Random Linux and Raspberry Pi Stuff

[thewalrushole]

Salt on Raspberry Pi ARM64 - Ubuntu

Install

Install all the salt-minion dependencies

apt install dctrl-tools python3-pycryptodome python3-zmq python3-dateutil python3-msgpack python3-psutil python3-gnupg

Download the specific salt packages, for salt-minion we are going to need 2 of them: salt-minion and salt-common

Check for latest files, at the time of writting it was salt_common_3003 & salt-minion_303 http://repo.saltstack.com/py3/ubuntu/20.04/amd64/latest/

cd /tmp

wget http://repo.saltstack.com/py3/ubuntu/20.04/amd64/latest/salt-common_3003%2Bds-1_all.deb && wget http://repo.saltstack.com/py3/ubuntu/20.04/amd64/latest/salt-minion_3003%2Bds-1_all.deb

Install the packages

dpkg -i salt-common_3003... salt-minion_3003

Configure the minion.

[thewalrushole]

Site to Site VPN - OpenVPN on Asus Router (OE Firmware)

frkq Asus routers are painful, and open vpn isn't intuitive like a network appliance like a cisco router would work.

Most configuration is pushed server side including the satellite site routes.

ASUS OE firmware is dynamically generate each boot and apply so you have to work your configuration into the UI and jffs parition.

*Note I haven’t bother with security key authentication since its just a small test network

Topology

ASUS Router Headend 192.168.1.0/24

Ubuntu Raspberry PI Satelight. 192.168.200/24

UI

client-config-dir /jffs/openvpn/ccd      #jffs persistant partition  topology subnet client-config-dir ccd client-to-client username-as-common-name # Remote routes route 192.168.200.0 255.255.255.0 10.8.0.2 # These routes are pushed out to other connecting clients/site and hairpin via the headend push "route 192.168.200.0 255.255.255.0 10.8.0.1" #end

JFFS files *on the server side

filename -> site cn name

ifconfig-push 10.8.0.2 255.255.255.0

iroute 192.168.200.0  255.255.255.0

Satelight Client Config

topology subnet

route-metric 50

route 192.168.1.0 255.255.255.0

push "route 192.168.200.250"

push "route 192.168.200.0 255.255.255.0"

pull-filter ignore "route 0.0"

pull-filter ignore redirect-gateway

Running OpenVPN Client as a Service w PWD

/etc/systemd/system/openvpn-client.service

ExecStart=/usr/sbin/openvpn --suppress-timestamps --nobind --config /etc/openvpn/client.ovpn --auth-user-pass /etc/openvpn/login.conf

DNSMasq Forwarding Local Domain

Place autorun file on a usb drive to hack ASUS mount autorun script on boot.

/jffs/configs/dnsmasq.conf.add

server=/home.local/192.168.200.250

.asusrouter

#!/bin/sh

killall dnsmasq

cat /jffs/configs/dnsmasq.conf.add >> /etc/dnsmasq.conf

dnsmasq --log-async

[thewalrushole]

Distributed Wireless

A bunch of wireless access points running 802.11r in a bridged network, based on linux, hostapd, ect.

Objectives:

- distributed, redundant, optimised, converged coverage

Hardware:

Raspberry Pi 3B is ok for testing supporting either spectrum (2.4 or 5.0) in ht mode

SBC with dual concurrent radios to test .. Wally’s Communications DR6018 and DR6018-S V02

OS:

DD-WRT ( I really should revisit this, but seems like bloatware

Ubuntu server for ARM seems like a better option

Build:

apt-get install rfkill hostapd bridge-utils cpufrequtils dnsmasq htop lldpd sshpass wireless-tools 

remove snap from ubuntu

Netplan

Don’t need to configure wlan interfaces into the bridge hostapd will do this, loopback is a /32 from within the bridge lan range (linux is crap at strict routing so this will actually work), loopback duplicated on all AP’s for distributed DHCP, DNSMasq, ect

       version: 2

       renderer: networkd

       ethernets:

               eth0:

                       dhcp4: false

                       dhcp6: false

               lo:

                       match:

                               name: lo

                       addresses:

                               - 192.168.200.251/32

       bridges:

               br0:

                       dhcp4: false

                       dhcp6: false

                       addresses:

                               - 192.168.200.201/24

                       gateway4: 192.168.200.250

                       interfaces:

                               - eth0

Hostapd

country_code=NZ

interface=wlan0

bridge=br0

ssid=ssid here

auth_algs=1

macaddr_acl=0

ignore_broadcast_ssid=0

wpa=2

wpa_passphrase=password here

wpa_key_mgmt=WPA-PSK

wpa_pairwise=TKIP

rsn_pairwise=CCMP

hw_mode=a

wmm_enabled=1

iapp_interface=br0

okc=1

ieee80211n=1

require_ht=1

ht_capab=[MAX-AMSDU-3839][HT40+][SHORT-GI-20][SHORT-GI-40][DSSS_CCK-40]

ieee80211ac=1

ieee80211ac=1

require_vht=1

ieee80211d=0

ieee80211h=0

vht_capab=[SHORT-GI-80][SU-BEAMFORMEE]

vht_oper_chwidth=1

channel=36

#vht_oper_centr_freq_seq_idx=42

disassoc_low_ack=1

multicast_to_unicast=1

#proxy_arp=1

#rssi_reject_assoc_rssi=-75

#rssi_ignore_probe_request=-75

rssi_reject_assoc_timeout=10

mobility_domain=a1b2

nas_identifier=b827eb3b638c

r0_key_lifetime=10000

r1_key_holder=b827eb3b638c

reassociation_deadline=1000

#ft_over_ds=1

r0kh=ff:ff:ff:ff:ff:ff * 00112233445566778899aabbccddeeff

DNSMasq

port=53

domain-needed

resolv-file=/etc/resolv.dns

strict-order

server=/200.168.192.in-addr.arpa/192.168.200.250

address=/double-click.net/127.0.0.1

ipset=/yahoo.com/google.com/vpn,search

server=192.168.200.250@br0

interface=br0

Thinks to do

Docker and Openshift Origin

Salt Stack package and configuration management

sshd authentication allow non privilege users during startup/shutdown

pretty sure if I set the radius interface and nas identifier it will control which interface hostapd used for broadcast

cluster DHCP and DNSMasq if required

Clean up and format this blog

TCP multipath dual ip uplinks

wireless backhaul backup

QoS/WMM

build standard vlan on bridge interface (management lan, user, security ect)

build mutiple SSID to vlan

something like vrf to ensure segmentation of SSID/VLANS

Manage all this via salt.. and look into dbus remote send

move to WPA3 or Radius or something more secure

Zigbee and BT....

Wifi spectrum management (channel management/switching)

RF location services

DHCP PXE boot for future management of zigbee ect.

802.11ac dongle, onboard 5ghz radio and antenna are weak switched to 2.4(g) 

Do I

local cluster/bind9 <--> local dnsmasq 

local cluster/bind isc-dhcp-server <--> local dnsmasq

Why, bind9 able to look up root no fowarder required, and local entries for windows ect, but dnsmasq for fast caching .. is it overkill, bind9 is supposed to cache too in ram, but we want this highly available and fast

Same for dhcp fast/redundancy

References / Reading

http://www.routereflector.com/2016/11/working-with-vrf-on-linux/

https://www.raspberrypi.org/documentation/configuration/wireless/access-point-bridged.md

http://ftp.gwdg.de/pub/linux/linux-magazin/listings/raspberry-pi-geek.com/04/AccessPoint/Listing04.txt

https://www.linux.com/topic/networking/advanced-dnsmasq-tips-and-tricks/