Why can't I ping this modem? [solved]

Black Panther · Jul 30, 2012, 05:00 PM

I know it's working and that I have the correct IP address because I'm viewing cctv over the net through it.

But when I ping the IP it says request timed out.

Zebeon · Jul 30, 2012, 05:09 PM

Could you ping it before? Are you talking your local dsl modem?

Also, firewall, disabled icmp?

more info please

Static~Charge · Jul 30, 2012, 05:12 PM

Perhaps the modem is configured not to respond to pings.

xytras · Jul 30, 2012, 05:14 PM

Do you see it via arp -a ???

Wrigleyvillain · Jul 30, 2012, 05:40 PM

Yeah ICMP ("ping") can be disabled/blocked. Another security-though-obscurity method.

Black Panther · Jul 30, 2012, 05:59 PM

Quote:

Originally Posted by Zebeon

Could you ping it before? Are you talking your local dsl modem?

Also, firewall, disabled icmp?

more info please

No. I remember not being able to ping it ever.
It's a cable modem/router in one, not the one I use at home but in another place (account's in my name).
I never changed any settings, it's all on default settings.

Quote:

Originally Posted by Static~Charge

Perhaps the modem is configured not to respond to pings.

Might be.

Quote:

Originally Posted by xytras

Do you see it via arp -a ???

What's the exact command I should use?

Quote:

Originally Posted by Wrigleyvillain

Yeah ICMP ("ping") can be disabled/blocked. Another security-though-obscurity method.

Makes sense. So it was like that by default? I never tried to block it.

xytras · Jul 30, 2012, 06:01 PM

Quote:

Originally Posted by Black Panther

No. I remember not being able to ping it ever.
It's a cable modem/router in one, not the one I use at home but in another place (account's in my name).
I never changed any settings, it's all on default settings.

Might be.

What's the exact command I should use?

Makes sense. So it was like that by default? I never tried to block it.

arp -a

Wrigleyvillain · Jul 30, 2012, 06:20 PM

Yeah by default most likely.

Black Panther · Jul 30, 2012, 06:26 PM

Quote:

Originally Posted by xytras

arp -a

This modem isn't the one I'm currently using right now.
It's at another place 30km away.

xytras · Jul 30, 2012, 06:28 PM

Quote:

Originally Posted by Black Panther

This modem isn't the one I'm currently using right now.
It's at another place.

This will should show all connected devices on the network segment "aka switch/router". You would run this command on a windows box that is connected to the same switch as the CCTV device.

Black Panther · Aug 2, 2012, 09:58 AM

Quote:

Originally Posted by Wrigleyvillain

Yeah ICMP ("ping") can be disabled/blocked. Another security-though-obscurity method.

Is it possible to unblock?

I need to have this modem ping-able because I need to periodically check the cctv there.

Or is there any other way I could check whether the modem is online or not?

Aquinus · Aug 2, 2012, 12:41 PM

Quote:

Originally Posted by Black Panther

Is it possible to unblock?

The modem usually doesn't block anything, it's the router that the modem is connected to. For example, this is the option to enable/disable ICMP pass-thru on my Cisco/Linksys E4200.

Zebeon · Aug 2, 2012, 04:33 PM

Since it is a cable modem/router- Aquinus is right, the router part is what is blocking it.
You usually get in the configuration and change it- As he said it will be under security or Mabey if it has a firewall tab, or sometimes even under a WAN tab.-

But unfortunately you will probably have to be onsite to do it. open up a browser and then put in the LAN ip address of the modem/router and see if you can get it. If it is all default then it should have some generic username/password combo or mabey none at all depending on the model-

Black Panther · Aug 2, 2012, 04:58 PM

Things are starting to make sense now.

But I can't find a similar "Filter Anonymous Internet Requests" in my modem's security settings...

It's a Cisco EPC2425 Voice Gateway btw..

puma99dk| · Aug 2, 2012, 05:31 PM

u don't got something called "Block WAN Request" or something like it?

Zebeon · Aug 2, 2012, 05:32 PM

Not in there, those are you wifi settings, but getting closer... is there any other tabs- ie... security, firewall, Wan settings?
looking for ICMP/ping, or a firewall tab to allow icmp from the outside (Wan)?

Aquinus · Aug 2, 2012, 05:43 PM

You're looking in the wrong spot.

Zebeon · Aug 2, 2012, 05:49 PM

Quote:

Originally Posted by Aquinus

You're looking in the wrong spot.

LOL Beat me to it:

http://www.cisco.com/web/consumer/su.../4028315_A.pdf

page 47 on the users guide..

Black Panther · Aug 2, 2012, 06:17 PM

Thanks guys! Luv ya

Jul 30, 2012, 05:00 PM	#1
Black Panther Senior Moderator™ Join Date: May 2007 Posts: 7,114 (3.22/day) Thanks: 2,177 Thanked 1,853 Times in 1,110 Posts System Specs	Why can't I ping this modem? [solved] I know it's working and that I have the correct IP address because I'm viewing cctv over the net through it. But when I ping the IP it says request timed out. __________________ *My Great White Bengal build* Join the techPowerUp! Official Group on Facebook.

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Jul 30, 2012, 05:09 PM	#2
Zebeon Join Date: May 2009 Location: USA Posts: 239 (0.16/day) Thanks: 67 Thanked 65 Times in 47 Posts System Specs	Could you ping it before? Are you talking your local dsl modem? Also, firewall, disabled icmp? more info please

Jul 30, 2012, 05:12 PM	#3
Static~Charge Join Date: Nov 2008 Location: North Carolina, USA Posts: 421 (0.25/day) Thanks: 65 Thanked 76 Times in 59 Posts System Specs	Perhaps the modem is configured not to respond to pings.

Jul 30, 2012, 05:14 PM	#4
xytras Join Date: Apr 2012 Posts: 26 (0.06/day) Thanks: 3 Thanked 3 Times in 1 Post System Specs	Do you see it via arp -a ???

Jul 30, 2012, 05:40 PM	#5
Wrigleyvillain Join Date: Oct 2007 Location: Chicago Posts: 4,556 (2.19/day) Thanks: 1,540 Thanked 1,596 Times in 1,137 Posts System Specs	Yeah ICMP ("ping") can be disabled/blocked. Another security-though-obscurity method. __________________ “i dont care what consoles have they dont have mouse and keyboard” -crazyeyesreaper

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Jul 30, 2012, 06:20 PM	#8
Wrigleyvillain Join Date: Oct 2007 Location: Chicago Posts: 4,556 (2.19/day) Thanks: 1,540 Thanked 1,596 Times in 1,137 Posts System Specs	Yeah by default most likely. __________________ “i dont care what consoles have they dont have mouse and keyboard” -crazyeyesreaper

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Aug 2, 2012, 04:33 PM	#13
Zebeon Join Date: May 2009 Location: USA Posts: 239 (0.16/day) Thanks: 67 Thanked 65 Times in 47 Posts System Specs	Since it is a cable modem/router- Aquinus is right, the router part is what is blocking it. You usually get in the configuration and change it- As he said it will be under security or Mabey if it has a firewall tab, or sometimes even under a WAN tab.- But unfortunately you will probably have to be onsite to do it. open up a browser and then put in the LAN ip address of the modem/router and see if you can get it. If it is all default then it should have some generic username/password combo or mabey none at all depending on the model-

Aug 2, 2012, 04:58 PM	#14
Black Panther Senior Moderator™ Join Date: May 2007 Posts: 7,114 (3.22/day) Thanks: 2,177 Thanked 1,853 Times in 1,110 Posts System Specs	Things are starting to make sense now. But I can't find a similar "Filter Anonymous Internet Requests" in my modem's security settings... It's a Cisco EPC2425 Voice Gateway btw.. __________________ *My Great White Bengal build* Join the techPowerUp! Official Group on Facebook.

Aug 2, 2012, 05:31 PM	#15
puma99dk\| Join Date: Aug 2005 Location: Denmark WTF xD Posts: 2,097 (0.74/day) Thanks: 244 Thanked 466 Times in 326 Posts System Specs	u don't got something called "Block WAN Request" or something like it? __________________ i5-2500k @ 4785mhz \| ECS P67H2-A

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Aug 2, 2012, 05:32 PM	#16
Zebeon Join Date: May 2009 Location: USA Posts: 239 (0.16/day) Thanks: 67 Thanked 65 Times in 47 Posts System Specs	Not in there, those are you wifi settings, but getting closer... is there any other tabs- ie... security, firewall, Wan settings? looking for ICMP/ping, or a firewall tab to allow icmp from the outside (Wan)?

Aug 2, 2012, 05:43 PM	#17
Aquinus Join Date: Jan 2012 Location: Dover, New Hampshire, USA Posts: 4,508 (8.86/day) Thanks: 1,441 Thanked 1,424 Times in 1,064 Posts System Specs	You're looking in the wrong spot. Attached Thumbnails __________________ MyHeat

Aug 2, 2012, 06:17 PM	#19
Black Panther Senior Moderator™ Join Date: May 2007 Posts: 7,114 (3.22/day) Thanks: 2,177 Thanked 1,853 Times in 1,110 Posts System Specs	Thanks guys! Luv ya __________________ *My Great White Bengal build* Join the techPowerUp! Official Group on Facebook. Last edited by Black Panther; Aug 2, 2012 at 06:28 PM.

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