bandwidth calculation

[aneesholv]

Hai
When I ping my remote system through my WAN link its response is " Reply from 192.168.1.1: bytes=32 time=20ms TTL=128 ". Can you help me to calculate the Bandwidth of this WAN Link

Regard
Aneesh

 

[alqasim]

I think ...no

May be if you did a ping from switch with high repeat number you can know approximately the throughput on that link

I mean if the ping test was done 1000 time in a second with a size of 32 byte you may conclude that the throughput isn't less than 1000 * 32 byte .

 

[Bingo600]

Are you sure you are pinging a "remote" end ??

192.168.1.1 could be your local router's lan interface , and your default-gateway.
It's a RFC-1918 address (local , non routable on the internet)

The TTL seems to indicate that you are either pinging something - 128 hops away , or something 0 hops away.
If the TTL was 256 , and ended up being 128 when your destination was reached , then 20ms latency is impressive.

My guess is that your start TTL was 128 , and that you have never left your local lan.
And then 20ms isn't impressive at all , unless it was the first ping-packet , where an ARP is usually delaying the response.

Ohh: And as said above ... Ping is close to useless for calculating bandwidth.

/Bingo

- - - Updated - - -

Ohh ....

If this is a "Trick question" , and not an error/misunderstanding from your side.
The bandwidth is the same as your PC->local-lan bandwidth , as you never left the local lan.
Those are usually equipped with 100Mbit switch modules. Ie. Linksys WRT54G (cheap homerouter)

/Bingo

 

[alqasim]

Hi Bingo600

Do you agree with me if the ping test done for a remote end could give you indication about your link bandwidth if your link is ( bottle neck ) to of the whole path ?

and How could TTL =128 means 0 hops in the path?

 

[Bingo600]

Hi Bingo600

Do you agree with me if the ping test done for a remote end could give you indication about your link bandwidth if your link is ( bottle neck ) to of the whole path ?

I'd say a normal ping test would tell more about your latency (and hopcount) , but i'm not sue i understand your question 100%.

Hi Bingo600
and How could TTL =128 means 0 hops in the path?

Normal ICMP usually starts with a TTL of 256 (rare) , 128 (normal) , 64 (normal , my ubuntu uses this).
If he was starting with 256 , his target would be 128 hops away , and then the echo time is very impressive (as in ... close to impossible).
So i concluded he started with 128 , and never left his local lan

/Bingo