Can you findl bandwidth speed from an IP address?

Is it possible to find out somesones bandwidth from an ip address?. Im
guesing no, but need to ask incase someone knows somthing i dont




Mike

On 28 Aug 2005 17:11, "Mike" <(E-Mail Removed)> wrote:

>Is it possible to find out somesones bandwidth from an ip address?. Im
>guesing no, but need to ask incase someone knows somthing i dont

I bet you can if you are the user's ISP, but I doubt it otherwise !! You
can tell a link is "quiet" or "busy" by ping times being low or high (esp
if you have long term stats for the IP), but not actual speed AFAIK.

--

UK ADSL <http://tinyurl.com/5jpa4> - Happy to save cash with Plus.Net!!

"Mike" <(E-Mail Removed)> wrote in news:4311e240$0$22951$ed2619ec@ptn-nntp-
reader01.plus.net:

> Is it possible to find out somesones bandwidth from an ip address?. Im
> guesing no, but need to ask incase someone knows somthing i dont

No, you may be able to make an educated guess as to what class it is as
some IPs are set to different pools (listed as ADSL dial or something
similar). Reverse DNS sometimes gives hints but not always.

--
Colin
*Drop DEAD from the email address to reply*

Mike <(E-Mail Removed)> wrote:
> Is it possible to find out somesones bandwidth from an ip address?. Im
> guesing no, but need to ask incase someone knows somthing i dont

If your link is faster, and you can get something on their machine to
respond to you in some way, then the general idea is to throw packets
at their machine till the response slows down.
At that point, you'll have gotten close to measuring their free bandwidth.

In article <Xns96C0C067CA660cwfidei@84.92.1.10>,
cw <(E-Mail Removed)> wrote:
>"Mike" <(E-Mail Removed)> wrote in news:4311e240$0$22951$ed2619ec@ptn-nntp-
>reader01.plus.net:
>
>> Is it possible to find out somesones bandwidth from an ip address?. Im
>> guesing no, but need to ask incase someone knows somthing i dont
>
>No, you may be able to make an educated guess as to what class it is as
>some IPs are set to different pools (listed as ADSL dial or something
>similar). Reverse DNS sometimes gives hints but not always.

Actually, "maybe" is a better answer... There is an old unix utility
called "bing" that attempts to calculate the link speed between 2 IP
addresses. (eg. someones IP address and their immediate downstream
router).

However the manual page gives this:

Some of the final stats (average throughputs) almost never give a even
marginally correct result.

I've just tried it with a friends ADSL connection: 283.971Kbps and I
know this has 2Mbps down and 256Kbps upstream, so somethings not quite
right here, and I suspect bing was written in the days when no-one would
consider using an asymetric bandwidth service...

Gordon

> I've just tried it with a friends ADSL connection: 283.971Kbps and I
> know this has 2Mbps down and 256Kbps upstream, so somethings not quite
> right here, and I suspect bing was written in the days when no-one would
> consider using an asymetric bandwidth service...

Yeh but bear in mind your upload connection will be 256kbs so it's possible
you've measured the capacity limit of your upload rather than his download.


--
Regards

John Lyons
Netserve Consultants Ltd

Ask us about our online Antivirus and Junk mail scanning service
http://www.domaincity.co.uk +-+-+-+ (E-Mail Removed)

"Ian Stirling" <(E-Mail Removed)> wrote in message
news:43121520$0$1301$(E-Mail Removed)...
> Mike <(E-Mail Removed)> wrote:
>> Is it possible to find out somesones bandwidth from an ip address?. Im
>> guesing no, but need to ask incase someone knows somthing i dont
>
> If your link is faster, and you can get something on their machine to
> respond to you in some way, then the general idea is to throw packets
> at their machine till the response slows down.
> At that point, you'll have gotten close to measuring their free bandwidth.

Ah. A DoS attach then. ;-)

"TheDysk" <(E-Mail Removed)> wrote in message
news:BsCQe.250518$(E-Mail Removed) m...
>
> "Ian Stirling" <(E-Mail Removed)> wrote in message
> news:43121520$0$1301$(E-Mail Removed)...
>> Mike <(E-Mail Removed)> wrote:
>>> Is it possible to find out somesones bandwidth from an ip address?. Im
>>> guesing no, but need to ask incase someone knows somthing i dont
>>
>> If your link is faster, and you can get something on their machine to
>> respond to you in some way, then the general idea is to throw packets
>> at their machine till the response slows down.
>> At that point, you'll have gotten close to measuring their free
>> bandwidth.
>
> Ah. A DoS attach then. ;-)
>

Whoops. Should have read as attack not attach! Damn these dyslexic fingers.

In article <431248ec$0$97130$(E-Mail Removed)>,
John Lyons <(E-Mail Removed)> wrote:
>
>> I've just tried it with a friends ADSL connection: 283.971Kbps and I
>> know this has 2Mbps down and 256Kbps upstream, so somethings not quite
>> right here, and I suspect bing was written in the days when no-one would
>> consider using an asymetric bandwidth service...
>
>Yeh but bear in mind your upload connection will be 256kbs so it's possible
>you've measured the capacity limit of your upload rather than his download.

Bing is supposed to be local speed independant as it measures the time
difference (or something) ie. pings the first IP address, then pings
the second and uses the time difference & packet size to compute speed.

In any case, I did those tests from a host at the end of a 10Mb (symetric)
line to the ISP... (Who tell me they have 100Mb from Exeter to London)

Gordon

(E-Mail Removed) (Gordon Henderson) wrote in news:devosa$rsd$1
@lion.drogon.net:

> ie. pings the first IP address, then pings
> the second and uses the time difference & packet size to compute speed.

Sounds like an inherently flawed method of determining bandwidth. There
could be packet shaping, fragmentation maybe even a dodgy router causing
higher latency for ping packets. I wonder how it handles satelite :0)

--
Colin
*Drop DEAD from the email address to reply*