• An IP4 question, if that's OK?

    From Björn Felten@2:203/2 to All on Fri May 3 21:46:31 2019
    Maybe this is totally OT here, but given the amount of traffic here recently maybe some of you can find the time to educate me?

    I've been given an IP4 number from my provider in the third of four /26 subnets. I.e. I have x.x.x.157 with a subnet mask of 255.255.255.192 and, of course, default gateway x.x.x.129

    I suppose the other 61 IP numbers in my subnet have been reserved mainly to my neighbours. Maybe not necessarily, but probably, no?

    If so, if I find out that one of the other 61 IP numbers was given to my neighbour friend, wouldn't it be possible to connect directly to his computer without having to go via the default gateway?

    Wouldn't that mean that we then can have direct fiber connection without the artificial speed restrictions that our respective subscription results in?

    Or am I totally out in the blue here? 8-)


    ..

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  • From TERRY ROATI@3:640/1321 to Björn Felten on Sat May 4 09:39:56 2019

    Download advanced IP Scanner, run a scan an see what it finds.

    Terry Roati

    On May 03, 2019 09:44pm, Bj”rn Felten wrote to All:

    Maybe this is totally OT here, but given the amount of traffic here recently maybe some of you can find the time to educate me?

    I've been given an IP4 number from my provider in the third of four
    /26 subnets. I.e. I have x.x.x.157 with a subnet mask of
    255.255.255.192 and, of course, default gateway x.x.x.129

    I suppose the other 61 IP numbers in my subnet have been reserved
    mainly to my neighbours. Maybe not necessarily, but probably, no?

    If so, if I find out that one of the other 61 IP numbers was given
    to my neighbour friend, wouldn't it be possible to connect directly
    to his computer without having to go via the default gateway?

    Wouldn't that mean that we then can have direct fiber connection
    without the artificial speed restrictions that our respective
    subscription results in?

    Or am I totally out in the blue here? 8-)


    ..

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    Terry - 3:640/1231 (tfb-bbs.org)

    ... Platinum Xpress & Wildcat!..... Nice!!!!
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    * Origin: The File Bank BBS! (3:640/1321)
  • From Victor Sudakov@2:5005/49 to Björn Felten on Sat May 4 11:25:26 2019
    Dear Bj”rn,

    03 May 19 21:46, you wrote to All:

    I've been given an IP4 number from my provider in the third of four
    /26 subnets. I.e. I have x.x.x.157 with a subnet mask of
    255.255.255.192 and, of course, default gateway x.x.x.129

    I suppose the other 61 IP numbers in my subnet have been reserved mainly to my neighbours. Maybe not necessarily, but probably, no?

    If so, if I find out that one of the other 61 IP numbers was given
    to my neighbour friend, wouldn't it be possible to connect directly to
    his computer without having to go via the default gateway?

    Wouldn't that mean that we then can have direct fiber connection without the artificial speed restrictions that our respective
    subscription results in?

    Many ISPs prevent direct (that is Layer 2) communication between residential customers, for various reasons. I would not be surprised if you and each of your neighbors are placed in personal VLANs or something like that.

    Victor Sudakov, VAS4-RIPE, VAS47-RIPN
    --- GoldED+/BSD 1.1.5-b20160322-b20160322
    * Origin: Ulthar (2:5005/49)
  • From Richard Menedetter@2:310/31 to Bj÷rn Felten on Sat May 4 12:46:10 2019
    Hi Björn!

    03 May 2019 21:46, from Björn Felten -> All:

    I've been given an IP4 number from my provider in the third of four
    /26 subnets. I.e. I have x.x.x.157 with a subnet mask of
    255.255.255.192 and, of course, default gateway x.x.x.129
    I suppose the other 61 IP numbers in my subnet have been reserved mainly to my neighbours. Maybe not necessarily, but probably, no?
    If so, if I find out that one of the other 61 IP numbers was given
    to my neighbour friend, wouldn't it be possible to connect directly to
    his computer without having to go via the default gateway?

    Nornally yes.
    But usually direct packets are filtered out.
    So in this case probably no.

    Just try to make an nmap scan of the network and see what you see ;)

    CU, Ricsi

    ... Consistency isn't always good especially if you're consistently wrong.
    --- GoldED+/LNX
    * Origin: First you take 16 habaneros... (2:310/31)
  • From Kees van Eeten@2:280/5003.4 to Bj÷rn Felten on Sat May 4 17:19:32 2019
    Hello Björn!

    03 May 19 21:46, you wrote to All:

    Wouldn't that mean that we then can have direct fiber connection without the artificial speed restrictions that our respective subscription results in?

    Or am I totally out in the blue here? 8-)

    A while ago I was looking at use cases for Vlan's. There was one article,
    about the fibre connections in Sweden. The distribution over the endpoint's
    was a network by itself, and the customers were channeled over Vlans all the
    way to the Radius server of their Provider of choise.

    I remeber to little to give a sound technical explanation.

    With some googleing you must be able to find the story.

    So I agree with Victor

    Kees

    --- GoldED-NSF/LNX 1.1.5-b20100318
    * Origin: As for me, all I know is that, I know nothing. (2:280/5003.4)
  • From Björn Felten@2:203/2 to Kees van Eeten on Sat May 4 17:59:54 2019
    So I agree with Victor

    After doing some intensive nmap scan, I tend to agree too. The ISPs seem to have all the loopholes covered... :(



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