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Table of Contents

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Network Overview

Information on the layout and configuration of the LAN & its machines, IP addresses and SSH tunnels, services etc.

External WAN Connection

ADSL

  • ISP : PlusNet
  • Host Name : gm4slv.plus.com
  • Static IP address : 80.229.223.86
  • Router : Netgear DG834G

••••••••••

Local LAN Login to Router : http://192.168.21.1

Firewall Holes & Port Forwards

PortProtocolServiceInternal MachineInternal IPComments
27659TCPSSHlaptop192.168.21.101SSH Backdoor - use SSH tunnels for wider internal access
5198-5199UDPEcholinkmb7aze192.168.21.105Echolink incoming connections
8073TCPOpenWebRXsdr192.168.21.108
42110TCPHTTPshack192.168.21.107Shack PC webserver for various experiments
4569UDPAll Starmb7aze_allstar192.168.21.105For incoming connections to All Star Link Node

Internal LAN

LAN Network

  • Network : 192.168.21.1 / 24
  • Gateway : 192.168.21.1
  • DHCP/DNS provided by ADSL router

Fixed LAN Hosts

HostLAN IPServicesCommentsOpen Ports
gate192.168.21.1WAN/Firewall/PortForwards/DNS/DHCP
shack192.168.21.107HTTP/SSH pico-itx box. webserver and radio digimode PC. Headless/VNC
laptop192.168.21.101SSHLenovo laptop. Main Shack user-PC. SSH landing point for external access
mb7aze192.168.21.105SSH, Echolink/SVXLinkRaspberry Pi
sdr192.168.21.108OpenWebRX/SSHRaspberry Pi
aprs192.168.21.6APRS IgateRaspberry Pi
dvmega192.168.21.119Pi-star DMR HotspotRaspberry Pi
switch2192.168.21.254TelnetHuawei Switch
svxremote-siteSSH, SVXLinkRaspberry Pi

hosts file

On all linux machines (and win10 laptop) - just change the 127.0.0.1 hostname to suit the machine 

127.0.0.1       localhost
127.0.0.1       laptop

# IP		FQDN			Alias
#
192.168.21.1    gate.twatt.home         gate
192.168.21.2    wap.twatt.home          wap

192.168.21.5    nas1.twatt.home         nas1
192.168.21.6    aprs.twatt.home         aprs
192.168.21.7    xgate.twatt.home        xgate

192.168.21.101  laptop.twatt.home       laptop

192.168.21.109  svx.twatt.home        	svx
192.168.21.107  shack.twatt.home        shack
192.168.21.108	sdr.twatt.home		sdr
192.168.21.105	mb7aze.twatt.home	mb7aze


192.168.21.253  switch.twatt.home       switch
192.168.21.254  switch2.twatt.home      switch2

Windows Host File

  • Start → Windows Accessories → Notepad → <right click> … more…Run as Administrator
  • edit C:\Windows\System32\drivers\etc\hosts (set All files rather than txt to be able to see the hosts file in the file chooser)
  • Save

Page Updated: 30/12/25 09:55 GMT

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