On Fri, Mar 06, 2026 at 02:23:32PM +0100, Frans Schneider wrote: > > Op 06-03-2026 om 2:12 p.m. schreef Dave Voutila: > > Frans Schneider <[email protected]> writes: > > > > > Somehow I can't get networking to work under virtualization. Probably > > > a simple mistake, but I can't find it. > > > > > > On an old Dell laptop (> 15 years old) I performed a completely fresh > > > 7.8 install. Everything is default. > > > I configure a bridge: > > > > > > add em0 > > > up > > > > > > and em0: > > > > > > inet autoconf > > > up > > > > > > Output of ifconfig: > > > > > > em0: > > > flags=808b43<UP,BROADCAST,RUNNING,PROMISC,ALLMULTI,SIMPLEX,MULTICAST,AUTOCONF4> > > > mtu 1500 > > > lladdr 5c:26:0a:13:52:0a > > > index 1 priority 0 llprio 3 > > > groups: egress > > > media: Ethernet autoselect (1000baseT > > > full-duplex,master,rxpause,txpause) > > > status: active > > > inet 192.168.178.118 netmask 0xffffff00 broadcast 192.168.178.255 > > > > > > bridge0: flags=41<UP,RUNNING> mtu 1500 > > > description: switch1-uplink > > > index 5 llprio 3 > > > groups: bridge > > > priority 32768 hellotime 2 fwddelay 15 maxage 20 holdcnt 6 proto rstp > > > designated: id 00:00:00:00:00:00 priority 0 > > > tap0 flags=3<LEARNING,DISCOVER> > > > port 7 ifpriority 0 ifcost 0 > > > em0 flags=3<LEARNING,DISCOVER> > > > port 1 ifpriority 0 ifcost 0 > > > Addresses (max cache: 100, timeout: 240): > > > > > > vm.conf contains: > > > > > > switch "uplink" { > > > interface bridge0 > > > } > > > > > > # OpenBSD snapshot install test > > > vm "openbsd.vm" { > > > enable > > > memory 1G > > > disk "/var/vmm/images/obsd.qcow2" > > > cdrom "/var/vmm/iso/install78.iso" > > > interface {switch "uplink"} > > > } > > > > > > After starting the vm, ifconfig on the vm shows: > > > > > > vio0: > > > flags=808b43<UP,BROADCAST,RUNNING,PROMISC,ALLMULTI,SIMPLEX,MULTICAST,AUTOCONF4> > > > mtu 1500 > > > lladdr fe:e1:bb:d1:0c:f8 > > > llprio 3 > > > groups: dhcp > > > media: Ethernet autoselect > > > status: active > > > > > > So far everything looks fine, but no matter what I do, I can't get any > > > network traffic to the network. > > > > > Which network? The internet? > Neither local LAN or internet. Total silence. > > > > > I've tried both Alpine virtual and standard, and OpenBSD in the meantime. > > > > > > On the host I've tried bridging and veb as described in the FAQ, but > > > without success. > > > > > > What could be wrong? > > Did you follow the examples for /etc/pf.conf and configured NAT? > Since I use bridging (or veb), the firewall is or should be of no concern > (?) I made no changes to pf.conf from the default install. > > I did use both the OpenBSD FAQ (Networking -> Option 4 VMs on the real > network and the OpenBSD Handbook Virtualization -> Setting Up Bridged > Networking. > > >
does your upstream dhcp server (the one that gave em0 its address) give out more than one address per port/connection? It's going to see what amounts to two different dhcp requests with different mac addresses on em0 in this config, I think. when the vm is looking for an address, what does tcpdump on tap0 and/or bridge0 / em0 on the host show? can you see dhcp requests and responses flowing?
