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Cable modem -> switch -> router and a SonicWall firewall

By porterj5
Aug 4, 2011
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  1. I need some assistance with our network at the office. We recently switched from having our data and voice being managed through a T1 and a phone server on site to having a cable modem and a virtual PBX.

    Previous set up was T1 Line -> Box from T1 provided -> one line to the phone server and a second line to a SonicWall Firewall which then went to a couple of dell switches.

    We have switched to a cable modem with 5 static IP's and a virtual PBX. Tech support for the PBX company suggested we configure our net work as follows.

    --->Router---> Switch that connects to all phones
    Cable Mode --> Unmanaged switch--|
    --->SonicWall--> Switch that connects to computers

    I configured the router for the phones and that works with no problems. But, when I configure the SonicWall with the information provided by our cable modem provider it worked but the SonicWall said it needed to restart after configuration so I clicked restart. Then the the internet connection wouldn't work and I couldn't get back into the SonicWall.

    After numerous attempts at powering down the SonicWall and switch I finally was able to access it again and then the connection disappeared and finally I got access back again and reset everything to how it was on the T1 line.

    The WAN setting on the SonicWall are as follows:

    SonicWALL WAN IP (NAT Public) Address: I set this to an IP address in the range provided and made sure it was different than the one in use by the router for the phones.

    WAN Subnet Mask: I set this to the subnet our provider sent listed

    WAN Gateway (Router) Address: I set this to the Gateway address our provider listed

    DNS Server 1 & 2: Set to what our provider sent over.

    There is also an option for LAN settings.
    SonicWALL LAN IP Address: I left this as it was
    LAN Subnet Mask: I set this to the subnet mask our provider listed.

    From reading the setup guide for the SonicWall everything seems to be correct but then I am not able to access it nor do we have an internet connection. The phones still work so there is connectivity to the modem.

    I also tried connecting directly to the SonicWall rather than through a switch with no success. Reseting seems to eventually work but I am not sure if that worked or if it was something else.

    I am not sure what additional information would be needed so if you need something else please let me know.

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