as numbers

Gaurab Raj Upadhaya gaurab at lahai.com
Mon Aug 1 17:26:37 UTC 2005


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>>
>> Anyone who uses the argument of inter-domain routing that are not  
>> seen by
>> any data collectors on the Internet should be pointed at RFC1930  
>> and told
>> to renumber their private ASNs.
>>
>
> Just because public route collectors can't see use of an ASN, that  
> doesn't mean the ASN isn't in use; just because it can't be seen  
> doesn't mean it's private-use: it might still feature on routes  
> announced on the Internet, even if the routes don't propagate  
> globally.
>
> For a trivial example of this, consider a multilat route server at  
> an exchange point. Unless you measure from within (or downstream  
> of) a peer of the route server, you'll never see the AS number in  
> an AS_PATH attribute. It's fairly clear to me that this is not a  
> suitable candidate for private-use numbering, however.
>

I can see that happening all over the place where external  
connectivity is pre-dominantly over satellite, or where there is a  
monopoly in transit services.  The ASN are used mainly at the local  
IXP, where RFC 1930 and private ASN won't be useful, but at the same  
time external connectivity is default routed to the transit provider.  
Thus the ASN are not seen in any AS_PATH by any data collector,  
doesn't mean that they are not being used.

thanks

            -- gaurab


/////////////////////////////////////////////////////+9779851038080
gaurab at lahai dot com

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