Hi Igor, Thanks for your help and time!
> First question: does the router A see the response coming from > router B and then drop it or does the router B drop the packet? Router A sees the packets coming in (I see them when I run tcpdump). > Second question: why don't you configure router A to go through > router B as a prefered route to access the internet and use VlanY > as a fallback in case router B gets down? That is what I think is the nature of using BGP: you get asymmetric routes, where each router uses the shortest path to the internet, and the return traffic may come via any router. > Anayway, as far as I understand your problem, the packet would be > returned to router A on a different interface from where it was sent. That is correct. > So the interface of your router A will receive a packet from > router B but destination IP address is the one of VlanY which > is not matching the interface getting it and causes the DROP. Router A should just route the packet to the correct interface/socket. It does so for ping6... > You can probably setup an NDP proxy to solve this but it is an > ugly solution . NDP may be necessary when router B does not know where to send a package (which you can detect by seeing the Neighbour Sollicitation packets). But router B knows where to send the packages: router A and B share routes via OSPF, and I see the packages coming in on router A. The problem must be in router A... > All networking options (including NDP proxy, rpfilter etc.) can be > find here http://kernel.org/doc/Documentation/networking/ip-sysctl.txt Thanks for that link, it's more complete than other lists I have found. -- Best regards, Reinier Boon Reinier Boon | Senior software engineer | Telecats bv | KvK Enschede 06069106 | Tel: +31 53 488 99 26 | Fax: +31 53 488 99 10 | E mail: [email protected] -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: http://lists.debian.org/8a58bc555693b9439b45671ce7a324cb38fa3...@exchange2010.telecats.nl
