hostagent usernet binds UDP port 68 to all interfaces, breaks host DHCP #4501
Description
Description
Description
Lima hostagent binds to *:68 (UDP bootpc) which intercepts DHCP OFFER
packets meant for the host's real network interface (WiFi), breaking
host DHCP lease renewal.
Lima version
limactl version 2.0.3
Environment
- macOS (Intel Mac, 2020)
- vmType: qemu
- hostResolver.enabled: false (also tried true, no difference)
Evidence
$ sudo lsof -i :68
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
limactl 39640 user 11u IPv6 ... 0t0 UDP *:bootpc
Effect
DHCP server logs show Mac stuck in DISCOVER/OFFER loop:
- Mac sends DHCPDISCOVER
- Server responds with DHCPOFFER
- Mac never sends DHCPREQUEST (Lima intercepts the OFFER)
- Loop repeats 10-50 times over several minutes
- Occasionally completes by chance
Stopping Lima immediately restores normal DHCP operation.
Expected behavior
The usernet DHCP server should bind only to the VM's virtual network
interface, not *:68 on all host interfaces.
Related
This appears to be in gvisor-tap-vsock's DHCP server binding behavior.