Transfer of public IP addresses of VTX to PSE-B office
Emin Gabrielyan, Christian Lathion
Updated on 2009-07-23
Created on 2009-07-17
As of today, we already routed a subnet of 8 public IP addresses in PSE-B required for installation of test Porabilling master, slave, and PortaSIP server.
VTX provides us a range of 16 IP addresses 212.147.8.96/28 in PSE-A.
We divided this range into two ranges of 8 IP addresses (212.147.8.96/29 and 212.147.8.104/29) for using in PSE-A and PSE-B respectively.
Assignment of IP addresses in the first range:
212.147.8.96 is the address zero of the range (cannot be assigned to a host)
212.147.8.97 reserved by VTX (cannot be used)
212.147.8.98 is the LAN interface of the VTX router
212.147.8.99 is the NAT router of office LAN (192.168.1.2 from the side of the office LAN)
212.147.8.100 is the NAT router of test SIP phones
212.147.8.101 is the gateway in PSE-A for routing the 8 IP addresses to PSE-B
212.147.8.102 is free
212.147.8.103 is the broadcast address (cannot be assigned to a host)
Assignment of IP addresses in the second range:
212.147.8.104 is the address zero of the range (cannot be assigned to a host)
212.147.8.105 is the address of the router to be installed in PSE-B
212.147.8.106 is free (reserved for PortaBilling master)
212.147.8.107 is free (reserved for PortaBilling slave)
212.147.8.108 is free (reserved for PortaSIP)
212.147.8.109 is free
212.147.8.110 is free
212.147.8.111 is the broadcast address (cannot be assigned to a host)
Network diagram:
The diagram below shows the designed configuration for routing of public IP addresses. The boxes are clickable. Boxes 192.168.1.21 and 192.168.1.22 are the non-NAT gateways for routing the public IP addresses to PSE-B. Down-routing indications are in red, up-routing indications are in green.
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Remarks
Router 192.168.1.22 has the IP address 192.168.1.22/24 on its WAN interface and the IP addresses 212.147.8.105/29 on its LAN interface.
Router 192.168.1.22 routes 212.147.8.96/29 to 192.168.1.21 via its WAN interface, but it is not necessary because there is a default up-routing to 192.168.1.21.
Gateway 192.168.1.14 has a MAC address 00:23:69:65:96:DF on its LAN interface.
Wireless bridge 192.168.1.11 has a MAC address clone of 00:23:69:65:96:DF.
If MAC clone can be avoided in the wireless bridge, we then do not need the routing of 212.147.8.104/29 in 192.168.1.14.
Currently all IP addresses of PSE-B are seen under the same MAC address of 192.168.1.14.
Further work
Unnecessary routing of 212.147.8.96/29 must be removed in 192.168.1.22.
Gateway 192.168.1.14 must route the entire subnet of 16 IP addresses (and not only its half) to 192.168.1.22 such that 8 public IP addresses of PSE-A will be accessible from PSE-B without a “trip around the world”.
We must attempt removing the MAC address cloning on bridge 192.168.1.11 and see if true MAC addresses of PSE-B will become visible from PSE-A, and if we can directly pass via two routers 192.168.1.14 and 192.168.1.22 from PSE-A.
References
Transfer of 8 public IP addresses of VTX from PSE-A to PSE-B (this page)
http://switzernet.com/public/090717-vtx-pse-lan/
http://unappel.ch/public/090717-vtx-pse-lan/
Wireless LAN between PSE-A and PSE-B
http://unappel.ch/public/090227-switzernet-pse-lan/
http://switzernet.com/public/090227-switzernet-pse-lan/