GPRS IP addressing

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UM - 24 Nov 2006 13:57 GMT

Hi,

I would like to know about GPRS IP addresses. In theory every handset
has an IP address (if GPRS connection is activated), but in practice
unique IP address requires high number of IP addresses and there is
already shortage of IP addresses.

So I was wondering, if GPRS networks are NAT subnets like WiFi we use
at home.

What about 3G IP addresses?

Any comments on GPRS IP addressing would be helpful.

Regards,

UM

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Phil Chung - 24 Nov 2006 14:28 GMT

> I would like to know about GPRS IP addresses. In theory every handset
> has an IP address (if GPRS connection is activated), but in practice
[quoted text clipped - 5 lines]
>
> What about 3G IP addresses?

Yes, they do use NAT to share IP addresses. If you install something
like vxUtil (http://www.cam.com/vxutil.html) on a PocketPC PDA you'd be
able to find your local IP address. Going to http://www.whatismyip.com
will give you the address of the proxy/gateway used for Internet access
on the device

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UM - 24 Nov 2006 14:51 GMT

Thanks for your reply.

I posted the same message to alt.cellular.nokia and I have a reply over
there as well.

The other guy that replied thinks, operators employ a mixture of global
IP addresses and NAT addresses. His operator uses dhcp to assign a
global IP address.

Basically, it depends on the operator. Not all of them have a wide
range of IP addresses available.

regards

> Yes, they do use NAT to share IP addresses. If you install something
> like vxUtil (http://www.cam.com/vxutil.html) on a PocketPC PDA you'd be
> able to find your local IP address. Going to http://www.whatismyip.com
> will give you the address of the proxy/gateway used for Internet access
> on the device

Reply to this Message

Phil Chung - 24 Nov 2006 17:00 GMT

> Thanks for your reply.
>
[quoted text clipped - 7 lines]
> Basically, it depends on the operator. Not all of them have a wide
> range of IP addresses available.

It will depend somewhat on the operator. My T-Mobile MDA Vario II and
my work O2 XDA II both have private 10.x.x.x series IP addresses. I
can't check on my Nokia N80 currently as I don't have any software to
look at the IP address.

Going to www.whatismyip.com reveals a real public IP address.
Operators will have several public IP addresses acting as gateways for
phones/PDAs, depending on where you are and what cell you are connected
to.

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Jon - 24 Nov 2006 18:45 GMT

uralmutlu@gmail.com declared for all the world to hear...

> Hi,
>
[quoted text clipped - 5 lines]
> So I was wondering, if GPRS networks are NAT subnets like WiFi we use
> at home.

Yes, the IP address of your phone is not a publicly available or
"pingable" one I don't think. Orange for example dish out in the
10.xxx.xxx.xxx range yet www.whatismyipaddress.com reports me as
213.205.237.222

> What about 3G IP addresses?

No different.

Signature

Regards
Jon

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Stephen Henson - 24 Nov 2006 22:46 GMT

> Yes, the IP address of your phone is not a publicly available or
> "pingable" one I don't think. Orange for example dish out in the
> 10.xxx.xxx.xxx range yet www.whatismyipaddress.com reports me as
> 213.205.237.222

Just as well really, a ping flood attack at some networks GPRS rates
could prove painful.

Steve.

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UM - 25 Nov 2006 00:24 GMT

> Just as well really, a ping flood attack at some networks GPRS rates
> could prove painful.
>
> Steve.

I read something on this subject. I think cost is an issue, and NAT in
a way stops unwanted connections.

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Soruk - 25 Nov 2006 01:25 GMT

>> Just as well really, a ping flood attack at some networks GPRS rates
>> could prove painful.
[quoted text clipped - 3 lines]
>I read something on this subject. I think cost is an issue, and NAT in
>a way stops unwanted connections.

Didn't stop probes coming in from a trojanned machine that was also
connected by GPRS...

(ipchains on my linux laptop stopped them getting any further, but even
the attempts were using a little bit of bandwidth.)

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