I don't know on the IP Office limits on tunnels. I would suggest you don't use it for tunnels mainly because it cost a fortune to use the vpn tunnels on the ip office itself. Its much cheaper to buy an external router to do the vpn tunnels.
The IP Office with a third party device can connect tons of seperate sites depending on how many vpn tunnels the 3rd party hardware you use supports.
I've installed an 8 site setup. Just make sure routing is setup correctly.
IP Office supports four simultanous L2TP/IPSec tunnels.
L2TP does not require a license, IPSec is licensed.
In your case you can do with the IPO tunneling, SCN requires a star configuration.
You will have one IPO connecting to the other four so only four tunnels are needed.
You can always give it a try, if it doesnt work as expected then you can use third party routers.
can l2tp tunneling be setup to ipo's behind nat firewalls? if so how?
Also can l2tp be used with dynamnic ip's?, that is remote systems in a star config have a dynamic ip but still initiate a tunnel to the ipo? Is there a persitant setting?
If the IP changes your tunnel will go down. See if the providor will assign static addressing. Thats the only way to be sure you will have a stable running system, unless you have someone on standby to be able to change the addresses at each site when the dhcp lease is up. Depending on the providor, it may never change unless the Broadband modem is unplugged for any extended period of time or they upgrade or reboot their equipment at the C.O.
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