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[Bug 1549311] [NEW] Unexpected SNAT behavior between instances with DVR+floating ip

 

Public bug reported:

This might be related with [1]. The fix in [1] should be applied to
dvr_local_router.

= Scenario =

• Latest code
• Single Neutron DVR router, multiple hosts
• two instances in two tenant networks attached to DVR router, the two instances are in two different hosts
• Instance A has a floatingip

INSTANCE A: TestNet1=100.0.0.4, 172.168.1.53
INSTANCE B: TestNet2=100.0.1.4

Pinging from INSTANCE A to INSTANCE B:
tcpdump from Instance B
[root@dvr-compute2 fedora]# tcpdump -ni qr-ca45d1e3-5d icmp
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on qr-ca45d1e3-5d, link-type EN10MB (Ethernet), capture size 262144 bytes
14:31:54.054629 IP 100.0.1.4 > 172.168.1.53: ICMP echo reply, id 18433, seq 0, length 64


[1] https://bugs.launchpad.net/neutron/+bug/1505781

** Affects: neutron
     Importance: Undecided
     Assignee: Hong Hui Xiao (xiaohhui)
         Status: New

** Changed in: neutron
     Assignee: (unassigned) => Hong Hui Xiao (xiaohhui)

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https://bugs.launchpad.net/bugs/1549311

Title:
  Unexpected SNAT behavior between instances with DVR+floating ip

Status in neutron:
  New

Bug description:
  This might be related with [1]. The fix in [1] should be applied to
  dvr_local_router.

  = Scenario =

  • Latest code
  • Single Neutron DVR router, multiple hosts
  • two instances in two tenant networks attached to DVR router, the two instances are in two different hosts
  • Instance A has a floatingip

  INSTANCE A: TestNet1=100.0.0.4, 172.168.1.53
  INSTANCE B: TestNet2=100.0.1.4

  Pinging from INSTANCE A to INSTANCE B:
  tcpdump from Instance B
  [root@dvr-compute2 fedora]# tcpdump -ni qr-ca45d1e3-5d icmp
  tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
  listening on qr-ca45d1e3-5d, link-type EN10MB (Ethernet), capture size 262144 bytes
  14:31:54.054629 IP 100.0.1.4 > 172.168.1.53: ICMP echo reply, id 18433, seq 0, length 64

  
  [1] https://bugs.launchpad.net/neutron/+bug/1505781

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