30 October, 2007

Hardware of the Ericsson W25

Before looking at the hardware of the Ericsson W25, I would like to emphasize once more the importance of changing your passwords in the router. This morning I found very nice traces of an attack against my router in the logs:

Oct 30 08:31:37 (none) auth.err sshd[9534]: error: Could not get shadow information for root
Oct 30 08:31:37 (none) auth.info sshd[9534]: Failed password for root from 220.90.216.15 port 60418 ssh2
Oct 30 08:31:41 (none) auth.info sshd[9536]: Illegal user andrew from 220.90.216.15
Oct 30 08:31:41 (none) auth.err sshd[9536]: error: Could not get shadow information for NOUSER
Oct 30 08:31:41 (none) auth.info sshd[9536]: Failed password for illegal user andrew from 220.90.216.15 port 60649 ssh2

and this went on for 900 more lines. Apparently someone was trying to log into my router by trying out username/password pairs. The original Ericsson password for root is so easy, that probably the attacker would have succeeded.

But, now lets turn to the HW:

It is based on the Intel XScale 425 development platform which is designed for voice gateway applications.

It has the following elements:
  • Intel® IXP425 network processor at 533MHz
  • a built in ethernet switch
  • 2 usb 2.0 ports
  • a usb 1.0 port
  • 2 fxs phone ports
  • 16 megabytes flash rom
  • 16 megabytes ram
  • two mPCI connectors

In the Ericsson W25 in one of the mPCI slots there is a Sierra Wireless mc8775v hsdpa modem and in the other a Broadcom BCM4318 802.11 WLAN card.

In the next post I will write about the basic software of the router.

29 October, 2007

Accessing the command line interface of the Ericsson W25

The first step if you want more from your Ericsson W25 is to gain access to its command line interface. The command line interface (CLI in the future) can be accessed over the network either by telnet or ssh protocol. Telnet is available only from within your local network, and for accessing it you can use the telnet command built into Windows: telnet 192.168.1.1
The ssh access is available both from the internal network and from the internet and you should use an ssh client like PuTTY to access it.

There are two user names available for the CLI: root and operator. You can find their default password in the document about SW upgrade on http://www.mobiledata.net.au/.
Once you have logged in, you find yourself in a linux environment. Linux commands like ls, pwd, mount etc. will work.

There are two specific commands for the router: cf and st.

The cf command is used to set and retrieve the parameters of the router. When called without parameters it gives a help about the available commands. The parameters of the Ericsson W25 are organized into a tree structure, and with the cf command you can interrogate or set any node on the tree. For example if you would like to change the IP address of the router, you can do that with the following command: cf set ip.lan.address 192.168.1.1 Here athe ip.lan.address defines the note on the tree. The command cf show, lists all nodes with their values.

The st command displays different statistics. It has the following options: usb, lan, wan, wlan, nat, natverbose, wan-stats, tel, pm and system. One of the most interesting is the wan-stat which provides reception statistics for the HSDPA modem, so you can check if the coverage is good enough at your place.

One important note, before you continue to use your W25, that the same way as you could figure out the default password, anyone else can do it, and if you do not change it, practically anyone from the internet can log into your router. So log on to the web interface with the user name root and operator and change their password in the top right side of the general tab to something with is not the standard. If you are more advanced, you can do this with the cf command as well, but you have to figure out the right node in the parameter tree yourself.

In the next post I plan to write some sentences about the hardware of the Ericsson W25.

28 October, 2007

Ericsson W25 Fixed Wireless Router Introduction

A fixed wireless router means a device which is connected to the internet using a mobile network and it distributes the internet access for a home/small office network using wired and/or wireless LAN. The reason for using this kind of devices is either because where you live/work you do not have a fixed internet or simply because the price for a mobile internet can be lower than for a fixed one.

The Ericsson W25 is a GSM/UMTS/HSDPA one, it can be used on GSM or UMTS networks. The theoretical maximal donwload speed is, 7.2 Mbit/sec with HSDPA, but today only very few carriers support this and even if it is supperted you can not reach this speed. The network which I am using supports only 1,8 Mbit/sec where I live and even with this theoretical possibility I can not reach higher speed than 1,4 Mbit/sec. However this speed is almost 3 times higher than my previous internet connection which was an outdoor WLAN based 512 k connection.

Beside the internet access this device has the possibility to connect traditional telephones to it, in this case call made from the foxed phones will be connected trough the wireless network. In a lot of countries, this can save you a lot of money, when calling mobile numbers.

The Ericsson W25 was designed with the customers in mind, this means that a lot of effort was taken to make it as simple to use as possible. This was sucessfull, after purchasing, you need only to plug in a SIM card and plug it into an AC outlet and voila, it is up and running. Of course if don't want to share your internet connection with your neighborhood, you need to run trough the web based setup wizzard. The management web pages are also very simple, they only contain the most important parameters.

If this is not enough for you, then this Blog is for you, as in the next posts we will look into more advanced configurations and look into how we can hack into the router, to enable new features.

Till then I recomend you to visit this address: http://www.mobiledata.net.au/ here you can find the newest firmware, which is much more stable than the one on the official W25 site.

20 October, 2007

What is networking at home about?

Altough networking is used more when people are getting connected, in my case this is about computer networks at home. What you can expect here are some rather technical articles about what I have done or what I wanted to do in my home LAN.

The first blogs will be about the Ericsson W25 router which is a mobile network to WLAN router.