Dynamic DNS and lan?

I`d like to connect to my local http server over the internet. The server
("mars") is connected to the internet via an embedded router and a
DSL-Modem. I understand, that I need a service provider who uses "dynamic
dns" to attach a static hostname to my ever changing IP-Number. Somehow my
server has to tell the service provider the proper IP number.

But what number? The numbers I can get with ifconfig are all restricted to
the local network (192.167...). The dynamic IP number is assigned to the
router, not to "mars". How does the router know which computer in the lan
should receive a data package? Is there some kind of extension to the
IP-number? Or do I simply tell the service provider to connect the hostname
to the IP-number of the router?

A bit confused,
---<(kaimartin)>----
--
Kai-Martin Knaak
gpg-key:
http://pgp.mit.edu:11371/pks/lookup?...index&exact=on

"Kai-Martin" <(E-Mail Removed)> wrote in message
news:dff7mq$17i$(E-Mail Removed)...
>
> I`d like to connect to my local http server over the internet. The server
> ("mars") is connected to the internet via an embedded router and a
> DSL-Modem. I understand, that I need a service provider who uses "dynamic
> dns" to attach a static hostname to my ever changing IP-Number. Somehow my
> server has to tell the service provider the proper IP number.
>
> But what number? The numbers I can get with ifconfig are all restricted to
> the local network (192.167...). The dynamic IP number is assigned to the
> router, not to "mars". How does the router know which computer in the lan
> should receive a data package? Is there some kind of extension to the
> IP-number? Or do I simply tell the service provider to connect the
> hostname
> to the IP-number of the router?
>
> A bit confused,
> ---<(kaimartin)>----
> --
> Kai-Martin Knaak
> gpg-key:
> http://pgp.mit.edu:11371/pks/lookup?...index&exact=on

You would need to set up port forwarding on the router. This is how you
would tell the router that is connected to the outside world which machine
on your LAN gets to receive the communication sent on port 80 (or whatever
your port you are interested in exposing the service on). Some service
providers (and some DSL routers) are notoriously finicky about port
forwarding - some do it to discourage you from hosting your own service -
rather than buying a hosting service from that provider.

Good luck and keep us posted on your status.

SB

Hi,

You need port forwarding on your router. Sometimes this is called also
'Virtual Server' on some router models. There you assign in the case of
http the port 80 to the local ipaddress of your local linux server,
e.g. 192.167.2.10. But some routers don't have that configuration
possibility. Check that.
Then your linux box is reachable over the internet with the external
ipaddress of your router on port 80. And if someone connects over port
80 (http) to the external ipaddress he sees your page of the local
linux server.
Then you have to make an account by an dynamic dns provider. For
example dyndns.org or any other.
Some routers have the possibility to configure a dyndns update service.
If not, then configure your linux server as the gateway/router to the
internet and you have full control over everything. I have no idea in
the moment, how you could get th ipaddress of the routers internet
interface. With the shellcommand 'traceroute' you would get only the
ipaddress of the gateway of your provider, but not of yours. Maybe
someone else has an idea in this thread. One thing I could imagine is:
My router has a welcome webpage of the configuration interface with the
actual nameserver and interface configuration settings. One could write
a little script which gets that page and filters the ipaddress out.
Then the script starts the dnymicdns update program with the ipaddress.
This script you start every 15 minutes or so over a cronjob to have an
uptodate dyndns record. If you need any advice for that let me
know.That would be a funny way.
But the best is to configure your linux box as gateway, if your router
doesn't support a dyndns udate service.
If you arranged the dyndns update service your server is reachable from
anywhere with yourdomain.dyndns.org or somethig like that.

If you need further advice let me know...

Achim

"hakim" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed) ups.com

> I have no idea in the moment, how you could get th
> ipaddress of the routers internet interface. With the shellcommand
> 'traceroute' you would get only the ipaddress of the gateway of your
> provider, but not of yours. Maybe someone else has an idea in this
> thread.

wget -O- http://cfaj.freeshell.org/ipaddr.cgi 2>/dev/null

ynotssor wrote:

> wget -O- http://cfaj.freeshell.org/ipaddr.cgi 2>/dev/null

Ah. Thats cool :-)

---<(kaimartin)>---
--
Kai-Martin Knaak
gpg-key:
http://pgp.mit.edu:11371/pks/lookup?...index&exact=on

hakim wrote:

> You need port forwarding on your router. Sometimes this is called also
> 'Virtual Server' on some router models. There you assign in the case of
> http the port 80 to the local ipaddress of your local linux server,

Thanks!
This is the bit of information I was missing.
Let's see if our router can do this trick.

---<(kaimartin)>---
--
Kai-Martin Knaak
gpg-key:
http://pgp.mit.edu:11371/pks/lookup?...index&exact=on

Kai-Martin wrote:

>
> I`d like to connect to my local http server over the internet. The server
> ("mars") is connected to the internet via an embedded router and a
> DSL-Modem. I understand, that I need a service provider who uses "dynamic
> dns" to attach a static hostname to my ever changing IP-Number. Somehow my
> server has to tell the service provider the proper IP number.
>
> But what number? The numbers I can get with ifconfig are all restricted to
> the local network (192.167...). The dynamic IP number is assigned to the
> router, not to "mars". How does the router know which computer in the lan
> should receive a data package? Is there some kind of extension to the
> IP-number? Or do I simply tell the service provider to connect the
> hostname to the IP-number of the router?
>
> A bit confused,

Since your computer is behind the firewall/router, you'll have to configure
the router to forward requests to the appropriate computer.

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ynotssor wrote:
> "hakim" <(E-Mail Removed)> wrote in message
> news:(E-Mail Removed) ups.com
>
>
>>I have no idea in the moment, how you could get th
>>ipaddress of the routers internet interface. With the shellcommand
>>'traceroute' you would get only the ipaddress of the gateway of your
>>provider, but not of yours. Maybe someone else has an idea in this
>>thread.
>
>
> wget -O- http://cfaj.freeshell.org/ipaddr.cgi 2>/dev/null

whatismyip.com

- --
Ray (Our name is Legion, for we are many.)

Ask me about GPG!
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"Raymond Pasco" <(E-Mail Removed)> wrote in message
news:Ii1Te.249$(E-Mail Removed)

>> wget -O- http://cfaj.freeshell.org/ipaddr.cgi 2>/dev/null
>
> whatismyip.com

The HTML returned requires more processing to clean it up for any automated
script usage, and is not nearly as elegant as the freeshell.org simple text
that is returned, although the end result is the same:

lynx --dump http://whatismyip.com | awk '/Your IP/ {print $4}'

ynotssor wrote:

>> whatismyip.com
>
> The HTML returned requires more processing to clean it up for any
> automated script usage, and is not nearly as elegant as the freeshell.org

The real difference seems to be the catchy name. Somebody shelled out
$386,100 to get their hands on that url:
http://www.dnjournal.com/archive/dom...es08_02_05.htm
(buried abut midway between lots of other rather irrational figures)

---<(kaimartin)>---
--
Kai-Martin Knaak
gpg-key:
http://pgp.mit.edu:11371/pks/lookup?...index&exact=on