noctorum's questions

In traffic control, will an explicit parent declaration in a filtering rule override a flowid definition? E.g.;

tc qdisc add dev eth0 root handle 1: htb default 20

tc class add dev eth0 parent 1: classid 1:1 htb rate 200mbit ceil 200mbit
tc class add dev eth0 parent 1:1 classid 1:10 htb rate 80mbit ceil 200mbit
tc class add dev eth0 parent 1:1 classid 1:20 htb rate 80mbit ceil 200mbit

tc filter add dev eth0 protocol ip parent 1:0 prio 1 u32 match ip src 192.168.1.1/32 flowid 1:10

What would be the practical effect of that rule having the root qdisc defined as a parent? Would it cause flowid 179:10 to not share bandwidth?

What is the difference between the HTB rate and Ceil values?

I'm hosting a portion of a website for a client, and sending e-mails from their primary domain from a server in my network. Proper SPF records are in place for this, but SPF checking is still failing.

SPF seems to be checking the Return-Path: header, which is currently showing up as serverusername@serverhostname. The server hostname uses an internal tld and means nothing to the outside world. The mail sending script is written in perl, and I tried passing a different return path value to sendmail via the -f flag, and also by explicitly adding a Return-Path: header. Both methods have resulted in no change to the Return-Path:.

How can I change the Return-Path: in sendmail to the from e-mail address of the e-mail I'm sending so SPF passes?

Update:

Here are the contents of /etc/mail:

access
access.db
domaintable
domaintable.db
helpfile
local-host-names
mailertable
mailertable.db
Makefile
sendmail.cf
sendmail.cf.orig
sendmail.cf.rpmnew
sendmail.mc
submit.cf
submit.mc
trusted-users
virtusertable
virtusertable.db