Hi fellow traffic-shapers,
I am implementing a Diffserv CORE router using Linux kernel 2.4.18. I used
this excellent website (http://www.opalsoft.net/qos/DS-38.htm) using AFHTB
as a starting basis for my EGRESS diffserv implementation - and all works
great so far!!!
But my project has an additional requirement. There are services running
locally on the router which are sending/receiving IP traffic also. These
services are leaving the DSCP set to 0x00. What I want to do is to mark
these packets with a specific DSCP value and then treat them as if they came
in from the INGRESS and apply the AFHTB QoS mechanism.... How I can I do
this?
To restate the scenario:
- I am a CORE diffserv router.
- I am using the AFHTB script on my EGRESS
- Traffic from LAN has DSCP set, all works great using the AFHTB script!
- Traffic generated within the router has no DSCP set, but I want to set the
DSCP values (based on a u32 filter) and THEN treat the packets just like the
packets coming in from the LAN.
- The problem is that the AFHTB script assumes the DSCP values are already
set, but for locally generated traffic they are not.
- As DSMARK is my root queue, I know I can "mark" the DSCP code just
before
handing the packet over to the egress interface using commands like
""tc
class change dev eth1 classid 1:1 dsmark mask 0x3 value 0xb8"". But
this
marking is being done AFTER the AFHTB has done all its work, and I want to
mark the DSCP values BEFORE applying the AFHTB QoS.
Any suggestions/ideas/resources are truly appreciated!
Scratching my head,
-Tony
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