Hello..
one of our customers (germany.net, AS6751) is announcing us
151.189.0.0/16. We announce this to our both upstreams
ECRC (AS1273) and Ebone (1755).
Since a few days a lot of german ISPs ask us, why 151.189.0.0/24
is routed via UU.net to the USA and then goes back to germany.
We checked our cisco-routers an finaly i found a Customer of UU.net
with a looking glass: (http://zeus.lyceum.com/cgi-bin/nph-bgp-routes)
QUERY: bgp 151.189.0.0
FROM: BR1.ATL1.lyceum.net.BGP routing table entry for 151.189.0.0/24, version 9891827
Paths: (1 available, best #1, advertised over IBGP)
701 1800 1755 1755 1755 5549 5549 6751
157.130.64.121 from 157.130.64.121 (137.39.2.42)
Origin IGP, valid, external, best
ok lets see bacK:
Sprint (1800) doesnt have this /24 but the /16 as it should be:
icm-bb4-pen#show ip bgp 151.189.0.0 255.255.255.0
% Network not in table
icm-bb4-pen#
the same applies to EBONE (AS1755):
frankfurt-ebs1>show ip bgp 151.189.0.0 255.255.255.0
% Network not in table
frankfurt-ebs1>
an we (AS5549) also dont see any /24 out of 151.189.0.0/16
So the question is: why does UU.net announce 151.189.0.0/24 and from
where do they get it. The worse thing is, that all uu.net customers get
this )(&%&$()& /24 from the hub in Frankfurt. The Space
151.189.1.0 - 151.189.255.255 is visiable at uu.net via 151.189.0.0/16..
So what happens here, could this be an ios bug ?
We didnt touch our configuration towards ebone and they dont play
with their configuration every day 
Any ideas ? hints ?
Winfried
PS: for the german isps, we fixed it by announcing only at de-cix the
151.189.0.0/24 additionally to 151.189.0.0/16 and it works, but
i am still looking for an answer to my questions ?