cancel
Showing results for 
Search instead for 
Did you mean: 
Ask a Question
For Australian Bushfire info please click here
Highlighted
Occasional Contributor RodneyArmour
Occasional Contributor

Google Wifi suggested set-up of your Sagemcom Gateway F@ST 3864OP

Hi all, I am sharing this for others so that if you have Google Wifi, the following instructions for a Sagemcom Gateway F@ST 3864 will allow your Google Wifi to operate to its full potential and for your UPnP and Port Forwarding to also work correctly (to enable remote access for Home Security etc).

 

 Sagemcom Gateway F@ST 3864OP Bridge Mode 2017-02-09 11:52 AM
GlynR
Optus Sagemcom in Bridge Mode (almost) For (semi-technical) people who want to get around the limitations of the crippleware Optus Sagemcom modem ... The ideal would be to replace the modem with a much better modem/router and just put the Sagemcom modem into the cupboard. However, if you want to use the home phone facility, Optus makes it almost impossible to dispense with their crippleware modem. In any case you need to keep the Sagemcom for when you have an internet problem and then you can reconnect it (before you contact Optus) to decide whether the problem was with your "real" modem or the NBN network. I've heard people asking about using the Optus Optus modem in bridge mode and then adding their own modem/router of choice but Optus don't support bridging and the home phone service would probably stop working if you did put the modem in bridge mode. So ... There is an easy way to (almost) get the modem into bridge mode. Turn off the WIFI in the Optus Sagemcom modem Connect the WAN port of your "real" modem to one of the Sagemcom's Ethernet ports Identify the MAC address of the WAN port on your "real" modem and reserve an IP address for that MAC address in the Sagemcom modem (Advanced Setup / LAN then ENABLE DHCP SERVER and click on ADD ENTRIES) Often the MAC address of the WAN port is printed on a label on the bottom of the router but you should also be able to see it if you go into the Sagemcom modem and choose DEVICE INFO and then DHCP Note that in my own network I have the Sagemcom modem set to IP Address 192.168.47.1 and not 192.168.0.1 (so that I can setup VPNs to other networks with the IP sdubnet of 192.168.0.x). So if the IP address of the Sagemcom is 192.168.0.1 then reserve the IP address of 192.168.0.2 for your "real" modem's WAN port MAC address). Now when you plug your real modem into the Sagemcom it's WAN IP address will always be 192.168.0.2 (but if you plug it into a different network with a different sub-net it will still work OK - much better than setting a fixed IP address in the "real" modem) Set the DMZ address in the Sagemcom modem to be 192.168.0.2 (Advanced Setup / NAT / DMZ Host) Now (almost) all network traffic should automatically go through to your "real" modem with no firewall issues from the Sagemcom modem In my case my modem of choice is a Fritzbox because it has better quality WiFi, it is more open with many more options AND it has a built in DECT phone base station. So I also connect the home phone socket on the Sagemcom modem to the phone input socket on the Fritzbox modem. The end result of this is that almost all of the functionality of the Fritzbox modem is now available as if it was the only modem/router in my setup - including the VOIP phone line being accessible from my DECT phones. The disadvantages? I am running two modem/routers with extra cabling which add extra failure points to my system I am wasting power because I am running the Sagemcom modem when I don't really want to do so. I have to have an extra power point. I had to supply an extra short network cable and an extra short phone cable between the two devices.
Tags (1)
3 Replies
Occasional Contributor qprsludger
Occasional Contributor

Re: Google Wifi suggested set-up of your Sagemcom Gateway F@ST 3864OP

Screen Shot 2017-08-15 at 10.22.55 am.png

0 Kudos
Reply
New Contributor Grumpyoldman
New Contributor

Re: Google Wifi suggested set-up of your Sagemcom Gateway F@ST 3864OP

Yes just received Sagemcom F@ST 3864AC modem and I am having trouble with 1 well 2 things. The first is I can't seem to reserve an IP address for my server or printer. When I go to the setup and click add I get a blank screen so does any person know the fix. secondly, I thought well no problem every time the server reboots to install updates 0 to 1 billion I can just log into my modem as I did with my Netgear and repoint to the new IP address for port forwarding BUT I don't see an address to log into the modem remotely. Does any person know how to log in? thank you

0 Kudos
Reply
New Contributor denz02
New Contributor

Re: Google Wifi suggested set-up of your Sagemcom Gateway F@ST 3864OP

To get the phone connected to the sagemcom and google wifi to work was to disable dhcp and wifi on the sagemcom device then unplugged in the wan cable from sagemcom and plugged it into the google wifi puck wan port and from the google wifi to the switch and then I connected from the switch to the sagemcom modem WAN port not ethernet port for the home phone to work it has been now been number of hours and all the wired and wireless devices work perfectly. I tried alternative ways luck putting google wifi into the sagemcom router dmz zone but it was flaky.   The only disadvantages is that it is sagemcom using electricity just for the phone to work.
To summarise
Step 1 on the sagemcom disable the DHCP and disable wireless
Step 2 Unplug the wan cable from the sagemcom and plug it in to the google wifi wan port
Step 3 Configure Google wifi device
Step 4 Plug in the lan cable from googel wifi ethernet port to the switch my home is hard wired so I have a switch 
Step 5 Plug into the sagemcom wan port lan cable to the switch
 

Step 6 put port forwarding for ports 5060 and 5061 in google wifi for optus router

Alternative for step 4 and step 5 just plug one end of the lan cable into the google wifi and the other end into the sagemcom wan port.
0 Kudos
Reply