(Forwarding this because I accidentally fat-fingered the "Reject" button in hyperkitty)
----- Forwarded message from Stefano Brivio <sbri...@redhat.com> ----- Date: Tue, 24 Jun 2025 15:31:45 +0200 From: Stefano Brivio <sbri...@redhat.com> To: "Richard W.M. Jones" <rjo...@redhat.com> Cc: "Aithal, Srikanth" <srait...@amd.com>, guestfs@lists.libguestfs.org Subject: Re: appliance not getting ipv4 assigned when host kernel has CONFIG_IPV6_SIT builtin On Tue, 24 Jun 2025 14:03:17 +0100 "Richard W.M. Jones" <rjo...@redhat.com> wrote: > On Tue, Jun 24, 2025 at 02:33:43PM +0200, Stefano Brivio wrote: > > On Tue, 24 Jun 2025 13:15:58 +0100 > > "Richard W.M. Jones" <rjo...@redhat.com> wrote: > > > If passt is like slirp, then it would originate connections itself > > > (ie. calling connect(2) on the host side), so I don't understand how > > > the address family would be relevant. > > > > Indeed, it does that, but it needs to pass an address (including family) > > to connect(2), and that's the destination address of the original > > connection as seen from the guest. You can't connect to 88.198.0.164 > > using IPv6. > > OK I see, thanks. Isn't there some IPv4-in-IPv6 thing passt could do > in this case? CLAT (once implemented), but not in this case, because there's no IPv6 connectivity on the host, and no IPv6 connectivity in the guest either (because init/appliance is missing the 'ip link $iface up' I mentioned). > Or could passt choose the right address family to use > in connect(2) based on the address that the appliance passes across? It already does that... nothing would work otherwise. But here passt is getting no traffic at all. > I think also we're confusing what happens on the host with what > happens in the appliance a bit (or maybe I am). Inside the appliance > I'd like to go for this simple change: > > - iface=$(ls -I all -I default -I lo /proc/sys/net/ipv4/conf) > + iface=$(ls -I all -I default -I lo -I sit0 /proc/sys/net/ipv4/conf) > > Is there anything that needs to happen on the host side? No, not really. -- Stefano ----- End forwarded message ----- -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com libguestfs lets you edit virtual machines. Supports shell scripting, bindings from many languages. http://libguestfs.org _______________________________________________ Libguestfs mailing list -- guestfs@lists.libguestfs.org To unsubscribe send an email to guestfs-le...@lists.libguestfs.org
