Cannot ping my ubuntu PC

[rzammit]

--------------------------------------------------------------------------------

Hi all!
I am new here also new to ubuntu so if the following might sound stupid pls bear with me :P

I have setup a PC with two network cards and installed ubuntu 8.04, and also another PC with XP SP2 with also two network cards. The setup is more or less like this:

PRIVATE IP No.1 -------- UBUNTU PC -------- PRIVATE IP -- NETWORK
|
| < cross over cable
|
PRIVATE IP No.1 -------- XP SP2 PC -------- PRIVATE IP -- NETWORK

I can ping FROM the ubuntu to the XP but CANNOT from the xp to the ubuntu.....

can you pls help??? Thanks!!

[kostasan]

It must have something to do with the gateways. Try putting the IP of the Ubuntu PC as gateway in the Windows machine.

[rzammit]

not really as the gateway on the window xp machine is the ubuntu ip and vice versa....

[kostasan]

Have you made any changes to iptables in Ubuntu or have installed a firewall that is configured not to allow being pinged?

[rzammit]

I have installed :


all updates to date
dansguardian
firehol
tinyproxy


as i said i am a newbie....how can i know if firewall is enabled??

[jayd512]

You should be able to check the status of your firewall from the terminal. Execute

service iptables status

Then you should look into some info on iptables. I'll see if I can come up with a link for you...

[rzammit]

I be be grateful.

Thanks!

[jayd512]

I found a couple of things that may help you out:

Iptables - Wikipedia, the free encyclopedia

IPTAbles Explained, get started with IPTables and tame the monster of all firewalls

Good luck!

[rzammit]

Sorry for asking too much

What exactly are IP tables? is it like a routing table?

What should I look for if the IPs are correct (since I can ping from the ubuntu pc to the xp one) ?

[kostasan]

Iptables is THE Linux firewall. Firehol is "an iptables stateful packet filtering firewall builder for Linux", as it is mentioned on its site. This means that firehol lets you configure iptables in an easier way. So you must edit the configuration file.
sudo gedit /etc/firehol/firehol.conf
There you must have something like server "ping" accept
See this link for more help Setting Up An Iptables Firewall On Ubuntu With Firehol | HowtoForge - Linux Howtos and Tutorials
Since you are a new user, i suggest you uninstall firehol and install firestarter, which has a gui and is easier to use.
sudo apt-get remove firehol
sudo apt-get install firestarter