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["stan.pao" <1786408@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

  lan1 192.168.252.0/24
   |
   |  192.168.252.1
   |  172.77.3.39 floatingip
 qrouter
   |  172.88.1.39
   |
   |
internet
   |
   |
   |  172.88.1.38
 qrouter
   |  172.77.3.38 floatingip
   |  192.168.253.1
   |
  lan2 192.168.253.0/24
After setting up ipsec-tunnel successfully,lan1 can ping lan2.Then shut down qrouter external gateway v-interface and re-up,ipsec-site-connection keep alive and ipsec whack checking is normal,but lan1 can't ping lan2 this time.Using 'ip netns exec route -n' to check,some important routing entry missing leading communication-failure,just like the below sample.Although the defaulting-routing entry exists,communication is failed:
[before re-uping]
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         172.88.1.254    0.0.0.0         UG    0      0        0 qg-8889b596-a5
172.77.3.0      0.0.0.0         255.255.255.0   U     0      0        0 qg-8889b596-a5
172.77.3.38     0.0.0.0         255.255.255.255 UH    0      0        0 *
172.88.1.0      0.0.0.0         255.255.255.0   U     0      0        0 qg-8889b596-a5
192.168.252.0   172.88.1.254    255.255.255.0   UG    0      0        0 qg-8889b596-a5 ⭐-->will missing
192.168.253.0   0.0.0.0         255.255.255.0   U     0      0        0 qr-799ac9c5-58

[after re-uping]
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         172.88.1.254    0.0.0.0         UG    0      0        0 qg-8889b596-a5
172.77.3.0      0.0.0.0         255.255.255.0   U     0      0        0 qg-8889b596-a5
172.77.3.38     0.0.0.0         255.255.255.255 UH    0      0        0 *
172.88.1.0      0.0.0.0         255.255.255.0   U     0      0        0 qg-8889b596-a5
192.168.253.0   0.0.0.0         255.255.255.0   U     0      0        0 qr-799ac9c5-58

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1786408

Title:
  IPsec shutdown and re-up the external-interface ,routing missing

Status in neutron:
  New

Bug description:
    lan1 192.168.252.0/24
     |
     |  192.168.252.1
     |  172.77.3.39 floatingip
   qrouter
     |  172.88.1.39
     |
     |
  internet
     |
     |
     |  172.88.1.38
   qrouter
     |  172.77.3.38 floatingip
     |  192.168.253.1
     |
    lan2 192.168.253.0/24
  After setting up ipsec-tunnel successfully,lan1 can ping lan2.Then shut down qrouter external gateway v-interface and re-up,ipsec-site-connection keep alive and ipsec whack checking is normal,but lan1 can't ping lan2 this time.Using 'ip netns exec route -n' to check,some important routing entry missing leading communication-failure,just like the below sample.Although the defaulting-routing entry exists,communication is failed:
  [before re-uping]
  Kernel IP routing table
  Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
  0.0.0.0         172.88.1.254    0.0.0.0         UG    0      0        0 qg-8889b596-a5
  172.77.3.0      0.0.0.0         255.255.255.0   U     0      0        0 qg-8889b596-a5
  172.77.3.38     0.0.0.0         255.255.255.255 UH    0      0        0 *
  172.88.1.0      0.0.0.0         255.255.255.0   U     0      0        0 qg-8889b596-a5
  192.168.252.0   172.88.1.254    255.255.255.0   UG    0      0        0 qg-8889b596-a5 ⭐-->will missing
  192.168.253.0   0.0.0.0         255.255.255.0   U     0      0        0 qr-799ac9c5-58

  [after re-uping]
  Kernel IP routing table
  Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
  0.0.0.0         172.88.1.254    0.0.0.0         UG    0      0        0 qg-8889b596-a5
  172.77.3.0      0.0.0.0         255.255.255.0   U     0      0        0 qg-8889b596-a5
  172.77.3.38     0.0.0.0         255.255.255.255 UH    0      0        0 *
  172.88.1.0      0.0.0.0         255.255.255.0   U     0      0        0 qg-8889b596-a5
  192.168.253.0   0.0.0.0         255.255.255.0   U     0      0        0 qr-799ac9c5-58

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