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jedi5's avatar
jedi5
Aspirant
Sep 22, 2018

Help: CM600 No Internet Connection??

Hi everyone.

 

Hope someone might be able to chime in with some suggestions and help me out.

 

Have Xfinity Internet and should be getting 250Mbit for speed. 

I'm getting a good 85-93ish max.

Had an Xfinity tech come out and he couldn't figure out the problem.

 

Have the CM600 with firmware V1.01.16.

 

If I connect directly from modem to my Imac, I get no internet connection at all.

 

If I connect from modem to Airport Extreme to Imac, I get internet. 

 

My patch cables are good, they aren't the problem.

I've tried quite a few different cables and they all work.

I've reset the modem quite a few times.

I've completely cycled down the modem for hours.

 

When I try to connect directly using ethernet cable from modem to imac, no internet.

When I connect directly using same ethernet from from modem to router to computer, I get internet.

 

Can someone help out and tell me if I have missed a step or there are some settings I should look at?

 

Thanks!

 

 

Troubleshooting

10 Replies

  • vkdelta's avatar
    vkdelta
    NETGEAR Employee Retired
    Sep 22, 2018

    Hi,

    Pls post your event log and Connection table.

     

    thanks

    • jedi5's avatar
      jedi5
      Aspirant
      Sep 23, 2018

      I hope I did this correctly.

      This information is modem to router to computer.

       

  • vkdelta's avatar
    vkdelta
    NETGEAR Employee Retired
    Sep 23, 2018

    power levels are ok. 

     

    for no internet on your iMAC --> 

    1. If you change from airport extreme to iMAC with an ethernet cable, Please make sure to reboot the modem

    2. Also, I think your iMAC may not been configured with DHCP mode causing this issue. Please check this. If you think, it is good, then provide output of "ifconfig" command from terminal app on iMac

     

     

    for speed issue> check the speed of direct connection

     

    if still open, This is most likely wrong bootfile issue. Please call comcast and ask them to send correct 250 Mbps bootfile.

    • jedi5's avatar
      jedi5
      Aspirant
      Sep 23, 2018

      1. Yes, I have rebooted, reset, cycled down the modem.

      Nothing seems to work.

      Only time modem works is when it is connected to router.

       

      How do I check speed of direct connection? 

       

      2. How should the iMac be configuered with DHCP mode? I just checked only I don't know what I should be looking at.

      Here is the output of the ifconfig:

       

      Last login: Sat Sep 22 08:33:32 on console

      rafis-iMac-4:~ hejo$ ifconfig

      lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384

      options=1203<RXCSUM,TXCSUM,TXSTATUS,SW_TIMESTAMP>

      inet 127.0.0.1 netmask 0xff000000 

      inet6 ::1 prefixlen 128 

      inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1 

      nd6 options=201<PERFORMNUD,DAD>

      gif0: flags=8010<POINTOPOINT,MULTICAST> mtu 1280

      stf0: flags=0<> mtu 1280

      OHC6: flags=0<> mtu 0

      OHC4: flags=0<> mtu 0

      EHC36: flags=0<> mtu 0

      EHC38: flags=0<> mtu 0

      en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500

      options=27<RXCSUM,TXCSUM,VLAN_MTU,TSO4>

      ether 00:26:bb:5e:34:1a 

      inet6 fe80::18ed:7ae1:acf1:aaca%en0 prefixlen 64 secured scopeid 0x8 

      inet 10.0.1.58 netmask 0xffffff00 broadcast 10.0.1.255

      nd6 options=201<PERFORMNUD,DAD>

      media: autoselect (100baseTX <full-duplex,flow-control>)

      status: active

      en1: flags=8823<UP,BROADCAST,SMART,SIMPLEX,MULTICAST> mtu 1500

      ether 04:1e:64:ee:2b:8e 

      nd6 options=201<PERFORMNUD,DAD>

      media: autoselect (<unknown type>)

      status: inactive

      en3: flags=8822<BROADCAST,SMART,SIMPLEX,MULTICAST> mtu 1500

      ether 7a:d7:5f:1f:dc:21 

      media: autoselect (none)

      status: inactive

      fw0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 4078

      lladdr 00:26:bb:ff:fe:5e:34:1a 

      nd6 options=201<PERFORMNUD,DAD>

      media: autoselect <full-duplex>

      status: inactive

      p2p0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> mtu 2304

      ether 06:1e:64:ee:2b:8e 

      media: autoselect

      status: inactive

      utun0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 2000

      inet6 fe80::150c:599:88a5:45e6%utun0 prefixlen 64 scopeid 0xd 

      nd6 options=201<PERFORMNUD,DAD>

      rafis-iMac-4:~ hejo$