GlobalOS wiki

From NuclearCat's homepage

Contents 1 Installing GlobalOS 2 Updating GlobalOS 3 Network configuration 4 Assigning CoS fields to packets 5 hfsc usage example 6 1:1 NAT by iproute2 (not working yet?) 7 Serial console howto

Installing GlobalOS

(do not use this part, not finished yet)

• Download from http://www.globalos.info/globalos-install.bin

If you have Windows:

• Download http://m0n0.ch/wall/downloads/physdiskwrite-0.5.1.zip (software page: http://m0n0.ch/wall/physdiskwrite.php )
• Write image to USB stick or other media, physdiskwrite globalos-install.bin

If you have Linux:

• dd if=globalos-install of=/dev/yourmedia . Note, you need to specify device, not partition. For example /dev/sdc1 - WRONG, /dev/sdc - CORRECT.

Updating GlobalOS

Just run command

gs update

Network configuration

nano /config/network.cfg

Here is example of good network configuration:

#!/bin/sh
#I want name of my host GlobalOSRouter
hostname GlobalOSRouter

# DNS
echo "nameserver 2.2.2.10" >/etc/resolv.conf

#Flush all network addresses from interface
ip addr flush dev eth0

#Add ip 10.0.0.5 with netmask /24 (255.255.255.0) to interface eth0
ip addr add 10.0.0.5/24 dev eth0

#Bring interface up
ip link set eth0 up

#Add default route
ip route add default via 10.0.0.1

#Sync time with time server (not ntp!)
#rdate -s 2.2.2.10

#Save time to NVRAM
#hwclock -w

Why i am using flush? Because it is nice, if you want to change ip address, you just edit address and run

sh /config/network.cfg

System will be unreachable for short period of time (less than second), but then it will appear online!
If something went wrong, you just can reboot system, and old config will be back

If everything fine, you do

gs save

and tested configuration will be saved

If you just want to add temporary ip, do it by issuing commands by ssh, without altering network.cfg. For example:

ip addr add 10.0.1.1/24 dev eth1

Thats it. Sure when you reboot, all this changes will be lost.

Assigning CoS fields to packets

IFACE - some VLAN interface

vconfig set_egress_map ${IFACE} 3 3
vconfig set_egress_map ${IFACE} 2 2

tc filter add dev ${IFACE} parent 1: protocol ip u32 match ip protocol 1 0xff action skbedit priority 2
tc filter add dev ${IFACE} protocol ip pref 10 parent 1: u32 match ip src 1.2.3.4/32 action skbedit priority 3
tc filter add dev ${IFACE} protocol ip pref 100 parent 1: u32 match u32 0 0 action skbedit priority 0

hfsc usage example

DEV=eth0.2022
#DEV=eth0

ROOTRATE=118000


tc qdisc del dev ${DEV} root

tc qdisc add dev ${DEV} root handle 1: hfsc
## CLASS ##

## CLASS ## 1: ## 1:50 ##
tc class add dev ${DEV} parent 1: classid 1:50 est 1sec 8sec hfsc sc rate 95000kbit ul rate 95000kbit

tc class add dev ${DEV} parent 1:50 classid 1:51 est 1sec 8sec hfsc sc rate 30000kbit ul rate 95000kbit #newnet
tc class add dev ${DEV} parent 1:50 classid 1:52 est 1sec 8sec hfsc sc rate 27000kbit ul rate 95000kbit #worldnet

Other things same as htb

1:1 NAT by iproute2 (not working yet?)

tc filter add dev eth0 parent ffff: protocol ip prio 10 u32 match ip dst 1.2.3.4/32 flowid 1:1 action nat ingress 1.2.3.4 4.5.6.7

Serial console howto

Add to /config/rc.local

modprobe 8250_pnp
echo "" >>/etc/inittab
echo "tty4::respawn:/sbin/getty 9600 ttyS0" >>/etc/inittab
killall -1 init