[afnog] problem with network

Wed Dec 9 11:42:38 UTC 2009

On Wednesday 09 December 2009 06:40:13 pm Brhunild wrote:

> 41.207.160.26

I have two circuits with PCCW, they both tell me the same
thing:

tinka at lab# run traceroute 41.207.160.26 
traceroute to 41.207.160.26 (41.207.160.26), 30 hops max, 40 byte packets
 1  ge9-12.br01.klp01.pccwbtn.net (63.218.167.101)  1.036 ms  0.754 ms  0.890 ms
 2  togotelecom.pos4-0.ar03.ldn01.pccwbtn.net (63.218.13.106)  315.027 ms  314.871 ms  314.951 ms
 3  * * *
 4  * * *
 5  41.207.160.26 (41.207.160.26)  319.252 ms  318.872 ms  318.740 ms

[edit]
tinka at lab#

lab2#traceroute 41.207.160.26

Type escape sequence to abort.
Tracing the route to 41.207.160.26

  1 ge9-3.br01.klp01.pccwbtn.net (63.218.167.113) [AS 3491] 0 msec 0 msec 4 msec
  2 togotelecom.pos4-0.ar03.ldn01.pccwbtn.net (63.218.13.106) [AS 3491] 312 msec 328 msec 316 msec
  3  *  *  * 
  4  *  *  * 
  5 41.207.160.26 [AS 24691] 316 msec 316 msec 316 msec
lab2#

The above is off the routers that have my PCCW connections. If
I do the traceroute from a server that uses the "best path", it
looks more like this:

[tinka at nms ~]$ traceroute -I 41.207.160.26
traceroute to 41.207.160.26 (41.207.160.26), 64 hops max, 72 byte packets
 1  ge-2-0-11.edge-gw-1-kul-pip.my.globaltransit.net (124.158.236.61)  0.371 ms  0.207 ms  0.146 ms
 2  ge-1-0-0-0.cr-gw-1-kul-pip.my.globaltransit.net (61.11.211.129)  0.663 ms  0.676 ms  0.670 ms
 3  ge-0-0-0-0.br-gw-1-kul-pip.my.globaltransit.net (61.11.210.254)  0.665 ms  0.628 ms  0.517 ms
 4  so-2-3-1.sin11.ip4.tinet.net (213.254.227.245)  7.067 ms  6.913 ms  6.909 ms
 5  sin1-tiscali-1.sin.seabone.net (213.144.176.81)  195.045 ms  194.743 ms  193.706 ms
 6  pal17-sin1-racc2.pal.seabone.net (195.22.218.194)  287.871 ms  286.319 ms  287.717 ms
 7  mil50-pal17-racc1.pal.seabone.net (195.22.218.121)  285.867 ms  284.957 ms  287.095 ms
 8  mil52-mil50-racc1.mil.seabone.net (195.22.196.133)  280.607 ms  279.926 ms  281.476 ms
 9  customer-side-togo-telecom-1-mil52.mil.seabone.net (195.22.208.122)  418.443 ms  417.057 ms  417.306 ms
10  41.207.178.99 (41.207.178.99)  416.862 ms  417.945 ms  419.705 ms
11  * * *
12  41.207.160.26 (41.207.160.26)  322.190 ms  322.303 ms  322.038 ms
[tinka at nms ~]$

Point is, it still gets there, and the same hop still
looks filtered (hop 11, as above).

Here's my view of the BGP routing table from the router chosen
to forward traffic to your network:

[edit]
tinka at lab# run show route 41.207.160.26                            

inet.0: 301467 destinations, 601094 routes (301467 active, 0 holddown, 0 hidden)
Restart Complete
+ = Active Route, - = Last Active, * = Both

41.207.160.0/23    *[BGP/170] 4d 22:36:59, MED 0, localpref 100
                      AS path: 3257 6762 24691 I
                    > to 213.254.227.245 via so-0/3/0.0
                    [BGP/170] 5d 10:53:19, localpref 90
                      AS path: 3491 24691 24691 24691 24691 I
                    > to 63.218.167.101 via ge-1/3/0.0

[edit]
tinka at lab#

You're prepending quite a bit to PCCW (although I also have a lower
LOCAL_PREF, but that's something else... ).

For the rest of my network, this is how I see your route:

lab3#sh bgp ipv4 unicast 41.207.160.26
BGP routing table entry for 41.207.160.0/23, version 9449565
Paths: (4 available, best #4, table default)
  Advertised to update-groups:
     7          8         
  7473 6762 24691
    61.11.209.61 (metric 1000) from 61.11.209.61 (61.11.209.61)
      Origin IGP, localpref 100, valid, internal
      Community: 24218:1
  2914 6762 24691
    61.11.209.62 (metric 1000) from 61.11.209.62 (61.11.209.62)
      Origin IGP, metric 0, localpref 100, valid, internal
      Community: 24218:1
  10026 3491 24691 24691 24691 24691, (Received from a RR-client)
    61.11.208.253 (metric 1000) from 61.11.208.253 (61.11.208.253)
      Origin IGP, metric 14197, localpref 100, valid, internal
      Community: 24218:1
  3257 6762 24691, (Received from a RR-client)
    61.11.208.254 (metric 1000) from 61.11.208.254 (61.11.208.254)
      Origin IGP, metric 0, localpref 100, valid, internal, best
      Community: 24218:1
lab3#

The above doesn't represent all possible paths from my network, 
just the best ones as calculated by each peering router.

Hope this helps.

Cheers,

Mark.
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