Is there a standard prefix length most providers filter on, or is there a way to find out what each provider filters on? We have been assigned a /22 and are wondering if we will have any issues with this block. --------------------------------- Fussy? Opinionated? Impossible to please? Perfect. Join Yahoo!'s user panel and lay it on us.
On 19 Sep 2007, at 06:22, chk 543 wrote:
Is there a standard prefix length most providers filter on, or is there a way to find out what each provider filters on? We have been assigned a /22 and are wondering if we will have any issues with this block.
There are no hard and fast rules, but a general rule is the more you de-aggregate the more problems you are going to have, so unless you have a very good reason not to, announce the /22 and nothing longer. Best wishes, Andy Davidson.
On Wed, Sep 19, 2007 at 09:03:35AM +0100, Andy Davidson wrote:
On 19 Sep 2007, at 06:22, chk 543 wrote:
Is there a standard prefix length most providers filter on, or is there a way to find out what each provider filters on? We have been assigned a /22 and are wondering if we will have any issues with this block.
There are no hard and fast rules, but a general rule is the more you de-aggregate the more problems you are going to have, so unless you have a very good reason not to, announce the /22 and nothing longer.
...and if you think you have "a reason" to do so, carefully consider if the shorter prefix needs to be visibly globally or not. If you still are intent on deaggregating on a global scale and wish to guarantee no problems, send the deaggregates in addition to the aggregate such that you will still be visible to more-specific filters. Cheers, Joe -- RSUC / GweepNet / Spunk / FnB / Usenix / SAGE
participants (4)
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Andy Davidson -
chk 543 -
Joe Provo -
Raymond Macharia