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

Black Panther · Jul 30, 2012

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.

:confused:

Zebeon · Jul 30, 2012

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

Also, firewall, disabled icmp?

more info please

Static~Charge · Jul 30, 2012

Perhaps the modem is configured not to respond to pings.

xytras · Jul 30, 2012

Do you see it via arp -a ???

Wrigleyvillain · Jul 30, 2012

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

Black Panther · Jul 30, 2012

Zebeon said:
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.

Static~Charge said:
Perhaps the modem is configured not to respond to pings.

Might be.

xytras said:
Do you see it via arp -a ???

What's the exact command I should use?
:eek:

Wrigleyvillain said:
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

Black Panther said:
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

Yeah by default most likely.

Black Panther · Jul 30, 2012

xytras said:
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

Black Panther said:
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

Wrigleyvillain said:
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

Black Panther said:
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

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

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..

Shou Miko · Aug 2, 2012

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

Zebeon · Aug 2, 2012

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

You're looking in the wrong spot.

Zebeon · Aug 2, 2012

Aquinus said:
You're looking in the wrong spot.

LOL Beat me to it:

http://www.cisco.com/web/consumer/support/userguides2/4028315_A.pdf

page 47 on the users guide..

Black Panther · Aug 2, 2012

Thanks guys! Luv ya

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

Black Panther

Zebeon

Static~Charge

xytras

Wrigleyvillain

PTFO or GTFO

Black Panther

xytras

Wrigleyvillain

PTFO or GTFO

Black Panther

xytras

Black Panther

Aquinus

Resident Wat-man

Zebeon

Black Panther

Shou Miko

Zebeon

Aquinus

Resident Wat-man

Zebeon

Black Panther

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