How do I make my computer "unpingable"?

[gubar]

Hi,

I've recently done an on-line security test. Everything was ok apart from one flag, that I can be "pinged". It advised me to sort this out though didn't advise how.

I use comodo as a firewall, and have a bebox router.

Any help appreciated,

thanks,

gubar

 

[kritius]

Where did you do the test?

EDIT\\\

Go to
-Control Panel
-Network Connections
-With the right mouse button choose Properties from Local Area Connection
-Choose the Advanced Tab
-Choose Settings...
-Choose the Advanced Tab
-Choose Settings... for ICMP
-deactivate Allow incoming echo request

Should work.

 

[gubar]

Where did you do the test?

Hi,

it was at grc.com.

gubar

 

[kritius]

see above post.

 

[gubar]

Thanks again for that,

however I have tried, and still get the same results.

On top of that, it seems that I have ports 21 (ftp), 23 (telnet) and 443 open. All others are ok.

In my bebox settings, it says that the firewall is disabled but that intrusion prevention is on. I can't see a setting that allows the firewall to be switched on.

Is there any way to make this completely secure? If there's any more info I can give just let me know.

thanks,

gubar

 

[kritius]

i would have thought that the comodo firewall would do just fine, I have the firewall in my router turned off and use comodo and ive never had had any problems.

Is there an advanced setting when you go into the options on your router? Maybe called application sharing? If there is you may be able to close those ports, although before doing this I would maybe do some research or contact my ISP and find out if they are open for a certain reason.

 

[DelJo63]

GRC.COM ping + stealth testing

there are several 'entry points' to a network and each of them have different settings
and therefore different results; consider:

modem-----[a]Router[b]------[c]system

At point [a] is your public IP address. the settings in the router will control the reply to
any ping from the internet.
At point is your LAN router address (typically 192.168.x.x) and you want it to be pingable
from all systems attached to that router. Typically, this address does not have a ping-control
in the router anyway
At point [c] is your system(s). Ping control here is provided by your firewall settings.

While an external site like grc.com will always see your public ip address, it can not
discover your router address nor the system(s) addresses UNLESS you allow a
download to test from within your system (some sites will do this)

Ports open vs stealth mode;
Again, your firewall is in control here. UNLESS you have an FTPD server running,
inbound unsolicited connections to port 20,21 should be blocked. The same is true
for Telnet -- no inbound connections to port 23.

When/if you use Telnet, it will open an outbound connection and talk across it
even though the inbound is denyed

For FTP, same idea, just be sure to issue the PASIVE command after you connect.

Open port 443??
Likely this is due to the manner of performing the test, as this is a contraticion in usage.
Port 443 is the browser secured SSL port and it is created by an outbound connection.
Traffic will flow in both directions, but never the inbound half first.

edit:
www.grc.com/

click Proceed
then click File Sharing; you SHOULD see

Please Stand By. . .

Attempting connection to your computer. . .
Shields UP! is now attempting to contact the Hidden Internet Server within your PC. ..

Your Internet port 139 does not appear to exist!
One or more ports on this system are operating in FULL STEALTH MODE! ....


Unable to connect with NetBIOS to your computer.
All attempts to get any information from your computer have FAILED.​

when complete click Common Ports; you SHOULD see

Your system has achieved a perfect "TruStealth" rating. Not a single packet — solicited or otherwise —
was received from your system as a result of our security probing tests.

Port
Service
Status Security Implications

0
<nil>
Stealth There is NO EVIDENCE WHATSOEVER that a port (or even any computer) exists at this IP address!

21
FTP
Stealth There is NO EVIDENCE WHATSOEVER that a port (or even any computer) exists at this IP address!

22
SSH
Stealth There is NO EVIDENCE WHATSOEVER that a port (or even any computer) exists at this IP address!

23
Telnet
Stealth There is NO EVIDENCE WHATSOEVER that a port (or even any computer) exists at this IP address!

25
SMTP
Stealth There is NO EVIDENCE WHATSOEVER that a port (or even any computer) exists at this IP address!

79
Finger
Stealth There is NO EVIDENCE WHATSOEVER that a port (or even any computer) exists at this IP address!

80
HTTP
Stealth There is NO EVIDENCE WHATSOEVER that a port (or even any computer) exists at this IP address!

110
POP3
Stealth There is NO EVIDENCE WHATSOEVER that a port (or even any computer) exists at this IP address!

113
IDENT
Stealth There is NO EVIDENCE WHATSOEVER that a port (or even any computer) exists at this IP address!

119
NNTP
Stealth There is NO EVIDENCE WHATSOEVER that a port (or even any computer) exists at this IP address!

135
RPC
Stealth There is NO EVIDENCE WHATSOEVER that a port (or even any computer) exists at this IP address!

139
Net
BIOS
Stealth There is NO EVIDENCE WHATSOEVER that a port (or even any computer) exists at this IP address!

143
IMAP
Stealth There is NO EVIDENCE WHATSOEVER that a port (or even any computer) exists at this IP address!

389
LDAP
Stealth There is NO EVIDENCE WHATSOEVER that a port (or even any computer) exists at this IP address!

443
HTTPS
Stealth There is NO EVIDENCE WHATSOEVER that a port (or even any computer) exists at this IP address!

445
MSFT
DS
Stealth There is NO EVIDENCE WHATSOEVER that a port (or even any computer) exists at this IP address!

1002
ms-ils
Stealth There is NO EVIDENCE WHATSOEVER that a port (or even any computer) exists at this IP address!

1024
DCOM
Stealth There is NO EVIDENCE WHATSOEVER that a port (or even any computer) exists at this IP address!

1025
Host
Stealth There is NO EVIDENCE WHATSOEVER that a port (or even any computer) exists at this IP address!

1026
Host
Stealth There is NO EVIDENCE WHATSOEVER that a port (or even any computer) exists at this IP address!

1027
Host
Stealth There is NO EVIDENCE WHATSOEVER that a port (or even any computer) exists at this IP address!

1028
Host
Stealth There is NO EVIDENCE WHATSOEVER that a port (or even any computer) exists at this IP address!

1029
Host
Stealth There is NO EVIDENCE WHATSOEVER that a port (or even any computer) exists at this IP address!

1030
Host
Stealth There is NO EVIDENCE WHATSOEVER that a port (or even any computer) exists at this IP address!

1720
H.323
Stealth There is NO EVIDENCE WHATSOEVER that a port (or even any computer) exists at this IP address!

5000
UPnP
Stealth There is NO EVIDENCE WHATSOEVER that a port (or even any computer) exists at this IP address!​

edit/

 

[Nodsu]

If you have a router, then all these online tests show what is open and allowed on your router. The firewall on your PC is secondary.

Most routers have an option to disable ping. It may be called something very obscure, so you should see your router manual about this.

These open ports may be forwarded on your router or the router itself may be accepting connections via these for remote management. Disable all management features of your router that allow access from the internet side. Again, see the manual about this.

 

[gubar]

To everyone who's chipped in here - a big thank you.

I done some googling about my modem settings, and it was indeed them. I've changed it appropriately and now all seems to be secure.

thanks again,

gubar