not particularly when you take a look at it. Misbehaved origin AS: BGP routing table entry for 63.237.115.192/27, version 3368964 Paths: (3 available, best #3) Not advertised to any peer 5056 3561 3908 167.142.3.6 from 167.142.3.6 (167.142.3.6) Origin IGP, localpref 100, valid, external 1221 3561 3908 203.62.248.4 from 203.62.248.4 (203.62.248.4) Origin IGP, localpref 100, valid, external 1221 3561 3908 203.62.252.21 from 203.62.252.21 (203.62.252.21) Origin IGP, localpref 100, valid, external, best route-views.oregon-ix.net> A router will take the most specific path that it knows about to a particular destination. Since parts of the Internet are seeing a /27 here, it's winding up going all over the place. It would appear that AS3561 is allowing such small advertisements from AS3908, and then providers that dont have filtering at the border based on prefix length get injected this very specific route. Yet more examples of what happens with a lack of filtering........ On Mon, 22 Jan 2001, Joe Budion wrote:
This one takes the cake for weirdest route I've ever seen:
#3 sl-gw5-kc-5-0-0.sprintlink.net (144.232.132.45): TTL Exceeded, ttl=253, 41 ms #4 sl-bb20-kc-0-0.sprintlink.net (144.232.23.1): TTL Exceeded, ttl=252, 40 ms #5 sl-bb20-fw-13-0.sprintlink.net (144.232.9.254): TTL Exceeded, ttl=251, 50 ms #6 Unavailable (144.232.18.162): TTL Exceeded, ttl=250, 50 ms #7 dal-core-02.inet.qwest.net (205.171.25.49): TTL Exceeded, ttl=249, 50 ms #8 hou-core-01.inet.qwest.net (205.171.5.169): TTL Exceeded, ttl=248, 50 ms #9 hou-edge-07.inet.qwest.net (205.171.23.14): TTL Exceeded, ttl=247, 50 ms #10 a6-0-6.crtntx1-ba2.bbnplanet.net (4.24.147.21): TTL Exceeded, ttl=241, 80 ms #11 p10-0.crtntx1-br2.bbnplanet.net (4.24.10.189): TTL Exceeded, ttl=242, 81 ms #12 p2-0.crtntx1-cr8.bbnplanet.net (4.24.8.198): TTL Exceeded, ttl=241, 80 ms #13 p5-0.toucham.bbnplanet.net (4.24.117.66): TTL Exceeded, ttl=240, 100 ms #14 den-edge-18.inet.qwest.net (205.171.16.34): TTL Exceeded, ttl=239, 101 ms #15 Unavailable (63.145.64.62): TTL Exceeded, ttl=238, 150 ms #16 SLCNTWEB01 (63.237.115.200): Echo Reply, ttl=110, 150 ms
Statistics: Out 14, in 14, loss 0%, times (min/avg/max) 40/76/150 ms
joe