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mikebrown Posted:
there, Please
check out -

In The Forum:
Hard Wiring - Installation
Hardwiring in a Rental House
On Oct 24, 2017 at 22:29:48

mikebrown Posted:
Hello, I think
you should consult
it with the Expert
they can surely
help you

In The Forum:
Hard Wiring - Installation
Hardwiring in a Rental House
On Jun 24, 2017 at 09:15:34

Haniltery Posted:
For wipe call
history also some
of the offline, in
gengral , it
usually apply to

In The Forum:
How to Delete call history from online account?
On May 09, 2017 at 06:14:26

diana87 Posted:
You have to use
VPN service to
and get free
access while

In The Forum:
Recent calling problem from Egypt
On May 02, 2017 at 17:28:06

dconnor Posted:
What is the main
number on the
account? And
which one is the
virtual number?

In The Forum:
Vonage UK
How do you call 999
On Apr 27, 2017 at 18:52:02

Trafford Posted:
Seems like a
question. We
rely exclusively
on a Vonage system
for our

In The Forum:
Vonage UK
How do you call 999
On Apr 27, 2017 at 10:42:50

diazou Posted:
Hello, It's
compatible with
Android your phone
? Thanks!

In The Forum:
IP PBX for small business
On Mar 28, 2017 at 12:42:33

jeddaisg Posted:
Hi all We have
a Vonage VOIP
system for our
office. Lately,
our call quality

In The Forum:
Ethernet Cable; Wiring schematic? 568-B?
On Feb 23, 2017 at 18:33:52

beast321 Posted:
I don't know if
you heard, that
many more
Dreamcast games
are opened up

In The Forum:
Fax - Tivo - Alarms
Using phone as a dial up modem for Dreamcast Gaming
On Feb 16, 2017 at 03:16:51

Av8rix Posted:
Sorry to start a
new thread on an
old topic but when
I google “Vonage
MAC address

In The Forum:
New adapter and router -- MAC change
On Jan 11, 2017 at 01:07:21

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Vonage Well I did not answer his question in the original post since it was posted by someone

Well I did not answer his question in the original post since it was posted by someone else 1 year ago and he reopened it today. It is fine that people are curious and want to better understand why things are the way they are especially those who are security conscious. As long as those who are security conscious are network professional themselves and are not just going off of hear say by someone who believes they are a network professional..

In a case like this, one must first understand that the code base in the VDV21 is linux based which means it uses a form of iptables. Next, one must understand how an iptables firewall works. There are drop and reject statements that can be used. Depending upon which line in the iptables uses drop / reject for each port or service is only known to the chipset developers who wrote the code. Each will provide a different result such as Closed vs Filtered.

Closed Port:
- If you send a SYN to a closed port, it will respond back with a RST.
Open Port:
- If you send a SYN to an open port, you should receive a SYN/ACK.
Filtered Port:
- The packet is simply dropped and you receive no response (not even a RST).

I have personally just run a port scan using NMAP from a linux box against the WAN port of a VDV21 and the only known ports that show up are 8080 tcp as Open because the Web Remote Management is Enabled and 10000 tcp as Closed. If I scan just tcp port 22 it shows as Filtered just as every other port that is not in use. So from what I see since the WAN port shows tcp port 22 as Filtered, this would be Stealth based upon the definition of what Filtered and Closed are.

I then ran another port scan after enabling ssh in the VDV21 and it showed as Open as expected.

After disabling ssh, I ran another scan and sure enough, it now shows up as Closed. So it looks like the ssh service was off by default until I turned it on and the iptables entry filtered the port. After turning on ssh for the first time, it turns the service on and creates an iptables entry to allow connections. After disabling ssh, it then leaves the iptables entry which will allow connections when the service is running so therefore is no longer filters port 22. This is what would cause it to show up as a Closed port since the firewall does allow it but the service is just not listening on this port because it is disabled.

It is possible that a factory reset will set it back to a filtered state if it believes the ssh service was never enabled. However, since I am remotely accessing the VDV21 right now, I cannot test this out otherwise I will lose the ability to log back into the web interface to test other things.

Read The Full Thread:

V-Portal - Port 22?

Hello, After a series of tests I've concluded that the issue I'm having is
Port 22 is used for secure shell for troubleshooting purposes but is disabled
Could someone please go over with me the procedure for forwarding Port 22? I did
The port is not enabled. If it were enabled, when sniffing for this port, it would
OK, you did a good job telling us that port 22 can only be enabled by the used when
If you want it stealthed then you need to put it behind another router or firewall
tchmgr I don't know why you are wasting your time. You answered his question 3 times
:? I have been using a VDV21 for over a year, and recently moved to North Carolina

VonTechMgr posted "Well I did not answer his question in the original post since it was posted by someone" on 11/28/2009

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