Problem setting DSCP value

I would like to set the DSCP value of ALL traffic coming in on eth0
going from a source (10.175.1.6) to a destination (10.175.2.2) to a
certain value (14). To do this, I used the following command:

iptables -t mangle -A PREROUTING -i eth0 -s 10.175.1.6 -d 10.175.2.2 -
j DSCP --set-dscp 14

With Wireshark, I see that only TCP, H.245, and H.225.0 packets have a
DSCP value of 14. RTP, RTCP, and H.263 still have a DSCP value of 0.

How can I set the DSCP value of ALL packets to 14?

On May 20, 4:00*am, Washington Ratso <jobhunt...@aol.com> wrote:
> I would like to set the DSCP value of ALL traffic coming in on eth0
> going from a source (10.175.1.6) to a destination (10.175.2.2) to a
> certain value (14). To do this, I used the following command:
>
> iptables -t mangle -A PREROUTING -i eth0 -s 10.175.1.6 -d 10.175.2.2 -
> j DSCP --set-dscp 14
>
> With Wireshark, I see that only TCP, H.245, and H.225.0 packets have a
> DSCP value of 14. RTP, RTCP, and H.263 still have a DSCP value of 0.
>
> How can I set the DSCP value of ALL packets to 14?

Did you try to put in POSTROUTING or FORWARD chains?

FYI: http://www.linuxhomenetworking.com/w...WDSY-MDA4o.gif
http://jengelh.medozas.de/images/nf-packet-flow.png

Regards,
Seenu.