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Internet Access Russian Dolls

I was stunned when I've figured out my ISP uses PPP-over-Ethernet in FTTH environment. After the initial shock, the solution started to look more promising.

Read the whole article in Fragments, the official NIL blog


  1. Modern switches can use "option 82" to pass customer port number and "switch id" to DHCP-server. Dynamic ARP inspection and IP source guard can prevent "packet injection".

  2. IP over Avian Carriers is classical "long-haul" technology. For shorter distance RFC 1926 is better choice.

  3. Well, I'm a bit surprised that you are surprised about this... ;-)
    Here in Germany, Deutsche Telekom provides its customers FTTC-based VDSL-lines with IP-DSLAM's, so this is quite compareable, and they use PPPoE too.
    Honestly, I don't even know if any ISP uses DHCP for access lines here in Germany... (nearly 99,99% use PPP, PPPoE and / or PPPoA I guess)
    Another argument for this solution is that you can easily deploy MPLS-VPN's using the same concept. You just have to add a RADIUS-Attribute...

  4. like you say in fragments, much better for security

    the sad thing is, how many people are going to be running these connections on little crappy home-use routers whose cpu maxes out at 8-10mbps?

  5. This opens the market for dedicated high performance PPPoE optimized network adapters. :)

  6. @visir: Thanks. I learn something new every day :)

    @A#1: Definitely a better choice for Metro service. But I guess we need a newer version of the standard. If we'd switch to ultrasound (avoiding the range used by bats to decrease background noise), we could drastically increase the transmission speed.

    @A#2: I'm not surprised. Now I also know where my SP got this bright idea.

    @A#3: You're right ... but in the end, the SP always wins. They give you low-cost crappy router that cannot saturate the link you're paying for, so they lower the overall utilization.

    @A#4: I don't think this is an issue on any decent PC/workstation.

    And, please, would you finally start using nicknames. Trying to sort out replies to four anonymous commenters is not fun :D

  7. By "dedicated high performance PPPoE optimized network adapter" I mean PCI Express ten gigabit ethernet card with hardware acceleration for PPPoE able to transmit/receive and processing PPPoE frames at the full wirespeed. :)


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