labsim/vlan-leak-evidence/after/client.txt

udhcpc: started, v1.37.0
udhcpc: broadcasting discover
udhcpc: broadcasting select for 172.31.3.11, server 172.31.3.252
udhcpc: lease of 172.31.3.11 obtained from 172.31.3.252, lease time 85374
labsim: prove the tagged-Management fix for kea's wrong-pool offers Kea #1117: with dhcp-socket-type raw, a frame tagged for a sub-interface is also delivered to the parent's AF_PACKET socket, and if the parent serves a subnet kea answers from it too. Management being the native VLAN on bond0 is what gives the parent that subnet. One DISCOVER on VLAN 3 produced two OFFERs, and in the captures here the WRONG one arrives first as often as not -- which is why this looked device-dependent rather than like a server bug. labsim-vlan-leak-test.sh reproduces it and scores the SERVER's offers, not the client's choice; a client picking correctly is how this hid. Fails on the old shape, passes on the new one across all six LAN VLANs. Three things the rehearsal caught that reasoning had not: - kea keeps its old raw socket. VyOS does not restart it for an interface address change, so the first post-fix test failed and looked exactly like the fix not working. - interface-group LAN names the bare bond0. Moving the address without moving the group drops every management session under default-deny. - there is no make-before-break. A port always egresses its native VLAN untagged, so while VLAN 1 is native the router can send tagged VLAN 1 but never receive it -- verified, the ARP landed on bond0 untagged. What makes the cutover safe anyway is that tagged and untagged Management coexist, so the firewalls convert one at a time: 0s of VIP downtime, versus 5m30s if both routers go before the switch does. In that state the healthy BACKUP does NOT take over -- the sync group holds native BACKUP because the other VLANs still hear the master. Also fixes two ways the sim was lying. ovs_bond_router compared only the trunk VLAN list on re-runs, so a VM restart left the bond holding taps that no longer existed while the real ones sat in the bridge unbonded -- labsim-vyos2 had no LACP at all. And the tap count included the primary's libvirt-NAT scaffold NIC, so the primary's bond was skipped outright. Runbook: migration/MANAGEMENT-VLAN-TAGGED.md Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01DMVzWZgiKW2wquf5z8S1yH 2026-09-02 14:03:44 +01:00			`udhcpc: started, v1.37.0`
			`udhcpc: broadcasting discover`
			`udhcpc: broadcasting select for 172.31.3.11, server 172.31.3.252`
			`udhcpc: lease of 172.31.3.11 obtained from 172.31.3.252, lease time 85374`