NTL IP address range

[adrianwb]

Hi all, it's my first post so please be gracious! I'm working in Nepal and shortly to go back to UK for home leave to an NTL broadband-enabled house. I'd like to be able to access a (linux) server here using SSH, but would feel happier if I could give it an IP address (or even IP range) to restrict incoming clients. I know that NTL doesn't give a static IP per se, although according to many posts they don't often change. But I won't know my own NTL IP until I get there and I'd prefer to lock it down a bit at least in the two or three days I'm between A and B. Basically, if I could find out the block of IP addresses that NTL uses, then I could do that, and then when I'm back in the UK, I can narrow it down further. Thanks for any help/suggestions.

Adrian

ntl have hundreds of blocks, it would be a very long list and I doubt anyone has an up to date version (other then ntl's network people).

[Ignition]

I could certainly send you the list of all ntl's current prefixes (Paul M FYI if the rest of us didn't know ntl's current blocks we'd have a lot of trouble knowing how to route stuff to them, there are lists on RIPE and a simple command on a peering router gives them all as well.) however just the list for your area would make far more sense.

http://www.ripe.net/

Pop your IP address in there and it should show the IP addresses being used in your area.

BTW The full list isn't that large, apparently only 148 prefixes.

[jtwn]

ntl as a whole -

Originally Posted by Robin Walker

On the NTL cable modem service, the possible in-service IP address ranges are:

62.252.xxx.xxx to 62.255.xxx.xxx.
80.0.xxx.xxx to 80.7.xxx.xxx.
81.96.xxx.xxx to 81.111.xxx.xxx.
82.0.xxx.xxx to 82.31.xxx.xxx.
213.104.xxx.xxx to 213.107.xxx.xxx.

[beardsley]

Originally Posted by jtwn

ntl as a whole -

Interesting - I presently have a 86.4.xxx.xxx address.

[Ignition]

Originally Posted by jtwn

ntl as a whole -

86.0.0.0/11 is for ntl's use as well.

Infact if you allow the following:

62.252.0.0/14
80.0.0.0/13
81.96.0.0/12
82.0.0.0/11
86.0.0.0/11
213.104.0.0/14

You're probably fairly safe.

/14 CIDR = 255.252.0.0 standard notation
/13 CIDR = 255.248.0.0 standard notation
/12 CIDR = 255.240.0.0 standard notation
/11 CIDR = 255.224.0.0 standard notation

[dsufrin]

I would personally use a free dynamic DNS service like the one offered by www.dyndns.com. Sign up for an account which will give you a hostname which attaches itself to your current IP address. Set your server to allow the hostname and hey presto even with a dynamic IP you can have a fully secure connection.

p.s. you will need to use this program on your PC at home to keep the hostname and IP syncronised http://www.dyndns.com/support/clients/

All the best
Dan the IT Man

[jtwn]

A very good point

[Graham M]

Originally Posted by dsufrin

I would personally use a free dynamic DNS service like the one offered by www.dyndns.com. Sign up for an account which will give you a hostname which attaches itself to your current IP address. Set your server to allow the hostname and hey presto even with a dynamic IP you can have a fully secure connection.

p.s. you will need to use this program on your PC at home to keep the hostname and IP syncronised http://www.dyndns.com/support/clients/

All the best
Dan the IT Man

Nice first post to Cable Forum Have a free rep.