cablecom [change IP address?]

Tech, TV, Mobile, Internet and Geek Corner
21

it does play a role when you are on the internet, but not one that you can see.

it is involved in the NAT - network address translation - that the Cablecom gateway does in order to get the packets it receives at its public Ip address to you, the right cablecom customer. so it nat's it on the way up to the internet through the gateway, and de-nat's it on the way down from the internet through the gateway.

22
Utter tosh. Cablecom doesn't use NAT; it issues real public IP addresses (like many ISPs do). The dynamic IPs also hardly ever change (I've had the same three for years) which is dead handy when you want to run server applications such as SSH.

23
This is utter nonsense. If your IP doesn't change, then it's not dynamic, is it? It's a static IP address. And, the OP mentionned that his IP was a 192.168.xxx.xxx address. That is a local area network, 192.168.xxx.xxx being reserved for Local Area Networks in the RFP although don't ask me which number. If your IP is a 192.168.xxx.xxx then your ISP uses NAT.

And, there is no way that one can use a public IP address. There are not enough in the world, with the IP version 4 addresses. And not even people have switched to IP version 6 addresses yet. i just checked both my local and public IP addresses and they are different. That means NAT and both addresses are version 4.

24
NAT is most likely being done by the wireless router in the OP's home.

25
Before this discussion gets any more lively, the information about dynamic external IP addresses is available at https://support-en.upc-cablecom.ch/app/answers/detail/a_id/306/kw/fixed%20ip%20address

This page is relevant for users who connect their PC directly into a cable modem, ie not through a router.

To see your external IP address allocated by your service provider , you can visit a site e.g. http://www.speedtest.ch

Usually, an ISP will force a change of your external IP Address quite regularly to make it difficult for you to run server applications at home (without paying extra for a static IP address), and this niche has been exploited by companies like dyndns.com

26
Ok. You're clearly a moron, so I'll keep this simple.

- I most certainly do have dynamic IP addresses (Cablecom Fiber 100 with three dynamic IPs).

- Cablecom configures the IPs as 'sticky' so that coming back with the same MAC tends to give the same IP. Changes are not unknown though (happens maybe once every two years for me).

- Here's an example of a service running on a 'dynamic' Cablecom IP address: http://holloway.ch (the server is sitting under my desk and is connected to the cable modem).

- If the OP sees a 192.* on his machine then that was issued by his local router/firewall. I have a similar setup on my local network.

- There are 4 billion IPv4 addresses and Cablecom has a good chunk of them. It may well be difficult now to setup new ISP and give each customer a public IPv4, but companies such as Cablecom have been 'grandfathered in'.

- Groaning a post that you disagree with is not the act of a gentleman. Use discourse not the easy click of a button.

27
Oh my! A "sticky" IP address is called a static IP address!

28
Not if it's issued by DHCP.

29
Cablecom modems do have a NAT mode. I wonder why?

http://community.upc-cablecom.ch/posts/4a16683ade

and

There isn't any important distinction between static and sticky according to all the online sources I have consulted.

30
I see my original assessment of you was spot on, but I'm prepared to be tolerant and give you some lessons since it's Christmas.

The NAT mode refers to the user's internal network. You can run a cable modem in two ways:

1) Direct mode where the public IP address is issued directly to the machine via the cable modem.

2) NAT mode where the cable modem issues a 192.* address to the machine and NATs to the public address (which it obtained from the provider's DHCP server).

The advantage of (2) is that it simplifies plugging multiple machines into the cable modem. In both cases you have the same public IP address.

As regards to the difference between static and dynamic (whether 'sticky' or not):

Static - your provider issues you with a public IP address (or range) and a gateway IP which you set into the network configuration of the machine.

Dynamic - The public IP and gateway are issued automatically by the provider's DHCP.

The important difference is that you know the static IP before setting the computer up and so can configure it into DNS. With a dynamic IP, you have to discover the IP if you want to provide DNS resolution. (If it's 'sticky' you don't have to do this very often but it can still change at any time).

31

32
For completeness, I would add that although NAT usually refers to local NAT, there is sometimes NAT at the ISP level (CGN/LSN) but is somewhat unusual due to various issues.

NAT (at home) allows several machines to talk to the outside world using the same IP address.

33
you can also have a printer on the network as well as a computer. that's also not an issue.

(and who says bumping 3 year old threads can't be fun?)

34
It's called a router, not a gateway. You don't need a gateway for multiple LAN's...

35
oops. god help us all now that UTH has come to put his tuppenceworth in...

merry xmas UTH

36
You really need to do your Network 101's... If you really think ISP's are using NAT for your public/WAN IP address you are clearly misunderstanding NAT, Gateways and , as already clarified, routers.

37
Merry Christmas Phil

38
No, I know a lot that do, and many GPRS and 3G providers as well.

There is no misunderstanding of NAT. It works exactly as I described.

39
Routers are gateways - they do run the Border Gateway Protocol, BGP after all.

Gateways is a telecom term for equipment that allows one network to communicate with another.

40
grab your drinks from this point on, you need to do a shot for each post you read...