Host-Only networks and IPv6 - host <-> VM traffic not possible (IPv4 works fine)

Discussion in 'General Questions' started by ChrisJ30, Jan 18, 2022.

  1. ChrisJ30

    ChrisJ30 Bit Poster

    Messages:
    1
    I am migrating several VMs (Windows and Linux) from VirtualBox to Parallels Desktop Pro for Mac. I use IPv6 extensively and also host-only networking extensively. Under VirtualBox, if I configure a host-only network for IPv6 then the various VMs 'connected' to that network can communicate with each other via IPv6 but also the host and VMs can communicate with each other via IPv6. This is as expected and as required.

    Under Parallels Pro, if I configure the exact same kind of setup then I find that the VMs can communicate with each other via IPv6 but there is no functional communication between the host and the VMs via IPv6. IPv4 works just fine.

    This is quite a problem for me. Am I missing some 'trick' here or is this capability not present for IPv6 in Parallels Desktop Pro? All of the VMs in question are using Virtio network adapters. The Linux OS are Oracle Linux (RedHat/CentOS) 7 and 8 while Windows is Windows 11. macOS version is 12.1.

    I suspect that part of the problem is that the host level 'bridgeXXX' interface that gets created for the host-only network has full IPv4 addressing configured but only link-level IPv6. configured. If I manually assign the host interface a suitable IPv6 address using ifconfig then I get variouss errors when I try e.g. ping such as

    PING6(56=40+8+8 bytes) 2020:100:100:200::10 --> 2020:100:100:200::51
    ping6: sendmsg: No buffer space available
    ping6: wrote 2020:100:100:200::51 16 chars, ret=-1
    ping6: sendmsg: No buffer space available
    ping6: wrote 2020:100:100:200::51 16 chars, ret=-1

    There is a suitable route setup:

    2020:100:100:200::/64 link#28 UC bridge101
    2020:100:100:200::10 3a.f9.d3.7d.b4.65 UHL lo0
    2020:100:100:200::51 link#28 UHLWI bridge101

    (10 is the host, 51 a Linux VM)

    I really need to get this working...
     

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