Improve company productivity with a Business Account.Sign Up

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 203
  • Last Modified:

What is IP Address - Zyxel P660H

Hi all,

I have a customer using an Cisco ASA with a Zyxel P660H running in bridged mode - so the ASA handles PPPoE auth and holds the public IP on an ADSL 2 circuit.

This is working fine but I have been asked to document it and there is no record of the IP Address of the Zyxel - obviously I can't reset it as the set-up is working.

Is there any way (either from the ASA CLI or Snooping on the network) that I can determine the IP of the Zyxel and grab the config from it?

I tried all obvious IP addresses plugging my laptop directly into the back but no joy!

Cheers

K
0
techmiss
Asked:
techmiss
2 Solutions
 
AlexiosCommented:
Hello

Install to your laptop this software
http://www.lookatlan.com/download_lal.html

You can see all ip addresses in your inside network with host names and device brands.

Possible you will find Zyxel as well
0
 
techmissAuthor Commented:
Hi Thanks for your reply.

I have used Fing already to run a scan of the network.

Unfortunatly this does not work as I cannot connect to the network as I am unsure what IP range I should be using when connecting,.

I have tried scanning the network without giving my NIC and IP and it does not pick anything useful up.

K
0
 
Pete LongTechnical ConsultantCommented:
if its in bridged mode the IP goes to the ASA?

simply issue a "show ip" on the ASA
0
Get Cisco Certified in IT Security

There’s a high demand for IT security experts and network administrators who can safeguard the data that individuals, corporations, and governments rely on every day. Pursue your B.S. in Network Operations and Security and gain the credentials you need for this high-growth field.

 
AlexiosCommented:
Agree with PeteLong

With the command mentioned above you will see also the class of the network in one interface, for sure.
0
 
techmissAuthor Commented:
Yes, I can see the IP on the ASA as 128.125.xx.135/32 but there is no address I can give myself using that address as the gateway.

Presumably because it is a /32 as as soon as I give myself another IP it says the gateway is on a different network segment....

K
0
 
David AtkinTechnical DirectorCommented:
Are you connecting to the correct port? Check that you're not connecting to a WAN Port.
0
 
techmissAuthor Commented:
The only WAN port is ADSL so I can't get Cat5e in it.

Just to check though I have tried all the ports and can't get in on any of them.

For my sanity, if the Zyxel is bridging that 128.125.xx.135/32 address what IP can I use to connect assuming I have the correct port?

K
0
 
techmissAuthor Commented:
I think it is in transparent briding which might explain the /32 address..


Still can't get onto it though!!
0
 
Fred MarshallPrincipalCommented:
Here is the likely situation:
The Xyxel likely does have an IP address but it even may be one that is not associated with your network.  It's only function would be to access the device as through telnet or a GUI.  In fact, if you know all the IP addresses for your network then you would likely know that an IP address in your subnet is used up.  
Consider the Xyxel setup instructions and what IP it starts with as a possibility.

[In case this is confusing, as it was for me in earlier days, I have attached a diagram of a simple model of a wireless router.  The idea is the same.  There is an internal "port" in the device that has an IP address that may have nothing to do with your network.  It would be in the part that's shown as the CPU and associated with the "configuration functions".  And, this IP address is accessible through the LAN switch because simple switches don't care about IP addresses.]

Only you know whether this is an important aspect of your network documentation but I would think that it is.

Here are some options - I'm assuming that the Xyxel is in production in view of its location in the network.

Does the Xyxel have a serial port?
If so, connect to the serial port (which doesn't need an IP address) and use the provided interface to figure out what the IP address(es) might be.

If there's no serial port then does the device have an available LAN port?
If so, connect a laptop to a LAN port.  You might give the laptop an IP address that has the largest subnet(s) possible.
So, for example, if your LAN is 192.168.1.0/24 then I would perhaps use 192.168.0.2 255.255.0.0 (note the 3rd octet is a zero!).  Then I would ping scan 192.168.0.1 to 192.168.255.254.  Same idea for 10.xxx.xxx.xxx: 10.0.0.2 255.0.0.0 (now the 2nd octet is a zero also). ... an just hope that it will respond to pings.  For this type of interface it likely will.

If no serial port and no available LAN port then you are stuck with doing the latter test with the Xyxel off line on a LAN port.
Simple-Model-of-a-Wireless-Route.pdf
0
 
TimotiStDatacenter TechnicianCommented:
The default of a the P-660HN is 192.168.1.1/24.
Even in bridge mode, if you connect to a LAN port, and give your laptop a static from the 192.168.1.0/24 range, you might be able to connect to it.

But it's in bridge mode, so it is just a dumb bridge, not an L3 device. So depending on your documentation, I'd only display it as a DSL bridge.

Tamas
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Featured Post

What Kind of Coding Program is Right for You?

There are many ways to learn to code these days. From coding bootcamps like Flatiron School to online courses to totally free beginner resources. The best way to learn to code depends on many factors, but the most important one is you. See what course is best for you.

Tackle projects and never again get stuck behind a technical roadblock.
Join Now