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

[Alex Rhys-Hurn]

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