> That's great, except when you need *two* bridges, for two
> independent subnets, and there is no, as far as I can see, peth1.
You can have multiple vethX interfaces on recent builds -- see
netback/loopback.c.
I think the current default is a rather miserly 1 (and should be increased),
but can be set on the command line.
Ian
> Em Wednesday 14 September 2005 16:30, John Wilson escreveu:
> > Yo,
> >
> > I had big problems with this myself, but now as far as I can tell,
> > veth0 (renamed to eth0 in the v recent releases) is the virtual nic
> > for dom0 which corresponds to the virtual eth0 nics in the
> domU's (the
> > physical nic itself has been renamed to peth0).
> >
> > The vifU.N's are the dom0 links to the virtual nics ethN in
> domU, and
> > aren't to be treated as proper network interfaces in thier
> own right.
> > If you assign an IP address to, say, vif1.0 and attempt to
> communicate
> > with eth0 in dom1, you can ping between them and such, but
> ssh nor vnc
> > wont work, complaining for the most part about bad checksums.
> >
> > The vif0.0 interface in dom0 is linked to dom0's virtual nic, veth0
> > (or eth0 in the recent builds).
> >
> > Now... The correct way to interface the cards and provide
> connectivity
> > between the domains and the outside world is to attach all
> the vifU.N
> > interfaces to a bridge in dom0 (normally xen-br0) together with the
> > physical nic, eth0 (or peth0 recently). IP addresses are
> then assigned
> > to the eth0 links and inter-domain sshing, vncing and communication
> > with the outside world all result.
> >
> > Here's a badly drawn diagram to illustrate...
> >
> > ____________________________ _____________________
> >
> > |dom0 | |dom1 |
> > | _______ | | ________ |
> > |
> > | |eth0 | | | |eth0 | |
> > | |IP_____| +--------------+-------+------|IP______| |
> > |
> > | ____|_______|_____________ | | |
> > |
> > || ___|___ ___|___ _______ || | |
> > ||
> > |||vif0.0 |vif1.0 |peth0 | || | |
> > |||_______|_______|_______| || | |
> > ||
> > ||xen-br0_____________|_____|| | |
> > |
> > |_____________________|______| |_____________________|
> >
> > ______________________|_____________________>>LAN>>>
> >
> >
> > I've used eth0 as the virtual nics and peth0 as the physical nic.
> > IP has been used to denote devices with an IP address. All the
> > interfaces there are automatically generated by Xen, and I used
> > ifconfig to statically set IP addresses (because I was
> having trouble
> > with our lab DHCP server, although it was assigning
> addresses to the
> > correct cards), and brctl addif xen-br0 vif1.0 etc. to add
> the vifs to
> > the bridge, because for some reason Xen wasn't...
> >
> > Well thats my contribution for this evening.
> >
> >
> >
> > John
> >
> >
> >
> > P.S. Official documentation/Howto/wiki is a little on the
> sparse side
> > for this Ian.
> >
> > Quoting Anthony.Golia@xxxxxxxxxxxxxxxxx:
> > > On Thu, 8 Sep 2005, Ian Pratt wrote:
> > >> > Hi. what creates veth0 and vifu.0, when? what's the
> underlying
> > >> > architecture behind them? Just trying to understand the
> > >> > internals.
> > >>
> > >> netback/loopback.c creates them.
> > >>
> > >> It's effectively a point to point link, allowing domain 0 to
> > >> connect on to the bridge in the same manner that other
> domains do.
> > >> (before, packets to domain 0 were short-cutted and came off the
> > >> bridge directly, which could lead to traffic from other domains
> > >> being stalled if a lot of traffic was destined to user
> space in dom0.
> > >
> > > thx. what's the diff betwn the two (veth0 and vifu.0) ?
> > >
> > >> Best,
> > >> Ian
> > >>
> > >> )
> > >
> > > Cheers,
> > > Anthony
> > >
> > > _______________________________________________
> > > Xen-users mailing list
> > > Xen-users@xxxxxxxxxxxxxxxxxxx
> > > http://lists.xensource.com/xen-users
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
>
> --
> Ramiro Brito Willmersdorf Dep. Engenharia Mecânica/UFPE
> ramiro@xxxxxxxxxxxxxxxx tel: +55 81 2126-8231e239
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users
>
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