[OpenSIPS-Users] can mediaproxy relay set IP ToS

[Dan Pascu]

On 3 Nov 2009, at 17:37, Jeff Pyle wrote:
>>> Is it possible to configure mediaproxy, or iptables or that matter,
>>> to mark
>>> the relay's outgoing packets with a specific ToS value?
>>> Unfortunately some
>>> up of my upstream providers strip the DSCP tags coming in and I'd
>>> like to
>>> take the opportunity at the relay to remark them with EF (0x2E).
>>
>> Not ATM. The support for marking the packets that pass through the
>> conntrack rules is there, it's just not used yet.
>
>
> Is there any conceivable way with a mangle rule to mark any udp  
> packets
> within the relay's port range leaving the interface to have a  
> certain DSCP
> value?  For example, in my case, everything leaving eth1 within  
> 16384-32768
> I'd like to mark EF.  I looked at some iptables documentation and  
> did some
> tests but I wasn't able to come up with anything that did the job.

I guess you can use iptables to mark all the packets that arrive on  
the mediaproxy ports with a flag and then use iptables to set the TOS  
value when they leave. Or it could be probably done in a single step:  
set the TOS value on all the packets arriving on the mediaproxy port  
range. I just don't remember how exactly this is done. You'll have to  
consult the iptables man page.

What I mentioned in mediaproxy would have done just this (when  
implemented), only it would be more precise: i.e. it would only mark  
the mediaproxy related packets, while the static iptables rule method  
may set the TOS value on non-mediaproxy packets if they happen to be  
in range.

--
Dan