{"action":"created","issue":{"url":"https://api.github.com/repos/Igalia/snabb/issues/504","repository_url":"https://api.github.com/repos/Igalia/snabb","labels_url":"https://api.github.com/repos/Igalia/snabb/issues/504/labels{/name}","comments_url":"https://api.github.com/repos/Igalia/snabb/issues/504/comments","events_url":"https://api.github.com/repos/Igalia/snabb/issues/504/events","html_url":"https://github.com/Igalia/snabb/issues/504","id":184238497,"number":504,"title":"lwaftr :  configuration with vlan ignores mtu  setting","user":{"login":"blourdel","id":22958735,"avatar_url":"https://avatars.githubusercontent.com/u/22958735?v=3","gravatar_id":"","url":"https://api.github.com/users/blourdel","html_url":"https://github.com/blourdel","followers_url":"https://api.github.com/users/blourdel/followers","following_url":"https://api.github.com/users/blourdel/following{/other_user}","gists_url":"https://api.github.com/users/blourdel/gists{/gist_id}","starred_url":"https://api.github.com/users/blourdel/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/blourdel/subscriptions","organizations_url":"https://api.github.com/users/blourdel/orgs","repos_url":"https://api.github.com/users/blourdel/repos","events_url":"https://api.github.com/users/blourdel/events{/privacy}","received_events_url":"https://api.github.com/users/blourdel/received_events","type":"User","site_admin":false},"labels":[],"state":"closed","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":5,"created_at":"2016-10-20T14:02:46Z","updated_at":"2016-10-21T08:30:13Z","closed_at":"2016-10-21T08:30:12Z","body":"In a lwaftr  setup with vlan configured for ipv4 and ipv6 traffic, 1519B packets are dropped while smaller packets are processed (1518B works) regardless of the mtu setting. The behavior is the same with same or different vlan-id for ipv4 and ipv6.\r\n\r\nI am running snabb lwaftr version v1.1.11\r\n\r\n**How to reproduce**\r\n\r\nWhile configuring vlan for both ipv6 and ipv4, send 1519Byte ipv4 or ipv4/ipv6 encapsulated packet to the lwaftr. They are all dropped. If packet size is reduced, all packets are going through the lwaftr. The configuration has both ipv4 and ipv6 mtu set to 9500B.\r\n\r\n**Topology**\r\nIXIA packet generator -----router------snabb\r\n\r\n**Configuration**\r\n\r\nhairpinning = false,\r\nbinding_table = binding_table.txt.s,\r\naftr_ipv6_ip = 2001:db8::1,\r\naftr_ipv4_ip = 1.1.0.20,\r\naftr_mac_inet_side = 02:3d:dc:07:0b:00,\r\ninet_mac = 44:f4:77:bc:c5:cf,\r\naftr_mac_b4_side = 02:3d:dc:07:0b:00,\r\nnext_hop6_mac = 44:f4:77:bc:c5:cf,\r\nipv4_mtu = 9500,\r\nipv6_mtu = 9500,\r\nvlan_tagging = true,\r\nv4_vlan_tag = 100,\r\nv6_vlan_tag = 100,\r\npolicy_icmpv4_incoming = allow,\r\npolicy_icmpv4_outgoing = drop,\r\npolicy_icmpv6_incoming = allow,\r\npolicy_icmpv6_outgoing = drop,\r\n\r\n**Packet capture**\r\n\r\n**Binding table**\r\n[zipped_binding_table.txt.s.gz](https://github.com/Igalia/snabb/files/541751/zipped_binding_table.txt.s.gz)\r\n"},"comment":{"url":"https://api.github.com/repos/Igalia/snabb/issues/comments/255324426","html_url":"https://github.com/Igalia/snabb/issues/504#issuecomment-255324426","issue_url":"https://api.github.com/repos/Igalia/snabb/issues/504","id":255324426,"user":{"login":"blourdel","id":22958735,"avatar_url":"https://avatars.githubusercontent.com/u/22958735?v=3","gravatar_id":"","url":"https://api.github.com/users/blourdel","html_url":"https://github.com/blourdel","followers_url":"https://api.github.com/users/blourdel/followers","following_url":"https://api.github.com/users/blourdel/following{/other_user}","gists_url":"https://api.github.com/users/blourdel/gists{/gist_id}","starred_url":"https://api.github.com/users/blourdel/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/blourdel/subscriptions","organizations_url":"https://api.github.com/users/blourdel/orgs","repos_url":"https://api.github.com/users/blourdel/repos","events_url":"https://api.github.com/users/blourdel/events{/privacy}","received_events_url":"https://api.github.com/users/blourdel/received_events","type":"User","site_admin":false},"created_at":"2016-10-21T08:30:12Z","updated_at":"2016-10-21T08:30:12Z","body":"I close this problem report. A switch in between snabb and the packet generator had a \"by-default\" mtu set, dropping packet over 1518. I confirm that vlan configuration are supporting large packet sizes.\r\n"}}
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