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Forum Discussion

rickey1253's avatar
rickey1253
Follower
Jun 22, 2021

CM500-unblocking ports

I have installed Norton and contacted them because I could not use the VPN.  They ran a scan and suggested that I contact my Internet Provider and request that UDP Ports 500 & 4500 be unblocked.  Is this possible?

2 Replies

  • FURRYe38's avatar
    FURRYe38
    Guru - Experienced User
    Jun 22, 2021

    I would if the CM modem had a built in router however the CM is only a modem only. Nothing to configure on this modem.

    To Configure ports, you'll need to consult the mfr of your wifi router thats connecte to the CM modem for this. 

    • schumaku's avatar
      schumaku
      Guru - Experienced User
      Jun 22, 2021

      Beyond, some el-cheepo ISP assign Carrier Grade NAT (CGN; RFC6598)  or RFC1918 private IP addesses to your router ... this will prohibit using a VPN (or reach the address on an port).