NAT Gateways of Switzernet offices in PSE-A and PSE-B

Modified on 2009-03-05 by Emin Gabrielyan

Created on 2009-02-27 by Emin Gabrielyan

Currently in our offices of PSE-A and PSE-B we use four different internet accesses. The two offices are linked with radio bridges. The internet accesses are provided via NAT routers. Only one NAT router (of Swisscom line) is configured as the DHCP server. The SIP phones and other dynamic address based devices are therefore using the Internet access of Swisscom. We still have problems accessing the 2^nd VTX line in PSE-B from PSE-A. On the other hand, from PSE-B we can access all four links.

Use the following scripts to changing the routes on your machines

You can change the routing on your machine by clicking on one of the links on the first line of the table below:

Change your computer routing now	PSE-A Swisscom	PSE-A VTX	PSE-A EPFL	PSE-B VTX
See the commands in the BAT file	[.bat.txt]	[.bat.txt]	[.bat.txt]	[.bat.txt]
Connect to the NAT gateway	http://192.168.1.1/	http://192.168.1.2/	http://192.168.1.12/	http://192.168.1.14/

Obviously, these scripts take effect only if you are on the Switzernet LAN in PSE-A or PSE-B.

Setting of the NAT router at 192.168.1.12

This router is connected to LAN on 2009-02-27. This router provides the LAN hosts the access to EPFL connection. DHCP is deactivated (as mentioned in abstract, DHCP is only on 192.168.1.1).

Use 192.168.1.2 as default gateway for forcing access via VTX PSE-A

This access offers 20Mbps downlink and 1Mbps uplink. We have a range of 16 IP addresses.

Go to Control Panel, Network and Internet Connections, Network Connections, Local Area Connection, Properties, Internet Protocol (TCP/IP). Change your default gateway. You can check your global IP address by searching in Google “my IP address” http://google.ch/search?q=my+ip+address:

Use 192.168.1.1 as default gateway for forcing access via Swisscom

Use 192.168.1.12 as default gateway for forcing access via EPFL

Further work

Document the access via VTX line of PSE-B

Free the IP addresses from 1 to 4 for gateways and re-document the LAN architecture

Document settings of each NAT router

Link to this document from your final document

Document the bridge connection with photos and with the configuration pages (saved as HTML and screenshots)

Responsible persons

Christian Lathion

Kerim Teboulbi

References

Introduction of the LAN architecture of offices of Switzernet in PSE-A and PSE-B:

http://switzernet.com/public/090227-switzernet-pse-lan/

http://unappel.ch/public/090227-switzernet-pse-lan/

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