source: trunk/lvs/debian/config/etc/network/if-up.d/iptables @ 1199

#!/bin/sh
## Joe Presbrey <presbrey@mit.edu>
## Quentin Smith <quentin@mit.edu>
## SIPB Scripts LVS Firewall marks

iptables -F -t mangle

# Create a table for regular scripts hosts
iptables -t mangle -N scripts 2>/dev/null || :

# scripts-vhosts.mit.edu
iptables -A PREROUTING -t mangle -d 18.181.0.46 -j scripts
# scripts.mit.edu
iptables -A PREROUTING -t mangle -d 18.181.0.43 -j scripts
# scripts-cert.mit.edu
iptables -A PREROUTING -t mangle -d 18.181.0.50 -j scripts

# Send Apache-bound traffic to FWM 2 (load-balanced)
iptables -A scripts -t mangle -m tcp -m multiport -p tcp --dports 80,443,444 -j MARK --set-mark 2
# Send SMTP-bound traffic to FWM 3 (load-balanced)
iptables -A scripts -t mangle -m tcp -p tcp --dport 25 -j MARK --set-mark 3
# Send finger-bound traffic to FWM 255 (the LVS director itself)
iptables -A scripts -t mangle -m tcp -p tcp --dport 79 -j MARK --set-mark 255
# Send everything else to FWM 1 (primary)
iptables -A scripts -t mangle -m mark --mark 0 -j MARK --set-mark 1

# webzephyr.mit.edu is special because its SMTP needs to always go to the primary (FWM 1)
iptables -A PREROUTING -t mangle -m tcp -m multiport -p tcp -d 18.181.0.49 --dports 80,443,444 -j MARK --set-mark 2
iptables -A PREROUTING -t mangle -m mark --mark 0 -d 18.181.0.49 -j MARK --set-mark 1