Public bug reported:
In Liberty the default option is: prevent_arp_spoofing = True
If a VM is configured with subnet mask different to /24, e.g. a /20, then if an
application is listening to same subnet (but not if it was /24), it won't reply
to arp requests.
For example,
VM A interface is 10.1.2.3/20 and there is an application listening to 10.1.3.4
on the same VM.
VM B interface is 10.1.2.4/20.
If you ping 10.1.3.4 from VM B, neutron will not forward arp reply to VM B. So,
even if both A and B are on the same subnet, they cannot exchange arp requests,
so they cannot connect to applications running.
Ping works if you ping from VM B the VM A in 10.1.2.3.
** Affects: neutron
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1638684
Title:
prevent_arp_spoofing in liberty prevents applications
Status in neutron:
New
Bug description:
In Liberty the default option is: prevent_arp_spoofing = True
If a VM is configured with subnet mask different to /24, e.g. a /20, then if
an application is listening to same subnet (but not if it was /24), it won't
reply to arp requests.
For example,
VM A interface is 10.1.2.3/20 and there is an application listening to
10.1.3.4 on the same VM.
VM B interface is 10.1.2.4/20.
If you ping 10.1.3.4 from VM B, neutron will not forward arp reply to VM B.
So, even if both A and B are on the same subnet, they cannot exchange arp
requests, so they cannot connect to applications running.
Ping works if you ping from VM B the VM A in 10.1.2.3.
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