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Re: routing problem to ftp.iglu.org.il



Hello,
  The problem happened because I tried to balance our AT&T link
(we have links through various providers) by sending more-specific
routes, without sending them to the IIX too, thus forcing all the
traffic for these routes to go through AT&T.

  Sorry for the trouble caused.  Today morning I intend to implement
that balancing scheme correctly.

                                Amir

> ---------- Forwarded message ----------
> Date: Sun, 25 Nov 2001 16:31:01 +0200 (IST)
>From: Ariel Biener <ariel@fireball.tau.ac.il>

> 
>   Hi,
> 
> 
> 
> 
>    It seems that the net for that server is being advertised in a such way
> that all access to it from outside AT&T or actcom is going via abroad:
> 
> Look:
> 
> Israel-IX#sh ip bgp 192.117.122.34
> BGP routing table entry for 192.117.96.0/19, version 112897
> Paths: (4 available, best #4)
> ...
> 
>   8584 4148, (received-only)
>     192.114.63.86 from 192.114.63.86 (206.49.94.71)
>       Origin IGP, localpref 100, valid, external
>   8584 4148, (received-only)
>     192.114.63.142 from 192.114.63.142 (212.150.64.4)
>       Origin IGP, localpref 100, valid, external
>   9116 4148 4148 4148, (received-only)
>     192.114.63.146 from 192.114.63.146 (212.199.26.254)
>       Origin IGP, localpref 100, valid, external
>   4148 4148 13278 13278, (received & used)
>     192.114.63.74 from 192.114.63.74 (212.199.63.50)
>       Origin IGP, metric 0, localpref 100, valid, external, best
> 
> Notice that the only accepted route is via actcom, and note that they
> advertise 192.117.96.0/19.
> 
> Now, from abroad, there are 25 routes, see below the whole list for
> explanation:
> 
> 
> BGP routing table entry for 192.117.120.0/21, version 2213269
> Paths: (25 available, best #2)
>   Not advertised to any peer
>   5511 8584 8584 8584 13264 13264 13264 1833 1833 1299 2686 3339 4148 4148
> 4148 4148
>     209.1.220.102 from 209.1.220.102 (209.1.220.102)
>       Origin incomplete, localpref 1000, valid, internal
>   5511 8584 8584 8584 13264 13264 13264 1833 1833 1299 2686 3339 4148 4148
> 4148 4148
>     209.1.40.51 from 209.1.40.51 (209.1.40.51)
>       Origin incomplete, localpref 1000, valid, internal, best
>   5511 8584 8584 8584 13264 13264 13264 1833 1833 1299 2686 3339 4148 4148
> 4148 4148
>     209.1.40.51 from 209.1.220.224 (209.1.40.51)
>       Origin incomplete, localpref 1000, valid, internal
>       Originator: 209.1.40.51, Cluster list: 0.0.16.125
>   5511 8584 8584 8584 13264 13264 13264 1833 1833 1299 2686 3339 4148 4148
> 4148 4148
>     209.1.220.102 from 209.1.220.89 (209.1.220.102)
>       Origin incomplete, localpref 1000, valid, internal
>       Originator: 209.1.220.102, Cluster list: 0.0.4.186
>   5511 8584 8584 8584 13264 13264 13264 1833 1833 1299 2686 3339 4148 4148
> 4148 4148
>     209.1.220.102 from 209.1.220.166 (209.1.220.102)
>       Origin incomplete, localpref 1000, valid, internal
>       Originator: 209.1.220.102, Cluster list: 0.0.4.216
>   3561 5511 8584 8584 8584 13264 13264 13264 1833 1833 1299 2686 3339 4148
> 4148 4148 4148
>     209.1.40.72 from 209.1.40.72 (209.1.40.72)
>       Origin incomplete, localpref 1000, valid, internal
>   701 5511 8584 8584 8584 13264 13264 13264 1833 1833 1299 2686 3339 4148
> 4148 4148 4148
>     209.1.220.174 from 209.1.220.174 (209.1.220.174)
>       Origin incomplete, localpref 1000, valid, internal
>   701 5511 8584 8584 8584 13264 13264 13264 1833 1833 1299 2686 3339 4148
> 4148 4148 4148
>     209.1.220.203 from 209.1.220.203 (209.1.220.203)
>       Origin incomplete, localpref 1000, valid, internal
>   3561 5511 8584 8584 8584 13264 13264 13264 1833 1833 1299 2686 3339 4148
> 4148 4148 4148
>     209.1.220.126 from 209.1.220.126 (209.1.220.126)
>       Origin incomplete, localpref 1000, valid, internal
>   3561 5511 8584 8584 8584 13264 13264 13264 1833 1833 1299 2686 3339 4148
> 4148 4148 4148
>     209.1.220.156 from 209.1.220.156 (209.1.220.156)
>       Origin incomplete, localpref 1000, valid, internal
>   3561 5511 8584 8584 8584 13264 13264 13264 1833 1833 1299 2686 3339 4148
> 4148 4148 4148
>     209.1.220.139 from 209.1.220.139 (209.1.220.139)
>       Origin incomplete, localpref 1000, valid, internal
>   3561 5511 8584 8584 8584 13264 13264 13264 1833 1833 1299 2686 3339 4148
> 4148 4148 4148
>     209.1.220.133 from 209.1.220.133 (209.1.220.133)
>       Origin incomplete, localpref 1000, valid, internal
>   3561 5511 8584 8584 8584 13264 13264 13264 1833 1833 1299 2686 3339 4148
> 4148 4148 4148
>     209.1.40.141 from 209.1.40.141 (209.1.40.141)
>       Origin incomplete, localpref 1000, valid, internal
>   3561 5511 8584 8584 8584 13264 13264 13264 1833 1833 1299 2686 3339 4148
> 4148 4148 4148
>     209.1.220.40 from 209.1.220.40 (209.1.220.40)
>       Origin incomplete, localpref 1000, valid, internal
>   3561 5511 8584 8584 8584 13264 13264 13264 1833 1833 1299 2686 3339 4148
> 4148 4148 4148
>     209.1.220.66 from 209.1.220.66 (209.1.220.66)
>       Origin incomplete, localpref 1000, valid, internal
>   3561 5511 8584 8584 8584 13264 13264 13264 1833 1833 1299 2686 3339 4148
> 4148 4148 4148
>     209.1.220.242 from 209.1.220.242 (209.1.220.242)
>       Origin incomplete, localpref 1000, valid, internal
>   701 5511 8584 8584 8584 13264 13264 13264 1833 1833 1299 2686 3339 4148
> 4148 4148 4148
>     209.1.40.129 from 209.1.40.129 (209.1.40.129)
>       Origin incomplete, localpref 1000, valid, internal
>   701 5511 8584 8584 8584 13264 13264 13264 1833 1833 1299 2686 3339 4148
> 4148 4148 4148
>     209.1.220.95 from 209.1.220.95 (209.1.220.95)
>       Origin incomplete, localpref 1000, valid, internal
>   701 5511 8584 8584 8584 13264 13264 13264 1833 1833 1299 2686 3339 4148
> 4148 4148 4148
>     209.1.40.233 from 209.1.40.233 (209.1.40.233)
>       Origin incomplete, localpref 1000, valid, internal
>   701 5511 8584 8584 8584 13264 13264 13264 1833 1833 1299 2686 3339 4148
> 4148 4148 4148
>     209.1.220.116 from 209.1.220.116 (209.1.220.116)
>       Origin incomplete, localpref 1000, valid, internal
>   701 5511 8584 8584 8584 13264 13264 13264 1833 1833 1299 2686 3339 4148
> 4148 4148 4148
>     209.1.40.52 from 209.1.40.52 (209.1.40.52)
>       Origin incomplete, localpref 1000, valid, internal
>   701 5511 8584 8584 8584 13264 13264 13264 1833 1833 1299 2686 3339 4148
> 4148 4148 4148
>     209.1.40.63 from 209.1.40.63 (209.1.40.63)
>       Origin incomplete, localpref 1000, valid, internal
>   701 5511 8584 8584 8584 13264 13264 13264 1833 1833 1299 2686 3339 4148
> 4148 4148 4148
>     209.1.220.194 from 209.1.220.194 (209.1.220.194)
>       Origin incomplete, localpref 1000, valid, internal
>   701 5511 8584 8584 8584 13264 13264 13264 1833 1833 1299 2686 3339 4148
> 4148 4148 4148
>     209.1.220.107 from 209.1.220.107 (209.1.220.107)
>       Origin incomplete, localpref 1000, valid, internal
>   701 5511 8584 8584 8584 13264 13264 13264 1833 1833 1299 2686 3339 4148
> 4148 4148 4148
>     209.1.40.201 from 209.1.40.201 (209.1.40.201)
>       Origin incomplete, localpref 1000, valid, internal
> 
> 
> As you can see, a more specific route, aka, 192.117.120.0/21 is being
> advertised to the world. Since this is the case, all Israeli ISPs will
> chose their international links in order to reach ftp.iglu.org.il (or
> whatever is on 192.117.12[0-7].[0-255] (that is 192.117.120.0/21).
> 
> This needs to be fixed by actcom. Notice that the route abroad also ends
> at "3339 4148", which means "AT&T Actcom". A typical tracroute to
> ftp.iglu.org.il from Machba looks like:
> 
> traceroute to ftp.iglu.org.il (192.117.122.34), 30 hops max, 38 byte
> packets
>  1  c6509-16 (132.66.17.254)  0.754 ms  0.195 ms  0.196 ms
>  2  * * *
>  3  tel-aviv (132.66.4.1)  1.251 ms  1.214 ms  1.329 ms
>  4  gp1-tau-mag.ilan.net.il (128.139.203.22)  182.786 ms  428.374 ms
> 209.165 ms
>  5  gp0-gp1-mag.ilan.net.il (128.139.203.2)  5.291 ms  5.244 ms  5.445 ms
>  6  iucc.uk1.uk.geant.net (62.40.103.165)  82.088 ms  81.640 ms  101.985
> ms
>  7  infonet-gw.uk1.uk.geant.net (62.40.103.154)  83.478 ms  104.166 ms
> 106.163 ms
>  8  london2.gb.eqip.net (195.90.64.26)  87.079 ms  83.050 ms  83.517 ms
>  9  linx1nap-1-3.lo.uk.attglobal.net (152.158.20.153)  85.725 ms  103.142
> ms  106.300 ms
> 10  lond1br2.lo.uk.prserv.net (152.158.20.2)  154.515 ms  239.567 ms
> 232.633 ms
> 11  152.158.76.66 (152.158.76.66)  168.594 ms  179.948 ms  173.235 ms
> 12  b2-tavi1br2.tlv.att.net.il (192.116.177.229)  167.451 ms  149.785 ms
> 179.351 ms
> 13  * * *
> 
> 
> --Ariel
> 
> --
> Ariel Biener
> e-mail: ariel@post.tau.ac.il
> PGP(6.5.8) public key http://www.tau.ac.il/~ariel/pgp.html
> 
> 
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> 
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