2) networks having an existing AS-number in database but reflected differently in the routing tables (the can sometimes be a config error).
128.86.0.0 in AS786 (database) and AS1755 (BGP)
This is due to the fact that 128.86.0.0 is used as the London DMZ, and even if the EBS receives if with AS786 from the Janet RBS, it will prefer the cheapest route, locally connected to the EBS when announced to the outside world. -Peter
Peter Lothberg <roll@bsd.stupi.se> writes:
2) networks having an existing AS-number in database but reflected differ ently in the routing tables (the can sometimes be a config error).
128.86.0.0 in AS786 (database) and AS1755 (BGP)
This is due to the fact that 128.86.0.0 is used as the London DMZ, and even if the EBS receives if with AS786 from the Janet RBS, it will prefer the cheapest route, locally connected to the EBS when announced to the outside world.
From ripe-81:
... o An IP network number can and must only belong to one AS. This is a direct consequence of the fact that at each point in the Internet there can be exactly one routing policy for traffic destined to each network. In the case of the IP network which is used in neighbor peering between two ASes, say at the border between two ASes, a conscious decision must be made as to which AS this IP network number actually resides in. ... So either the JANET RBS or the EBS should stop injecting this net into EBONE. Any problems with that? Daniel
Daniel Karrenberg <Daniel.Karrenberg@ripe.net> writes: * * > Peter Lothberg <roll@bsd.stupi.se> writes: * > > 2) networks having an existing AS-number in database but reflected di * ffer * > ently * > > in the routing tables (the can sometimes be a config error). * > > * > > 128.86.0.0 in AS786 (database) and AS1755 (BGP) * > * > This is due to the fact that 128.86.0.0 is used as the London DMZ, and * > even if the EBS receives if with AS786 from the Janet RBS, it will * > prefer the cheapest route, locally connected to the EBS when announced * > to the outside world. * * >From ripe-81: * * ... * o An IP network number can and must only belong to one * AS. This is a direct consequence of the fact that at * each point in the Internet there can be exactly one * routing policy for traffic destined to each network. In * the case of the IP network which is used in neighbor * peering between two ASes, say at the border between two * ASes, a conscious decision must be made as to which AS * this IP network number actually resides in. * ... * * So either the JANET RBS or the EBS should stop injecting this * net into EBONE. Any problems with that? * * Daniel Yep and in this case the RBS should advertise it. Remember this is part of a transition I started for the DMZs. However, it does highlight that people at RBSs should also watch the network statements in their configurations. --Tony.
participants (3)
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Daniel Karrenberg -
Peter Lothberg -
Tony Bates