Re: [LARTC] PRIO not working?

[bert hubert <ahu@ds9a.nl>]

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.

> 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.

> 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.

Regards,

bert hubert

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