NAT (Network Address Translation) is a method of translating a single IP address used within one network to a different IP address known within another network. One network is designated as the 'internal private network' and the other is the 'public network'. Typically, a company will use a router to map its private IP addresses to one or more public IP addresses and un-map the public IP addresses on incoming packets back into private IP addresses.
This helps ensure security, since each outgoing or incoming request must go through a translation process that also offers the opportunity to qualify or authenticate the request or match it to a previous request. NAT also conserves on the number of public IP addresses that a company needs and allows it to use a single IP address in its communication with the world.
A Non NAT network is one which does not employ NAT and instead allocates externally visible, public facing IP addresses to each IP dependant device on the network. Machines using Non-NAT can be viewed externally, without restriction and as such are less secure if not protected properly.
You will need to ensure that you have a router that allows Non-NAT connections, such as the Voyager series of routers. You can then set your router up with your range of IP address's in the DHCP table, so it will issue them automatically to each machine, or you can manually specify one of the IP addresses on each machine in the TCP/IP properties.
DHCP, or Dynamic Host Configuration Protocol, is a method by which the network router (or other DHCP server) has been set up to know all about your network, and automatically issues the correct information to new machines as they are added to your network. This can save time having to configure each machine on your network individually, and is therefore recommended. The Voyager and Speedtouc 716 series of routers come already configured with a DHCP server running, for your ease of use.
Yes. however this is unsupported by Lixxus and must conform to our terms and conditions, which can be found in our legal section of the support web pages.
This will depend on the type of package you have purchased from Lixxus. We recommend that our home packages are used for a single machine only. Our business grade services can support a number of machines, depending on the type of set-up employed. With a NON-NAT set-up you are limited by the number of public IP addresses you have purchased from us, however you can run a NAT connection behind each of these. With a NAT configuration there are almost no restrictions on how many machines you can have online, as long as you have the network infrastructure in place to handle that many machines and the data throughput. Bare in mind that the more users you have on your network sharing the broadband connection, the slower the connection will become.
No. ISDN is a digital fibre line and ADSL runs on the analogue copper wire telephone network. However, you can ask BT to convert your ISDN line to a standard analogue line and then Lixxus can set up a broadband connection over this OR Lixxus can arrange the conversion for you. NOTE: only one of your existing ISDN numbers can be kept after the conversion.
Certainly. Lixxus can provide the hardware you will need to set up a wireless network and support it for you too. Have a look at our router range on the order pages and our Guide to Wireless Networking for full details. We currently recommend the Speedtouch 716 for your wireless requirements.
The only port lixxus restrict is port 25, commonly used for sending email out. This means that any customer wishing to send out email will have to change the outbound email server, in their mail client/program, to 'relay0.lixxus.net'. Customers using our business packages can have this block removed to allow them to run mail servers, however this facility is not available on our home user packages. For further details or to request unblocking of port 25 simply send an email to support@lixxus.co.uk.
There are many different types of network and many different ways in which you may choose to have your network set up. As such, we can only give generic advice on how a standard network system may be set up, but are unable to provide anything further than this. Unfortunately, for a number of people this may not be practical, in which case it would be advisable to use the services of someone with in-depth knowledge of your network and systems, such as a network consultant, to provide advice more specific to your network.
Unplug the computer and modem for 1 minute.
Refer to the manufacturers website for the latest driver updates.
Uninstall the modem and then reinstall it.
If possible, test on another computer.
Try something else in your USB port to check it is working.
Check the lights on the actual modem.
Ethernet Equipment (non managed)
1. Unplug the computer and router for 1 minute
2. Check your router settings.
3. Have a look at the router status page to see if there's a problem.
4. Check the lights on the router itself.
Finally, contact the Lixxus Support Team who will talk you through any further testing and supply you with a new modem should the problem prove irresolvable.
(Note: Lixxus supplied CPE is guaranteed for 1 year).
We recommend that you use a firewall and anti-virus software to protect your machine/network from attacks. If you are using the Voyager 200, 240, 2000 or 2100 or Speedtouch 716, all of these units have a built in firewall and should be configured according to your internal security policy. If you are running Windows, make sure that you have the latest service pack and updates.
We also recommend a personal firewall of your choice. Have a look at our downloads & links page for some examples of firewalls and anti-virus software, many of which include trial offers. (These are 3rd party software and are supported by the individual companies which supply them. Lixxus do not guarantee their products or offer support for them).
In most situations you will only need one IP address for access to the internet, which is then converted into an internal range of IP address's by your router using NAT. The use of NAT allows you to have an almost unlimited number of machines functioning in a network system, using the least resources, while still maintaining a moderate level of security. For applications where an external IP address is a requirement, you should buy a block of IP addreses.
Unfortunately not, from your assignment of IP address's you will need to remove three. One is for the Network address (AKA gateway address), another for the Broadcast address, and the other for your router. This means that from a block of 8 IP's you will only be able to use 5 for your externally facing machines. Please bare this in mind when selecting a block size.
If your line has a DACS (a device BT use to share a pair of copper wires between two phone lines), it must be removed from the line prior to ADSL activation. The procedure to do this is to apply for your ADSL line as usual and when BT perform the various line tests, they should spot the DACS and arrange for the removal of the device. This may delay your order by a few days, but once removed it shouldn't stop you from obtaining ADSL so long as your line passes the necessary tests. On occasion, BT will decide that the removal of the DACs is not viable and reject the order for broadband.
Ports are used in the TCP/IP protocol to differentiate between different types of data on the internet, streaming these different channels of data to a specific location. There are 65535 different ports, however the most commonly used ports on the internet are:
port 21 (ftp)
port 22 (ssh)
port 25 (smtp email)
port 53 (DNS)
port 80 (web pages)
port 110 (pop3 email)
ports 137 to 139 (netbios)
Port 443 (secure web pages)
Often, ports are blocked so that no traffic is allowed into the network via specific ports For example, disabling port 80 would prevent any web pages to be viewed.
Port forwarding is a feature often built into routers which perform NAT. It allows the router to forward any un-requested traffic generated from the Internet side of the router to a specified internal host. For example, you may run an Apache Web Server on port 80 (webpages) at machine 192.168.1.5 and may want this server accessible from the Internet. A rule can be added to the router so that any requests to port 80 which are not replies to those from the local network are forwarded to IP address 192.168.1.5.
Many routers allow you to assign a global rule so all ports are forwarded to one internal server, or you can specify different IP addresses for different ports. If you have an FTP server running on 192.168.1.6, a separate port mapping can be created. From the outside world both port 80 and 21 are open even though the services are provided by independent internal computer systems.
The RFC (Requests for Comments ) document series is a set of technical and organizational notes about the Internet (originally the ARPANET), beginning in 1969. Memos in the RFC series discuss many aspects of computer networking, including protocols, procedures, programs, and concepts, as well as meeting notes, opinions, and sometimes humour. These are generally considered by most to be the rules of how things should be run on the internet, and are used to standardise the internet
Netiquette is a general term given to internet etiquette, and is generally a guideline on how to use the internet without annoying other users, but still getting the full message across.
With a Lixxus broadband connection you will have a permanent connection to the internet, which is perfect for most email server software. All you need to do is contact the company who host your domain and get them to update your 'MX records' to point to the Lixxus IP you have chosen to run your mail server on.
Please note: Lixxus do not host domains or DNS, however this is not necessary in order to receive mail through your server on a Lixxus connection
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