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IP Subnet announced on more than one ASN.
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IP Subnet announced on more than one ASN.

Is it for say possible to announce identical IP space on more than one ASN.

For example... could I announce 1.0.0.0/24 on both google, and cloudflare at the same time.

It there rules against this?

Comments

  • jackbjackb Member, Host Rep
    edited November 2018

    You can, but just don't.

    Whatever you're trying to achieve, there's a better way that doesn't make it look like you're hijacking your own space. There's a reason nobody does this and it's because it is pointless and needlessly breaks things.

  • @jackb said:
    You can, but just don't.

    Whatever you're trying to achieve, there's a better way that doesn't make it look like you're hijacking your own space. There's a reason nobody does this and it's because it is pointless and needlessly breaks things.

    I am not looking to do it.

    I'm curious more over if one subnet, such as 1.0.0.0/24, will only be announced by one AS, and never anymore.

  • It depends on the owner. If it changes hands some one might reannounce it under a different ASN.

    It should never ever be announced under two different ones at the same time. If it is then some one is either a fucktard or trying to hijack it. Either way it's a tits up situation.

  • @AuroraZ said:
    It depends on the owner. If it changes hands some one might reannounce it under a different ASN.

    It should never ever be announced under two different ones at the same time. If it is then some one is either a fucktard or trying to hijack it. Either way it's a tits up situation.

    Alrighty, so I can fully expect that only one AS will announce a specific IP subnet?

  • Correct and if it isn't that way refer to the tits up statement.

  • LyphiardLyphiard Member, Host Rep

    @AlyssaD said:

    @AuroraZ said:
    It depends on the owner. If it changes hands some one might reannounce it under a different ASN.

    It should never ever be announced under two different ones at the same time. If it is then some one is either a fucktard or trying to hijack it. Either way it's a tits up situation.

    Alrighty, so I can fully expect that only one AS will announce a specific IP subnet?

    No, there are tens of thousands of subnets announced by more than one AS. Just take a look here: https://bgp.he.net/report/multi-origin-routes

  • @Lyphiard said:

    @AlyssaD said:

    @AuroraZ said:
    It depends on the owner. If it changes hands some one might reannounce it under a different ASN.

    It should never ever be announced under two different ones at the same time. If it is then some one is either a fucktard or trying to hijack it. Either way it's a tits up situation.

    Alrighty, so I can fully expect that only one AS will announce a specific IP subnet?

    No, there are tens of thousands of subnets announced by more than one AS. Just take a look here: https://bgp.he.net/report/multi-origin-routes

    That is what I was worried about.... Thanks.

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