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Re: Best netdev for private comms between VNs?

From: Pascal
Subject: Re: Best netdev for private comms between VNs?
Date: Fri, 24 Dec 2021 09:56:30 +0100

I like VDE (https://github.com/virtualsquare/vde-2) to make my machines communicate with each other.
regards, lacsaP.

Le mar. 21 déc. 2021 à 18:42, Daniel Dawson <danielcdawson@gmail.com> a écrit :
I have a couple of VNs that need to communicate through their own
network. This network needs to not interact with the Internet or,
ideally, even with the host. I've tried a few different netdevs:

  * socket with listen/connect options: Works okay. However, if I
    understand correctly, it requires the guest that is listening to be
    started first? What happens if that guest is shut down for a while;
    can the connection be reestablished without also restarting the
    other guest? If not, that's a little too inflexible. Also, I don't
    think it works if more than two guests need to use that virtual
    network; correct me if I'm wrong, but my tests of that failed, with
    a third guest not being able to communicate.
  * socket with mcast option: Works with multiple guests, with no issue
    of order. However, this gets default-routed on the host. I'm not
    sure if packets make it to the gateway, considering the address is
    multicast with (I think?) no IGMP, but I don't think this is ideal.
  * bridge: Works great, though requires a bit of setup on the host, and
    packets obviously have to go through a bridge on the host. Maybe
    this is okay, but I want to explore other options.
  * hubport: This looks like it might be good (more lightweight??), but
    I can't figure out how to actually use it properly, and I couldn't
    find any information about how to do so. Whenever I try this with
    hubid != 0, I get a warning that it's "not connected to host
    network" (which is what I want, if possible), and guests with the
    same hubid can't actually communicate. I suppose that something
    extra is required (say, extra configuration to set up the additional
    hub somehow?), but it's not obvious to me. What am I missing?

TIA for any help/advice you can provide.

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