From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Ahern Subject: Re: Bug and configuration MPLS error? Date: Tue, 25 Apr 2017 20:22:56 -0600 Message-ID: References: <184081493141314@web16g.yandex.ru> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit To: =?UTF-8?B?0JDQu9C10LrRgdC10Lkg0JHQvtC70LTRi9GA0LXQsg==?= , netdev Return-path: Received: from mail-pf0-f175.google.com ([209.85.192.175]:36176 "EHLO mail-pf0-f175.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1952613AbdDZCXA (ORCPT ); Tue, 25 Apr 2017 22:23:00 -0400 Received: by mail-pf0-f175.google.com with SMTP id 194so34709484pfv.3 for ; Tue, 25 Apr 2017 19:23:00 -0700 (PDT) In-Reply-To: <184081493141314@web16g.yandex.ru> Sender: netdev-owner@vger.kernel.org List-ID: On 4/25/17 11:28 AM, Алексей Болдырев wrote: > 226 sysctl -w net.mpls.conf.lo.input=1 > 227 sysctl -w net.mpls.platform_labels=1048575 > 228 ip link add veth0 type veth peer name veth1 > 229 ip link add veth2 type veth peer name veth3 > 230 sysctl -w net.mpls.conf.veth0.input=1 > 231 sysctl -w net.mpls.conf.veth2.input=1 > 232 ifconfig veth0 10.3.3.1 netmask 255.255.255.0 > 233 ifconfig veth2 10.4.4.1 netmask 255.255.255.0 > 234 ip netns add host1 > 235 ip netns add host2 > 236 ip link set veth1 netns host1 > 237 ip link set veth3 netns host2 > 238 ip netns exec host1 ifconfig veth1 10.3.3.2 netmask 255.255.255.0 up > 239 ip netns exec host2 ifconfig veth3 10.4.4.2 netmask 255.255.255.0 up > 240 ip netns exec host1 ip route add 10.10.10.2/32 encap mpls 112 via inet 10.3.3.1 > 241 ip netns exec host2 ip route add 10.10.10.1/32 encap mpls 111 via inet 10.4.4.1 > 242 ip -f mpls route add 111 via inet 10.3.3.2 > 243 ip -f mpls route add 112 via inet 10.4.4.2 your setup is incomplete. # ip netns exec host2 ping 10.10.10.1 PING 10.10.10.1 (10.10.10.1) 56(84) bytes of data. ^C --- 10.10.10.1 ping statistics --- 2 packets transmitted, 0 received, 100% packet loss, time 1038ms If you run tcpdump on veth1 in host1 you see the packets come in but no response: # ip netns exec host1 tcpdump -n -i veth1 tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on veth1, link-type EN10MB (Ethernet), capture size 262144 bytes 19:20:24.599529 IP6 fe80::347d:e3ff:fe93:944b > ff02::2: ICMP6, router solicitation, length 16 19:20:27.413901 IP 10.4.4.2 > 10.10.10.1: ICMP echo request, id 978, seq 1, length 64 19:20:28.439574 IP 10.4.4.2 > 10.10.10.1: ICMP echo request, id 978, seq 2, length 64 and the lack of response is b/c: 1. host1 has no address for 10.10.10.1 and 2. even if it did, there is no return route to 10.4.4.2: # ip -netns host1 ro ls 10.3.3.0/24 dev veth1 proto kernel scope link src 10.3.3.2 10.10.10.2 encap mpls 112 via 10.3.3.1 dev veth1