Can't ping server

[AmbiguousOutlier]

Hello, what are some obvious reasons why I can't ping my server, yet I can still access all my NFS shares on it and the server can ping my other machines just fine?

rhys@orange:~$ ping tomato
PING tomato.default (192.168.1.72) 56(84) bytes of data.
^C
--- tomato.default ping statistics ---
4 packets transmitted, 0 received, 100% packet loss, time 2999ms

[jonedney]

Hi RhysGM,

Have you placed an exception in IPTABLES/firewall to allow orange to connect to tomato?

[AmbiguousOutlier]

Nothing is in iptables and I disabled ufw.

orange = laptop wlan
tomato = server lan
mango = xbmc lan

I can't ssh into tomato from orange or ping however I can ssh orange into mango then from mango I can ssh and ping tomato. When I've tunnelled into tomato from orange via mango, I can ping back to orange.

I just can't figure out what I've done to prevent orange from seeing tomato?!

EDIT:

And if it makes a difference, I have to specify the private IP and not the computer name to ssh from mango to tomato.

[darkod]

Is the dns resolving correct? Is tomato IP really .72?

[AmbiguousOutlier]

It looks correct to me,

rhys@Tomato:~$ ifconfig
eth0      Link encap:Ethernet  HWaddr 00:1f:d0:d9:b2:c5  
          inet addr:192.168.1.72  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::21f:d0ff:fed9:b2c5/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:4503012 errors:0 dropped:0 overruns:0 frame:0
          TX packets:5944157 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:3661397857 (3.6 GB)  TX bytes:6665486100 (6.6 GB)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:3338 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3338 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:260429 (260.4 KB)  TX bytes:260429 (260.4 KB)

[darkod]

Are you sure there is no firewall active?

Did you try pinging the name, and also pinging the IP .72?

[AmbiguousOutlier]

Yeah, I've double checked all that.

rhys@Tomato:~$ sudo ufw status verbose
Status: inactive

rhys@orange:~$ ping 192.168.1.72
PING 192.168.1.72 (192.168.1.72) 56(84) bytes of data.
^C
--- 192.168.1.72 ping statistics ---
6 packets transmitted, 0 received, 100% packet loss, time 5038ms

rhys@orange:~$ ssh 'rhys@mango'
rhys@mango's password: 
Welcome to Ubuntu 12.10 - XBMCbuntu (GNU/Linux 3.5.0-22-generic i686)

 * Documentation:  https://help.ubuntu.com/

Last login: Tue May 21 19:21:58 2013 from tomato.local
rhys@Mango:~$ ping tomato
PING tomato (67.215.65.132) 56(84) bytes of data.
64 bytes from hit-nxdomain.opendns.com (67.215.65.132): icmp_req=1 ttl=51 time=36.0 ms
64 bytes from hit-nxdomain.opendns.com (67.215.65.132): icmp_req=2 ttl=51 time=33.4 ms
64 bytes from hit-nxdomain.opendns.com (67.215.65.132): icmp_req=3 ttl=51 time=30.3 ms
64 bytes from hit-nxdomain.opendns.com (67.215.65.132): icmp_req=4 ttl=51 time=12.3 ms
^C
--- tomato ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3004ms
rtt min/avg/max/mdev = 12.325/28.040/36.005/9.292 ms

[darkod]

Did you notice that when pinging from orange to tomato it tries it on the private IP and when pinging from mango to tomato it does it on a public IP? So, pinging from mango works but on a public IP, not on private IP.

Also, in some cases having ufw inactive doesn't mean much. Can you post this from tomato:

sudo iptables -L -n -v

[AmbiguousOutlier]

I did not spot that. If I use the private IP then mango doesn't reslove it.

rhys@Mango:~$ ping 192.168.1.72
PING 192.168.1.72 (192.168.1.72) 56(84) bytes of data.
^C
--- 192.168.1.72 ping statistics ---
7 packets transmitted, 0 received, 100% packet loss, time 6047ms

rhys@Tomato:~$ sudo iptables -L -n -v
Chain INPUT (policy ACCEPT 13M packets, 11G bytes)
 pkts bytes target     prot opt in     out     source               destination         
    0     0 fail2ban-ssh  tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            multiport dports 22

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination         

Chain OUTPUT (policy ACCEPT 15M packets, 15G bytes)
 pkts bytes target     prot opt in     out     source               destination         

Chain fail2ban-ssh (1 references)
 pkts bytes target     prot opt in     out     source               destination         
    0     0 RETURN     all  --  *      *       0.0.0.0/0            0.0.0.0/0

EDIT:

sudo nano /etc/network/interfaces

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet static
        address 192.168.1.72
        netmask 255.255.255.0
        broadcast 192.168.1.255
        gateway 192.168.1.1

[darkod]

iptables is OK, you have the policies as ACCEPT.

But ping and ssh seems to work only on the public IP. Try ssh-ing with username@192.168.1.72 instead of username@tomato, from both mango and orange. I think it won't work.