Hi Vinny! As i am thinking about this, i came to the idea that mostly uu.net applies filters to their downstreams e.g. there are not filtering by as - they filter by access-list what i presume is that they use a access-list xyz permit 151.189.0.0 255.255.255.0 instead of (the correct one): access-list xyz permit 151.189.0.0 255.255.0.0 note the difference ? It's probably time for them to call the uunet support to fix this. Winfried Haug wrote:
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 :-) ?
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