Internet Questions

Post any assorted internet questions here

Such as:

Question: How do I obtain a new IP Address?
DSL -> Re-authenticate your PPPoE session
Cable -> Change your WAN MAC address on your router/connected device

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5 Responses to Internet Questions

  1. Ana Lee says:

    How do you determine the best MTU for Cable internet

    • Nick says:

      MTU is set by the protocol and medium used.
      Ethernet: 1500
      PPPoE: 1492
      DOCSIS 3.1 now supports an MTU of up to 2000 bytes

      If jumbo frames are enabled on all routers between hosts then MTU can be up to 9000 bytes.

      If even one connection between hosts has a lower MTU than what is being transmitted, the previous router will either fragment the packet, or drop it and respond with an ICMP packet, indicating the MTU too large and what the new maximum MTU should be set to.
      Most internet routers drop the packet as fragmenting it is CPU intensive.

      It is best to leave your MTU at it’s connection default (usually 1500)

  2. Anonymous says:

    { *xx | [2-9]xx[2-9]xxxxxx | 1[2-9]xx[2-9]xxxxxx | 011x. | 911 }

  3. Anonymous says:

    Which MAC Address on my modem do I need to provide to my cable provider to be provisioned?
    Answer: HFC or CM MAC

  4. Anonymous says:

    Why is MTU on DSL different, will that cause issues, and how will that affect performance?

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