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Frontier DSL modem and Sophos UTM

CoryWilliamson

Hello all

 

I need some help setting up a SG105 to work with the DSL modem at a customer site. I set the WAN interface to PPPOE filed in the frontier provided user and password. I then set the modem to bridge mode. I connect the DSL ethernet to the WAN port and the LAN port to the switch. I get nothing. I'm at a loss as to what to do next. 

The other thing I was wondering is if it is possible to leave the modem in non-bridge mode and configure the WAN port from there. Not sure if thats a good way to do it or not.

Any help is greatly appreciated!



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    Hi Cory, I used to have dsl at home long time ago so some of the stuff may not be current. First, did you notice anything in your pppoe log?

    You basically have two choices

    Choice 1. Leave modem as it is and either use modem as dhcp to assign address to your WAN interface on SG105 or you can use static IP address if you like. Problem is that your modem will NAT traffic and then your SG device will NAT it once again. This is not considered optimum configuration for most people and that is why they bridge the modem. I never ran into problems with this configuration and even had some servers running in my lab that worked fine with double NAT. But the keyword here is I was using it in my lab[:P]

    Choice 2. Bridge the modem like you have. Set the IP of your modem to something that you are not using inside your network (non routable). Set your pppoe interface like you already have. Now login to webadmin and go to interfaces ->additional address and add an additional address in the same subnet as your modem. This way you can access your modem that is bridged and UTM will still do the ppoe traffic. This is the preferred method since all incoming and outgoing traffic will be controlled by UTM.

     

    I would go with choice 1 till everything is working and then switch to choice 2 so that UTM is handling ALL your incoming and outgoing traffic.

     

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  • 0

    Hi Cory, I used to have dsl at home long time ago so some of the stuff may not be current. First, did you notice anything in your pppoe log?

    You basically have two choices

    Choice 1. Leave modem as it is and either use modem as dhcp to assign address to your WAN interface on SG105 or you can use static IP address if you like. Problem is that your modem will NAT traffic and then your SG device will NAT it once again. This is not considered optimum configuration for most people and that is why they bridge the modem. I never ran into problems with this configuration and even had some servers running in my lab that worked fine with double NAT. But the keyword here is I was using it in my lab[:P]

    Choice 2. Bridge the modem like you have. Set the IP of your modem to something that you are not using inside your network (non routable). Set your pppoe interface like you already have. Now login to webadmin and go to interfaces ->additional address and add an additional address in the same subnet as your modem. This way you can access your modem that is bridged and UTM will still do the ppoe traffic. This is the preferred method since all incoming and outgoing traffic will be controlled by UTM.

     

    I would go with choice 1 till everything is working and then switch to choice 2 so that UTM is handling ALL your incoming and outgoing traffic.

     

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