[afnog] Help Please - is my ISP Stripping my prepends?

Fri May 30 11:08:45 UTC 2014

Hi Andrew,

I read the long thread started by you the other day about de-agregation, and am slowly working to understand all this.

We do not at this time connect to an IXP.

Best,

Alex

----- Original Message -----
> From: "Andrew Alston" <Andrew.Alston at liquidtelecom.com>
> To: "Alex Rhys-Hurn" <alex at itworx.co.ke>, "mark tinka" <mark.tinka at seacom.mu>
> Cc: afnog at afnog.org
> Sent: Friday, 30 May, 2014 12:48:31 PM
> Subject: RE: Help Please - is my ISP Stripping my prepends?
> 
> Hi Alex,
> 
> Just one other note.  If you are connected to an IXP and are de-aggregating
> your space in the manner suggested by Patrick, please, please, please ensure
> that all de-aggregates are also sent to the IXP in addition to any
> aggregates.
> 
> Failure to do so will compound a problem I discussed on the list recently and
> creates significant issues.
> 
> Thanks
> 
> Andrew
> 
> 
> -----Original Message-----
> From: afnog [mailto:afnog-bounces at afnog.org] On Behalf Of Alex Rhys-Hurn
> Sent: Friday, May 30, 2014 11:51 AM
> To: mark tinka
> Cc: afnog at afnog.org
> Subject: Re: [afnog] Help Please - is my ISP Stripping my prepends?
> 
> Hi Mark,
> 
> One Communications = Safaricom, they bought it years ago, havent updated
> whois db Yes a typo = 194.9.64.0/23
> 
> I have made some changes as per suggestion from Patrick Okui.
> 
> Many thanks for the link to Seacom LG. Been looking for something more local.
> 
> Alex
> 
> ----- Original Message -----
> > From: "Mark Tinka" <mark.tinka at seacom.mu>
> > To: "Alex Rhys-Hurn" <alex at itworx.co.ke>
> > Cc: afnog at afnog.org
> > Sent: Friday, 30 May, 2014 11:45:21 AM
> > Subject: Re: [afnog] Help Please - is my ISP Stripping my prepends?
> >
> > On Friday, May 30, 2014 10:16:35 AM Alex Rhys-Hurn wrote:
> >
> > > Announced as:
> >
> > From what I can see (using our [SEACOM's] looking glass located in
> > Mombasa, Kenya - you're welcome to use it too if you wish -
> > http://lg.seacomnet.com/):
> >
> > > 194.9.65.0/24 via Access Kenya with no prepend
> >
> > Router: lg-01-mba.ke
> > Command: show ip bgp 194.9.65.0/24
> >
> >
> > BGP routing table entry for 194.9.65.0/24, version 8691796
> > Paths: (1 available, best #1, table default)
> >   Not advertised to any peer
> >   Refresh Epoch 1
> >   37100 3741 15808 37166
> >     41.87.100.25 from 41.87.100.25 (41.217.212.5)
> >       Origin IGP, metric 0, localpref 100, valid, external, best
> >       Community: 37100:10362 37100:10901 37100:10902 37100:12009
> >       path 0D880D68 RPKI State not found
> >       rx pathid: 0, tx pathid: 0x0
> >
> > So yes, looks like there are no prepends here, as you say.
> >
> > > 194.9.64.0/24 via ISP1 prepended 3x
> >
> > Router: lg-01-mba.ke
> > Command: show ip bgp 194.9.64.0/24
> >
> >
> > BGP routing table entry for 194.9.64.0/24, version 7506326
> > Paths: (1 available, best #1, table default)
> >   Not advertised to any peer
> >   Refresh Epoch 1
> >   37100 33771 37061 37061 37061 37061 37061 37166
> >     41.87.100.25 from 41.87.100.25 (41.217.212.5)
> >       Origin IGP, metric 0, localpref 100, valid, external, best
> >       Community: 37100:10000 37100:10900 37100:12002 37100:20901
> >       path 12149280 RPKI State not found
> >       rx pathid: 0, tx pathid: 0x0
> >
> > This path looks like it's being prepended 4x times by
> > AS37061 (which looks like One Communications - not sure whether this
> > is a Safaricom subsidiary or customer).
> >
> > > 194.9.0.0/23 via Access Kenya with no prepend
> >
> > Router: lg-01-mba.ke
> > Command: show ip bgp 194.9.0.0/23
> >
> >
> > % Network not in table
> >
> > Was this a typo?
> >
> > > yes, as per your email, I am not seeing the expected behaviour from
> > > ISP 2 Safaricom. But now that I look again, I see paths to safaricom
> > > that are prepended (their AS 37061) being prepended 5x so my path is
> > > still shorter via my prepended path on Access Kenya. Should I just
> > > ramp up my prepending on Access Kenya?
> >
> > I guess the real question is if you are prepending your own AS to that
> > path, why is your provider overwriting it?
> >
> > The net effect is about the same, given the path is being prepended by
> > your provider anyway, but perhaps you want to chat to them about
> > whether you prefer they honour your own prepends.
> >
> > Cheers,
> >
> > Mark.
> >
> 
> --
> Alex Rhys-Hur n | ITworX Limited
> P.O. Box 1649, 00502, Karen, Kenya
> Tel: +254 (0) 20 2444824 | Cell: +254 (0) 724 972541
> Web: www.itworx.co.ke
> 
> 
> 
> 
> 
> 
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-- 
Alex Rhys-Hur n | ITworX Limited 
P.O. Box 1649, 00502, Karen, Kenya 
Tel: +254 (0) 20 2444824 | Cell: +254 (0) 724 972541 
Web: www.itworx.co.ke 