Unable to ping on network...

**AceVenturaX** · January 12th, 2011

I have ubuntu 10.4 running on both my desktop and laptop. Both machines are connected to the router in wireless mode with Wifi.
I can access internet from both machines without any issues, however I cant ping one machine from another. (and vice versa)

I have setup static IP addresses for both machines...

Route on laptop shows :

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     2      0        0 wlan0
169.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 wlan0
0.0.0.0         192.168.1.222   0.0.0.0         UG    0      0        0 wlan0

Following is the result of pings :

Code:

zzzzzz@venture-laptop:/home/venture# ping 192.168.1.100
PING 192.168.1.100 (192.168.1.100) 56(84) bytes of data.
From 192.168.1.101 icmp_seq=1 Destination Host Unreachable
From 192.168.1.101 icmp_seq=2 Destination Host Unreachable
From 192.168.1.101 icmp_seq=3 Destination Host Unreachable
From 192.168.1.101 icmp_seq=4 Destination Host Unreachable
From 192.168.1.101 icmp_seq=5 Destination Host Unreachable
From 192.168.1.101 icmp_seq=6 Destination Host Unreachable
^C
--- 192.168.1.100 ping statistics ---
8 packets transmitted, 0 received, +6 errors, 100% packet loss, time 7039ms
, pipe 3
zzzzz@venture-laptop:/home/venture# ping 192.168.1.222
PING 192.168.1.222 (192.168.1.222) 56(84) bytes of data.
64 bytes from 192.168.1.222: icmp_seq=1 ttl=254 time=1.67 ms
64 bytes from 192.168.1.222: icmp_seq=2 ttl=254 time=1.21 ms
64 bytes from 192.168.1.222: icmp_seq=3 ttl=254 time=1.24 ms
64 bytes from 192.168.1.222: icmp_seq=4 ttl=254 time=1.03 ms
^C
--- 192.168.1.222 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3004ms
rtt min/avg/max/mdev = 1.038/1.291/1.671/0.234 ms
zzzzz@venture-laptop:/home/venture#

100 is the desktop machine and 222 is the router...
Any advise on whats going wrong here ?

**PatchesTheCaveman** · January 12th, 2011

Is your firewall configured to block ICMP/ping requests?

Try following the instructions to enable it in this help article:
https://help.ubuntu.com/community/UFW#Enable PING

**AceVenturaX** · January 13th, 2011

I do not have any firewall on the network. The built in firewall for router has also been disabled. And UFW has also been disabled. Still facing the same issue...

Code:

venture@venture-desktop:~$ sudo ufw status
Status: inactive

Any hope to get to the bottom of this ?

**AceVenturaX** · January 15th, 2011

BUMP !!!

Anybody there ???

I have lost hope and am thinking of going back to window$.

Both machines have IP , can ping the router, and access internet, are on the same network
but ABSOLUTELY refuse to ping each other.

Machine 1 NMAP

Code:

Starting Nmap 5.00 ( http://nmap.org ) at 2011-01-15 20:36 IST
Interesting ports on 192.168.1.101:
Not shown: 995 closed ports
PORT     STATE SERVICE
53/tcp   open  domain
111/tcp  open  rpcbind
139/tcp  open  netbios-ssn
445/tcp  open  microsoft-ds
2049/tcp open  nfs

Interesting ports on 192.168.1.222:
Not shown: 997 closed ports
PORT   STATE SERVICE
21/tcp open  ftp
23/tcp open  telnet
80/tcp open  http

Nmap done: 256 IP addresses (2 hosts up) scanned in 32.63 seconds

Machine 2 NMAP

Code:

Starting Nmap 5.00 ( http://nmap.org ) at 2011-01-15 20:39 IST
Interesting ports on 192.168.1.100:
Not shown: 996 closed ports
PORT     STATE SERVICE
53/tcp   open  domain
80/tcp  open  rpcbind
139/tcp  open  netbios-ssn
445/tcp  open  microsoft-ds

Interesting ports on 192.168.1.222:
Not shown: 997 closed ports
PORT   STATE SERVICE
21/tcp open  ftp
23/tcp open  telnet
80/tcp open  http

Nmap done: 256 IP addresses (2 hosts up) scanned in 32.63 seconds

ANYBODY .... any clue ???