Basic traffic shaping with tc on Slackware

1. Goal

Limit bandwidth or make a link more predictable with qdisc and simple rules.

2. Files and components involved

/sbin/tc
eth0
/etc/rc.d/rc.local

3. Operational flow

tc qdisc add dev eth0 root tbf rate 20mbit burst 32kbit latency 400ms
add command in rc.local

4. Operational verification

tc -s qdisc show dev eth0
iperf3 -c host
ping gateway

5. Practical notes

Apply network changes from a local console or with an emergency session ready, so you do not lose SSH access.

Every network change should have a rollback path ready: a second console, KVM access, or a temporary command to remove.

Quick checklist

[ ] Backup or copy of the existing configuration completed
[ ] Files and commands updated as expected
[ ] Local test completed successfully
[ ] Logs or final output verified
[ ] Rollback procedure documented

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