[126140] in North American Network Operators' Group

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Re: MikroTik strikes again ?

daemon@ATHENA.MIT.EDU (Bret Clark)
Mon May 3 06:46:54 2010

Date: Mon, 03 May 2010 06:44:53 -0400
From: Bret Clark <bclark@spectraaccess.com>
To: nanog@nanog.org
In-Reply-To: <00df01caeaac$d4dc43c0$7e94cb40$@org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org

Tim Warnock wrote:
>> Adrian M wrote:
>>     
>>> MikroTik strikes again ?
>>>
>>> %BGP-6-ASPATH: Long AS path ... 39412 39625 39625 39625 39625 39625
>>> 39625 39625 39625 39625 39625 39625 39625 39625 39625 39625 39625
>>>       
>> From: Bret Clark [mailto:bclark@spectraaccess.com]
>> Sent: Monday, 3 May 2010 8:26 PM
>> To: nanog@nanog.org
>> Subject: Re: MikroTik strikes again ?
>>
>> Uhm....okay...but why does anyone prepend their ASN that much? Are you
>> saying the Mikrotik did that on purpose?
>>
>>     
>
> MikroTik asks for an amount of prepends rather than what ASN to prepend
> with.
>
> There was a bug in an old version that would modulus the ASN with 256 and
> prepend that many times.
>
> In this case 39625 modulo 256 = 201 prepends.
>  
>
>
>   
Yeah...guess I see why that would be a problem.

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