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Dialup Network In A Box

This is a self-contained, portable telephony network which allows us to connect and analog modems and ISDN adapters at retrocomputing events.

The setup (as of Q4/2019) consists of:
  • Auerswald COMmander Basic2 PBX with 8x S0 (ISDN BRI) ports, 16x a/b (analog) ports, 8x Up0 (ISDN) ports and 1x S2M (E1 ISDN PRI)
  • 1U Rack-Mount Atom PC with 4-port E1 (DAHDI) card and FreeSwitch: Emulates public telephone exchange
  • Livingston Portmaster 3 RAS with ability to terminate 30 ISDN or analog modem calls

Telephony Setup

The physical setup looks like this:

Logical Setup:

This shows the logical setup including PCs and associated software:

Pictures

Ethernet Switch configuration

We have an old 16-port gigabit ethernet switch (DELL PowerConnect 2716) in our setup.

VLAN 1 (admin)

  • Port 1: untagged
  • Port 7: PC eth1 (tagged)
  • Port 8: admin laptop (tagged)

VLAN 11 (admin)

This is a "jumper" from VLAN 1 (untagged) to VLAN 11 (tagged) as the switch doesn't natively support its web interface on a tagged IP

  • Port 4: untagged
  • Port 7: PC eth1 (tagged)
  • Port 8: admin laptop (tagged)

VLAN 3999 (uplink)

  • Ports 9..16
  • Port 8: admin laptop (tagged)

VLAN 4000 (auerswald)

  • Port 2: Auerswald (untagged)
  • Port 7: PC eth1 (tagged)
  • Port 8: admin laptop (tagged)

VLAN 4001 (PM3)

  • Port 3: PM3 (untagged)
  • Port 7: PC eth1 (tagged)
  • Port 8: admin laptop (tagged)

IP Network configuration

VLAN 1/11 (admin)

IP Host
192.168.2.1 dell2716 switch
192.168.2.100 admin laptop
192.168.2.254 atom1u

VLAN 3999 (uplink)

IP Host
DHCP atom1u

VLAN 4000 (auerswald)

IP Host
192.168.0.240 Auerswald Commander Basic2
192.168.0.254 atom1u

VLAN 4001 (PM3)

IP Host
192.168.3.1 Livingston Portmaster 3
192.168.3.100 telnet/rlogin host (atom1u)
192.168.3.254 default-gw (atom1u)
192.168.4.0/24 PPP lease pool
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