Re: [LARTC] PRIO not working?

[jake@lucidpark.net (Jacob Elder)]

On Sun, Apr 14, 2002 at 12:26:05PM +0200, bert hubert wrote:
> On Sat, Apr 13, 2002 at 05:24:10PM -0400, Jacob Elder wrote:
> > I'm trying to prioritize interactive traffic over other traffic on my 56k
> > dialup link. I wrote some chains to set the ToS in PREROUTING and OUTGOING,
> > and I'm using a PRIO queue with three SFQ children:
> 
> PRIO works just fine - you probably have it configured wrong.

I'm sure it does for you guys, that's why I'm asking for help :)

> 
> > iptables -A OUTPUT -t mangle -p tcp --dport ftp-data -j TOS --set-tos Maximize-throughput
> 
> OUTPUT is only for locally generated packets, by the way. To mangle
> forwarded packets, use PREROUTING.

I know, I'm only worried about my one workstation at the moment.

> 
> > According to tcpdump, the ToS bits are indeed being set like I asked, but
> > "watch tc -s qdisc show dev ppp0" shows that everything is going into the
> > "througput" queue regardless. The only traffic that increments the counter
> > for the "interactive" queue is post-handshake SSH traffic, and from what
> > I've read, SSH sets the ToS explicitly. What am I doing wrong?
> 
> I would advise rechecking the output of tcpdump before and after applying
> the iptables mangle rules.

AIM traffic before:

140.186.55.23.33788 > 64.12.163.214.9898: tcp 68 (DF)

And after:

140.186.55.23.33788 > 64.12.163.214.9898: tcp 68 (DF) [tos 0x10] 

I forgot to mention that I'm running iproute 20010824-6 and kernel 2.4.17,
Debian Woody. Did the tc command lines I posted before look alright?

-- 
Jacob Elder
http://www.lucidpark.net/

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