Here's the configuration for the interface:
# ifconfig virbr0 virbr0: flags=4355 mtu 1500 inet 192.168.11.1 netmask 255.255.255.255 broadcast 255.255.255.255 ether 52:54:00:99:e3:0d txqueuelen 0 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 0 bytes 0 (0.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 # ip link show virbr0 13: virbr0@NONE: mtu 1500 qdisc noqueue state LOWERLAYERDOWN mode DEFAULT link/ether 52:54:00:99:e3:0d brd ff:ff:ff:ff:ff:ff
I am able to ping, establish TCP connections, etc to 192.168.11.1, but tcpdump reports
0 packets captured 0 packets received by filter 0 packets dropped by kernel
I have discovered that if I assign the address to a veth interface, put it in a network namespace, then attach the other end of the veth pair to the virbr interface, all packets are shown on tcpdump on the virbr interface. However the original question still stands.