{"action":"created","issue":{"url":"https://api.github.com/repos/RIOT-OS/RIOT/issues/4456","repository_url":"https://api.github.com/repos/RIOT-OS/RIOT","labels_url":"https://api.github.com/repos/RIOT-OS/RIOT/issues/4456/labels{/name}","comments_url":"https://api.github.com/repos/RIOT-OS/RIOT/issues/4456/comments","events_url":"https://api.github.com/repos/RIOT-OS/RIOT/issues/4456/events","html_url":"https://github.com/RIOT-OS/RIOT/pull/4456","id":121272237,"number":4456,"title":"sys: net: gnrc: ndp: consider all interfaces for on-link targets","user":{"login":"kaspar030","id":4679640,"avatar_url":"https://avatars.githubusercontent.com/u/4679640?v=3","gravatar_id":"","url":"https://api.github.com/users/kaspar030","html_url":"https://github.com/kaspar030","followers_url":"https://api.github.com/users/kaspar030/followers","following_url":"https://api.github.com/users/kaspar030/following{/other_user}","gists_url":"https://api.github.com/users/kaspar030/gists{/gist_id}","starred_url":"https://api.github.com/users/kaspar030/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/kaspar030/subscriptions","organizations_url":"https://api.github.com/users/kaspar030/orgs","repos_url":"https://api.github.com/users/kaspar030/repos","events_url":"https://api.github.com/users/kaspar030/events{/privacy}","received_events_url":"https://api.github.com/users/kaspar030/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/RIOT-OS/RIOT/labels/bug","name":"bug","color":"fc2929"},{"url":"https://api.github.com/repos/RIOT-OS/RIOT/labels/network","name":"network","color":"bfdadc"},{"url":"https://api.github.com/repos/RIOT-OS/RIOT/labels/Request%20for%20Comments","name":"Request for Comments","color":"23F823"}],"state":"open","locked":false,"assignee":{"login":"authmillenon","id":675644,"avatar_url":"https://avatars.githubusercontent.com/u/675644?v=3","gravatar_id":"","url":"https://api.github.com/users/authmillenon","html_url":"https://github.com/authmillenon","followers_url":"https://api.github.com/users/authmillenon/followers","following_url":"https://api.github.com/users/authmillenon/following{/other_user}","gists_url":"https://api.github.com/users/authmillenon/gists{/gist_id}","starred_url":"https://api.github.com/users/authmillenon/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/authmillenon/subscriptions","organizations_url":"https://api.github.com/users/authmillenon/orgs","repos_url":"https://api.github.com/users/authmillenon/repos","events_url":"https://api.github.com/users/authmillenon/events{/privacy}","received_events_url":"https://api.github.com/users/authmillenon/received_events","type":"User","site_admin":false},"milestone":null,"comments":35,"created_at":"2015-12-09T15:35:29Z","updated_at":"2016-02-04T12:32:51Z","closed_at":null,"pull_request":{"url":"https://api.github.com/repos/RIOT-OS/RIOT/pulls/4456","html_url":"https://github.com/RIOT-OS/RIOT/pull/4456","diff_url":"https://github.com/RIOT-OS/RIOT/pull/4456.diff","patch_url":"https://github.com/RIOT-OS/RIOT/pull/4456.patch"},"body":"I stumbled over this in the following setup:\r\n\r\n```\r\nLinux (beef::2/64) <-> (beef::1) 6lr (dead::1) <->(dead::blah)\r\n```\r\n\r\n**edit** I'm using ethernet (ethos) between linux and 6lr and both RIOT's are samr21 xpro.\r\n\r\nWithout this patch, when trying to ping dead::1 from Linux host, RIOT tries to only consider prefixes from it's sixlowpan interface, so communication doesn't work.\r\n\r\nWith this patch, RIOT considers all configured prefixes for the best match.\r\n"},"comment":{"url":"https://api.github.com/repos/RIOT-OS/RIOT/issues/comments/179804199","html_url":"https://github.com/RIOT-OS/RIOT/pull/4456#issuecomment-179804199","issue_url":"https://api.github.com/repos/RIOT-OS/RIOT/issues/4456","id":179804199,"user":{"login":"OlegHahm","id":1590423,"avatar_url":"https://avatars.githubusercontent.com/u/1590423?v=3","gravatar_id":"","url":"https://api.github.com/users/OlegHahm","html_url":"https://github.com/OlegHahm","followers_url":"https://api.github.com/users/OlegHahm/followers","following_url":"https://api.github.com/users/OlegHahm/following{/other_user}","gists_url":"https://api.github.com/users/OlegHahm/gists{/gist_id}","starred_url":"https://api.github.com/users/OlegHahm/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/OlegHahm/subscriptions","organizations_url":"https://api.github.com/users/OlegHahm/orgs","repos_url":"https://api.github.com/users/OlegHahm/repos","events_url":"https://api.github.com/users/OlegHahm/events{/privacy}","received_events_url":"https://api.github.com/users/OlegHahm/received_events","type":"User","site_admin":false},"created_at":"2016-02-04T12:32:51Z","updated_at":"2016-02-04T12:32:51Z","body":"I can't follow, you're too fast for an old man. Let's break it down:\r\n1. echo request comes in on interface 5\r\n2. gnrc decides it is for us\r\n3. re-queues the packet\r\n4. it arrives on interface 6\r\n5. icmp handles it\r\n6. tries to send the echo reply\r\n\r\n1. and 2. are okay.\r\nad 3. Why would it be re-queued?\r\nad 4. It arrives on another interface now? Why? Who sent it?"}}