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Thread: Fiber Connection

  1. #1
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    Fiber Connection

    Hi Philipi!

    Are there any specific settings for fiber connection internet?

  2. #2
    Administrator Philip's Avatar
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    Do you mean special settings in the TCP Optimizer ?
    Nothing special, just use the appropriate setting in the internet connection speed slider.

  3. #3
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    Philip,

    Can you recommend at good ONU (Optical Network Unit)? Something that would do Voice, Data & IPTV

  4. #4
    Administrator Philip's Avatar
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    It depends what your ISP supports, really. Usually they provide the ONU, and you get Cat5/Coax/phone jacks coming out of it where you can plug your NAT Router and devices. If your ISP lets you buy the ONU itself, they must have a list of units compatible with their system, and some type of specs, as in what connectors they use, wavelengths, etc. It is unusual for this to be left to the consumer.

  5. #5
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    Philip,

    Is it true that fiber internet packet size is capable of 1518 MTU?

  6. #6
    Administrator Philip's Avatar
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    It depends.. Theoretically yes, it is possible to have larger MTU values (jumbo frames for Gigabit LAN can be up to 9000bytes).

    However, you should have a consistent MTU across your visible network, so I would test by pinging with non-fragmented packets to see the largest possible MTU. The TCP Optimizer has that option, or you can do it from command prompt. If you do it in command prompt, you have to note that ICMP pings have 28-bytes of headers, while TCP/IP packets have 40 bytes of headers. (the largest non-fragmented ping-size for 1500 MTU would be 1472).

    In command prompt: ping -f -l 1472 speedguide.net

    To use a larger MTU, you'd have to have all your equipment (router, etc.) set for a larger size. If not, some router would have to fragment the packets and that extra work introduces delays/latency/issues.

  7. #7
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    I will experiment on larger mtu. Before I do that I have to change the default mtu of router as you have mentioned. How about in the OS level? I'm using windows 10? NIC interface? Shall I activate jumbo frames?

  8. #8
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    Did the experiment. after running tcp optimizer mtu test. It was suggested that maximum MTU is 1528. Changed MTU setting is OS level, Router and activating Jumbo frames in NIC as well as in the Router.

    Philip. I noticed that when I run the MTU test I only get 1 ping and 1 IP to be tested and it would immediately suggest a 1528 MTU. It would usually run 3 pings and multiple IPs. Is this a cause for concern?

  9. #9
    Administrator Philip's Avatar
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    Could be... I am not sure why it is only doing one, you may want to run the program as Administrator and try again. There are different settings in the dialog as well.

    You can also try the command-prompt ping to verify it.

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