Re: [LARTC] ping can do DS?????

[Juergen Chiu <lchou@staff.pccu.edu.tw>]

Hi,

Maybe you have seen my question about the "ping -Q"...
I feel strange that -Q is for what goal?????
For DiffServ is useless even it can modify the TOS byte, or it's really
for the Router which has DiffServ function???
In my opinion, I think ping is just one time a request and a reply msg.
So I am not sure that ping -Q is for the DiffServ or just for comfortable
to test DiffServ???

Please give me some advice...thx!!!!

On Fri, 18 May 2001, Kurt Wagner wrote:

> Hi,
> 
> > I don't have the -Q option for the ping command, what does it doe on your
> > system?
> 
> as far as I can guess he talkes about Alexy's ping clone from the iputils
> package. It is a enhanced ping with more options, like "-Q".
> 
> 
> host_10.0.0.1: ping -help
> Usage: ping [-LRUbdfnqrvV] [-c count] [-i interval] [-w wait]
>         [-p pattern] [-s packetsize] [-t ttl] [-I interface address]
>         [ -T timestamp option ] [ -Q tos ] host
> 
> > Know that ping uses a special type of IP packets, ICMP. I wouldn't be
> > surprised if the system changes the DS field automaticly.
> 
> Jep, the app sets the DS field (the former TOS field) in the IP
> header of the ICMP echo request packets to the choosen value (via
> setsockopt). Quit useful for (diffserv) testing...
> 
> 
> host_10.0.0.1: ping -Q 0x1a 10.0.0.2
> PING 10.0.0.2 (10.0.0.2) from 10.0.0.1 : 56(84) bytes of data.
> 64 bytes from 10.0.0.2 (10.0.0.2): icmp_seq=0 ttl$4 timeB.965 msec
> 
> host_10.0.0.2>: tcpdump icmp
> 10.0.0.1 > 10.0.0.2: icmp: echo request (DF) [tos 0x1a,ECT]
> 10.0.0.2 > 10.0.0.1: icmp: echo reply (DF) [tos 0x1a,ECT]
> 
> And, look - it really works. Heureka! :)
> 
> 
> Kurt
> 
> 
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