Packet Generator for DSCP marking

[Gerard Gacusan]

Anyone uses packet generator either windows or linux? Trying to determine dscp markings end-to-end ...

I know extended ping works directly from the router but i'm wanting to generate from the client side.

thanks in advance

Gerard

[andrew.prince · Accepted solution]

I use "PingPlotter" you can set the TOS in the ICMP header.

HTH>

[cadet alain · Accepted solution]

Hi,

All Ping implementations  should be capable of setting ToS and so no need  for anything special.

Regards.

Alain.

[Kishore Chennupati · Accepted solution]

Hi gerard,

Alain is right. If you are looking at a windows machine then you should be able to see the various options

M:\>ping

Usage: ping [-t] [-a] [-n count] [-l size] [-f] [-i TTL] [-v TOS]
            [-r count] [-s count] [[-j host-list] | [-k host-list]]
            [-w timeout] target_name

Options:

    -t             Ping the specified host until stopped.

                   To see statistics and continue - type Control-Break;

                   To stop - type Control-C.

    -a             Resolve addresses to hostnames.

    -n count       Number of echo requests to send.

    -l size        Send buffer size.

    -f             Set Don't Fragment flag in packet.

    -i TTL         Time To Live.

    -v TOS         Type Of Service.

    -r count       Record route for count hops.

    -s count       Timestamp for count hops.

    -j host-list   Loose source route along host-list.

    -k host-list   Strict source route along host-list.

    -w timeout     Timeout in milliseconds to wait for each reply.

HTH,

regards

Please rafe if helpful

[Gerard Gacusan]

Great Help guys ... yeah i see it. Thanks all !

[andrew.prince]

By default ALL windows OS have that option disabled.  You need to change the registry to enable TOS options to ICMP.

You need to change the "DisableUserTOSSetting" to 0

[cadet alain]

Hi Andrew,

I've just tried with a Windows xp sp2 with registry untouched and it worked.

Regards.

Alain.

[Gerard Gacusan]

Are you guys using this setting from a Vista OS? Is it a Decimal value 1-255? Also, by default the registry is already set to 0. So, I guess nothing to worry about the reg DWORD value.

Examples:

c:\ping -v 46 x.x.x.x (EF Traffic)

c:\ping -v 10 x.x.x.x (AF11 Traffic)

Wondering what this message meant for - Type Of Service (IPv4-only. This setting has been deprecated
                   and has no effect on the type of service field in the IP Header).

C:\>ping

Usage: ping [-t] [-a] [-n count] [-l size] [-f] [-i TTL] [-v TOS]
            [-r count] [-s count] [[-j host-list] | [-k host-list]]
            [-w timeout] [-R] [-S srcaddr] [-4] [-6] target_name

-v TOS        Type Of Service (IPv4-only. This setting has been deprecated
                  and has no effect on the type of service field in the IP Head

[andrew.prince]

You need to use the TOS value which is required, DSCP * 4 = TOS

So in your examples - they need to change

c:\ping -v 184 x.x.x.x (EF Traffic)

c:\ping -v 40 x.x.x.x (AF11 Traffic)

HTH>

[Gerard Gacusan]

oh ok, let me try this one... i think this one work.Yeah i was wondering why i can't see those markings

[cadet alain]

Hi,

You have to multiply your  DSCP values by 4 because ToS is coded on 8 bits and DSCP on 6 bits so

EF is DSCP 46(decimal) so in binary with 6 bits 101110 and  it gives 10111000 (8+16+32+128 = 184) for ToS byte.

Regards.

Alain.