Is 213.215.28.0/23 (AS 49463) announced through AS 12670 and AS 13193

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1

Hi,

I did set-up this netblock behind two pipes.

One on AS13193 (which is working flawlessy), and ahother on AS12670 (which I doubt of).

Can please any of you tell me if from your location 213.215.28.0 is reachable through AS12670 ?

Thanks

Laurent

2

Hi Laurent,

I did set-up this netblock behind two pipes.

One on AS13193 (which is working flawlessy), and ahother on AS12670
(which I doubt of).

Can please any of you tell me if from your location 213.215.28.0 is
reachable through AS12670 ?

We, Novso AS25358, see only your route through Nerim AS13193.

frpar-msr4>sh ip bgp 213.215.28.0
BGP routing table entry for 213.215.28.0/23, version 16779890
Paths: (3 available, best #3, table Default-IP-Routing-Table)
  Not advertised to any peer
  13193 49463
    194.68.129.181 from 194.68.129.181 (194.79.131.249)
      Origin IGP, metric 240, localpref 200, valid, external
      Community: 25358:2000 25358:2020 25358:7000 25358:8000 25358:9000
  13193 49463, (received-only)
    194.68.129.181 from 194.68.129.181 (194.79.131.249)
      Origin IGP, metric 100, localpref 100, valid, external
  13193 49463, (received & used)
    195.140.149.5 (metric 200) from 195.140.149.5 (195.140.149.5)
      Origin IGP, metric 200, localpref 200, valid, internal, best
      Community: 25358:2000 25358:2050 25358:7000 25358:8000 25358:9000

Our peering session with Completel AS12670:
frpar-msr4>sh ip bgp sum | i 12670
194.68.129.188 4 12670 104682 103276 19335046 0 0 1d08h
195
frpar-msr4>sh ip bgp nei 194.68.129.188 received-routes | i 213.215.28.0
frpar-msr4>

Our peering session with Nerim AS13193:
frpar-msr4>sh ip bgp sum | i 13193
194.68.129.181 4 13193 103945 103222 19335046 0 0 1d08h
33

frpar-msr4>sh ip bgp nei 194.68.129.181 received-routes | i 213.215.28.0
* 213.215.28.0/23 194.68.129.181 100 0 13193 49463
i
frpar-msr4>

Completel AS12670 don't announce your route 213.215.28.0/23 to their
peers so your route is only visible through Nerim AS13193.

Did you announce your route 213.215.28.0/23 to Completel AS12670 ?

Best Regards,

3

Hi,

I'm of course announcing it to their upstream router.

If their upstream router actually forwards it to its neighbors is another question...which I can't unfortunately not answer. But I guess the announce is not propagated outside of their network...

Thanks for your help.

Laurent

4

This might explain it ..

suresh@frodo 19:59:40 :~$ whois -h whois.radb.net 213.215.28.0
route: 213.215.0.0/18
descr: NERIM-213-215
origin: AS13193
holes: 213.215.38.0/24
mnt-by: NERIM-MNT
changed: bouaziz@nerim.net 20020827
changed: bouaziz@nerim.net 20081107
source: RIPE

You need to update radb with your other prefix. See
http://www.radb.net/rfc2622.html

5

Hi,

It seems the netblock 213.215.28.0/23 is now reachable through AS13193
and AS12670.

Thanks

Laurent

6

Yup. Compare this current radb lookup -

suresh@frodo 09:53:21 :~$ whois -h whois.radb.net 213.215.28.0/23
route: 213.215.28.0/23
descr: LNC-1
origin: AS49463
mnt-by: NERIM-MNT
changed: bouaziz@nerim.net 20090907
source: RIPE

with the previous one -

suresh@frodo 19:59:40 :~$ whois -h whois.radb.net 213.215.28.0
route: 213.215.0.0/18
descr: NERIM-213-215
origin: AS13193
holes: 213.215.38.0/24
mnt-by: NERIM-MNT
changed: bouaziz@nerim.net 20020827
changed: bouaziz@nerim.net 20081107
source: RIPE

7

A hole in 213.215.0.0/18 was missing and has been added by the 1st ISP.