Software projects/OS/Slackware/Advanced usage/Firewall

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Revision as of 06:44, 16 April 2012 by Linux-SWAT (talk | contribs) (→‎Network interfaces)
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Network interfaces

  • eth0 is the interface that shows up when you plug an USB to ethernet adapter. A list of compatible ones is located here.
  • wlan0 is the embedded Wi-fi interface.
  • wlan1 is the name of a Wi-fi dongle.
  • usb0 is the big USB port (not sure, may ne the first plugged).
  • usb1 is the small USB port (not sure).
  • there's also a bluetooth interface, but until now i never used it, so can't tell more about it.
  • These interface numbers may vary, depending which one you plug first.
  • The numbers can be fixed using the /etc/udev/rules.d/70-persistent-net.rules file.
  • This file is deleted at each shutdown. To make use of it, edit /etc/rc.d/rc.local_shutdown , and comment this line:
rm /etc/udev/rules.d/70-persistent-net.rules

into 

#rm /etc/udev/rules.d/70-persistent-net.rules

Firewall

  • I shipped some default firewall configurations for eth0, wlan0 and usb0. I generated them using the easy firewall generator.
  • I didn't test them as i use a router, so it's up to you to try it.
  • If you want to use a firewall, ie. for eth0, then do:
cp /etc/rc.d/rc.firewall.eth0 /etc/rc.d/rc.firewall
chmod +x /etc/rc.d/rc.firewall
/etc/rc.d/rc.firewall start

Gateway

  • To use the OP as a simple gateway
chmod +x /etc/rc.d/rc.ip_forward
/etc/rc.d/rc.ip_forward start

NAT Router

  • It also uses a /etc/rc.d/rc.firewall script.
  • I don't provide any because everyone have a different setup.
  • Create it yourself with the easy firewall generator.
  • Then save it as /etc/rc.d/rc.firewall and do this:
chmod +x /etc/rc.d/rc.firewall
/etc/rc.d/rc.firewall start

QoS

  • For now, a recompiled kernel is necessary.
  • A basic setting consists of packet mangling who changes the ToS field in the packets, through rc.firewall rules. A simple example:
iptables -A PREROUTING -t mangle -p tcp --sport ftp -j TOS --set-tos Minimize-Delay
iptables -A PREROUTING -t mangle -p tcp --dport ftp -j TOS --set-tos Minimize-Delay
iptables -A PREROUTING -t mangle -p tcp --sport ftp-data -j TOS --set-tos Maximize-Throughput
iptables -A PREROUTING -t mangle -p tcp --dport ftp-data -j TOS --set-tos Maximize-Throughput
  • A more advanced setup makes use of dedicated kernel modules. The most known is the outdated wondershaper.
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