North American Network Operators Group|
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Re: Class B address routing
On Thu, 18 May 2000, Kenji Anzai wrote: > I'm having problem with our class B address. Last month, we tested our > class B address. We announce the address as 2 x /17 from 2 different > POP under the same ISP's data center. However, some ISP do NOT accept > our route since the address belongs to traditional Class B address, and > they told me that they only accept if we announce it as /16. (They > filtered out our route$B!D(B..) > > I talked to some people, they suggested me that we need to announce the > block as /16 from both POP, even though we only like to announce /17 > from each POP (Front /17 from one POP, the other /17 from another POP.). > > How could we do so ? Please help us. At both POPs, announce the /16 normally. Then also announce the specific /17 as a non-export route. The effect will be that the /16 will be announced to the world so those ISPs that filter will listen to the announcement. Your upstream ISP will have both /17's so they will direct the traffic within their network to the appropriate POP. An added benefit of this configuration will be that if one of your POPs goes down, the traffic will automatically re-route to the other POP. Brandon Ross 404-522-5400 VP Engineering, NetRail http://www.netrail.net AIM: BrandonNR ICQ: 2269442 Read RFC 2644! Stop Smurf attacks! Configure your router interfaces to block directed broadcasts. See http://www.quadrunner.com/~chuegen/smurf.cgi for details.