<div dir="ltr"><div><div>Hi Stackers,<br><br></div>Network TOPO like this: VM1(net1)--Router1-------IPSec VPN tunnel-------Router2--VM2(net2)<br></div><div>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.<br>
</div><div><br>In R2(Router2), tcpdump tool tells us that R2 receives ICMP echo request packets but doesnt send them out.<br><br><div style="margin-left:40px"><i><font size="1">7837C113-D21D-B211-9630-</font></i><i><font size="1">000000821800:~ # ip netns exec qrouter-4fd2e76e-37d0-4d05-</font></i><i><font size="1">b5a1-dd987c0231ef tcpdump -i any </font></i><br>
<i><font size="1">tcpdump: verbose output suppressed, use -v or -vv for full protocol decode</font></i><br><i><font size="1">listening on any, link-type LINUX_SLL (Linux cooked), capture size 65535 bytes</font></i><br><i><font size="1">
11:50:14.853470 IP 10.10.5.2 > <a href="http://10.10.5.3" target="_blank">10.10.5.3</a>: ESP(spi=0xc6d65c02,seq=0x1e6), length 132</font></i><br><i><font size="1">11:50:14.853470 IP 128.6.25.2 > <a href="http://128.6.26.2" target="_blank">128.6.26.2</a>: ICMP echo request, id 44567, seq 486, length 64</font></i><br>
<i><font size="1">
11:50:15.853475 IP 10.10.5.2 > <a href="http://10.10.5.3" target="_blank">10.10.5.3</a>: ESP(spi=0xc6d65c02,seq=0x1e7), length 132</font></i><br><i><font size="1">11:50:15.853475 IP 128.6.25.2 > <a href="http://128.6.26.2" target="_blank">128.6.26.2</a>: ICMP echo request, id 44567, seq 487, length 64</font></i><br>
<i><font size="1">
11:50:16.853461 IP 10.10.5.2 > <a href="http://10.10.5.3" target="_blank">10.10.5.3</a>: ESP(spi=0xc6d65c02,seq=0x1e8), length 132</font></i><br><i><font size="1">11:50:16.853461 IP 128.6.25.2 > <a href="http://128.6.26.2" target="_blank">128.6.26.2</a>: ICMP echo request, id 44567, seq 488, length 64</font></i><br>
<i><font size="1">
11:50:17.853447 IP 10.10.5.2 > <a href="http://10.10.5.3" target="_blank">10.10.5.3</a>: ESP(spi=0xc6d65c02,seq=0x1e9), length 132</font></i><br><i><font size="1">11:50:17.853447 IP 128.6.25.2 > <a href="http://128.6.26.2" target="_blank">128.6.26.2</a>: ICMP echo request, id 44567, seq 489, length 64</font></i><br>
<i><font size="1">
^C</font></i><br><i><font size="1">8 packets captured</font></i><br><i><font size="1">8 packets received by filter</font></i><br><i><font size="1">0 packets dropped by kernel</font></i><br></div><br></div><div>ip addr in R2:<br>
</div><br><div style="margin-left:40px"><font size="1">7837C113-D21D-B211-9630-</font><font size="1">000000821800:~ # ip netns exec qrouter-4fd2e76e-37d0-4d05-</font><font size="1">b5a1-dd987c0231ef ip addr<br>
187: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN group default <br> link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00<br> inet <a href="http://127.0.0.1/8" target="_blank">127.0.0.1/8</a> scope host lo<br>
inet6 ::1/128 scope host <br> valid_lft forever preferred_lft forever<br>206: qr-4bacb61c-72: <BROADCAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN group default <br> link/ether fa:16:3e:23:10:97 brd ff:ff:ff:ff:ff:ff<br>
inet <a href="http://128.6.26.1/24" target="_blank">128.6.26.1/24</a> brd 128.6.26.255 scope global qr-4bacb61c-72<br> inet6 fe80::f816:3eff:fe23:1097/64 scope link <br> valid_lft forever preferred_lft forever<br>
208: qg-4abd4bb0-21: <BROADCAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN group default <br>
link/ether fa:16:3e:e6:cd:1a brd ff:ff:ff:ff:ff:ff<br> inet <a href="http://10.10.5.3/24" target="_blank">10.10.5.3/24</a> brd 10.10.5.255 scope global qg-4abd4bb0-21<br> inet6 fe80::f816:3eff:fee6:cd1a/64 scope link <br>
valid_lft forever preferred_lft forever<br></font></div><br><br>In addition, the kernel counter "/proc/net/snmp" in namespace is unchanged. These couters do not work well with namespace?<br><div>
<br><br></div><div>BR,<br></div>Germy</div>