icmp_seq=3 Destination Host Unreachable
^C
--- 10.0.0.6 ping statistics ---
8 packets transmitted, 0 received, +6 errors, 100% packet loss, time 7020ms
pipe 3

Last edited by mjk (2010-04-21 15:15:10)

ewaller · 2010-04-21 15:15:50

Are you wired or wireless?
It is not required, but what happens if you set your nic to promiscuous mode?
Anything interesting in the router? Is your address by any chance configured as a DMZ?
Try Wireshark or tcpdump and see what, if any, packets are actually on the LAN.
What is the output of 'routes'?

Last edited by ewaller (2010-04-21 15:16:43)

ewaller · 2010-04-21 15:28:02

Also,

gateway is set to 10.0.0.138 (router) and subnet mask to 255.255.255.0

*.*.*.138 is an odd place for a router.
Also, you are configured as a class A private network (10.*.*.*) Are you sure the subnet mask should be 255.255.255.0?

I thought is should be 255.0.0.0, but I could be wrong.

mjk · 2010-04-21 15:46:19

At the moment wired, tried both.
As i understood it, it's not configured as DMZ.
Setting NIC to promiscuous mode changes nothing.
The output of route is

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
10.0.0.0        *               255.255.255.0   U     0      0        0 eth0
default           viking          0.0.0.0         UG    0      0        0 eth0

mjk · 2010-04-21 15:53:37

ewaller wrote:

Also,
gateway is set to 10.0.0.138 (router) and subnet mask to 255.255.255.0
*.*.*.138 is an odd place for a router.
Also, you are configured as a class A private network (10.*.*.*) Are you sure the subnet mask should be 255.255.255.0?
I thought is should be 255.0.0.0, but I could be wrong.

You could be right, i don't know. The IP is the default setting, I might changed the subnet mask, but if, then very long time ago.

ewaller · 2010-04-21 16:01:49

where is 'viking' defined -- can you verify it is set to 10.0.0.138?

(You can tell routes to give the answers in IP address format. Unfortunately, I'm in front of a windows machine and my ssl link to my Linux box is down, so i cannot verify the command format)

mjk · 2010-04-21 16:12:56

ewaller wrote:

where is 'viking' defined -- can you verify it is set to 10.0.0.138?
(You can tell routes to give the answers in IP address format. Unfortunately, I'm in front of a windows machine and my ssl link to my Linux box is down, so i cannot verify the command format)

# /etc/hosts: static lookup table for host names
#

#<ip-address>   <hostname.domain.org>   <hostname>
127.0.0.1               localhost.localdomain   localhost eddie
10.0.0.138                                      viking

mjk · 2010-04-21 17:15:27

when i run ping, tcpdump shows this:

...
19:09:18.470654 ARP, Request who-has 10.0.0.6 tell 10.0.0.4, length 28
19:09:19.469847 ARP, Request who-has 10.0.0.6 tell 10.0.0.4, length 28
19:09:20.486487 ARP, Request who-has 10.0.0.6 tell 10.0.0.4, length 28
19:09:21.486486 ARP, Request who-has 10.0.0.6 tell 10.0.0.4, length 28
...

mjk · 2010-04-23 09:13:38

After lots of trying I suddenly discovered that when both arch and windows box use wireless connection, they can ping each other (I'm pretty sure they couldn't in the beginning), but still can't when at least one of them uses wired connection. Does anyone know what it could mean?

Arch Linux

#1 2010-04-20 18:29:00

Cannot ping local machines

#2 2010-04-20 19:29:26

Re: Cannot ping local machines

#3 2010-04-20 19:43:15

Re: Cannot ping local machines

#4 2010-04-20 22:40:25

Re: Cannot ping local machines

#5 2010-04-21 14:53:08

Re: Cannot ping local machines

#6 2010-04-21 15:15:50

Re: Cannot ping local machines

#7 2010-04-21 15:28:02

Re: Cannot ping local machines

#8 2010-04-21 15:46:19

Re: Cannot ping local machines

#9 2010-04-21 15:53:37

Re: Cannot ping local machines

#10 2010-04-21 16:01:49

Re: Cannot ping local machines

#11 2010-04-21 16:12:56

Re: Cannot ping local machines

#12 2010-04-21 17:15:27

Re: Cannot ping local machines

#13 2010-04-23 09:13:38

Re: Cannot ping local machines

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