Cannot tunnel two namespace Routers

asked 2014-09-05 02:47:43 -0500

Germy Lure gravatar image

updated 2014-09-05 17:35:39 -0500

smaffulli gravatar image

Network TOPO like this: VM1(net1)--Router1-------IPSec VPN tunnel-------Router2--VM2(net2)

If left and right side deploy on different OpenStack environments, it works well. But in the same environment, Router1 and Router2 are namespace implement in the same network node. I cannot ping from VM1 to VM2.

In R2(Router2), tcpdump tool tells us that R2 receives ICMP echo request packets but doesnt send them out.

7837C113-D21D-B211-9630-000000821800:~ # ip netns exec qrouter-4fd2e76e-37d0-4d05-b5a1-dd987c0231ef tcpdump -i any
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on any, link-type LINUX_SLL (Linux cooked), capture size 65535 bytes
11:50:14.853470 IP 10.10.5.2 > 10.10.5.3: ESP(spi=0xc6d65c02,seq=0x1e6), length 132
11:50:14.853470 IP 128.6.25.2 > 128.6.26.2: ICMP echo request, id 44567, seq 486, length 64
11:50:15.853475 IP 10.10.5.2 > 10.10.5.3: ESP(spi=0xc6d65c02,seq=0x1e7), length 132
11:50:15.853475 IP 128.6.25.2 > 128.6.26.2: ICMP echo request, id 44567, seq 487, length 64
11:50:16.853461 IP 10.10.5.2 > 10.10.5.3: ESP(spi=0xc6d65c02,seq=0x1e8), length 132
11:50:16.853461 IP 128.6.25.2 > 128.6.26.2: ICMP echo request, id 44567, seq 488, length 64
11:50:17.853447 IP 10.10.5.2 > 10.10.5.3: ESP(spi=0xc6d65c02,seq=0x1e9), length 132
11:50:17.853447 IP 128.6.25.2 > 128.6.26.2: ICMP echo request, id 44567, seq 489, length 64
^C
8 packets captured
8 packets received by filter
0 packets dropped by kernel

ip addr in R2:

7837C113-D21D-B211-9630-000000821800:~ # ip netns exec qrouter-4fd2e76e-37d0-4d05-b5a1-dd987c0231ef ip addr
187: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN group default
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
206: qr-4bacb61c-72: <BROADCAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN group default
    link/ether fa:16:3e:23:10:97 brd ff:ff:ff:ff:ff:ff
    inet 128.6.26.1/24 brd 128.6.26.255 scope global qr-4bacb61c-72
    inet6 fe80::f816:3eff:fe23:1097/64 scope link
       valid_lft forever preferred_lft forever
208: qg-4abd4bb0-21: <BROADCAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN group default
    link/ether fa:16:3e:e6:cd:1a brd ff:ff:ff:ff:ff:ff
    inet 10.10.5.3/24 brd 10.10.5.255 scope global qg-4abd4bb0-21
    inet6 fe80::f816:3eff:fee6:cd1a/64 scope link
       valid_lft forever preferred_lft forever

In addition, the kernel counter "/proc/net/snmp" in namespace is unchanged. These routers do not work well with namespace?

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