D-125: Model B per-DC ISP egress (bridge-in, single-NAT) -- resolves OBS-3 design gap
...
OBS-3: Model B nesting put vr1-dc0-wan (a libvirt NAT) inside vvr1-dc0, whose
only leg is the SEC-010 FORWARD-dropped transit -- so the per-DC simulated ISP
had no egress. Operator ruled bridge-in (single-NAT) over double-NAT.
- modules/wan-bridge (NEW): libvirt forward=bridge onto a pre-existing host
bridge (bridge={name}, schema measured from the provider, not guessed). No
subnet/NAT. Sibling to site-wan so every NAT user stays untouched. Covered by
opentofu-validate S3 (standalone PASS).
- OUTER root: vcloud ISP NAT vr1_dc0_uplink (the single NAT) + a 2nd IP-less
uplink NIC on vvr1-dc0 + the br-vr1-dc0-wan bridge declared in netplan (transit
stays NIC1 so SEC-010/--transit-if keep keying on it). New HELD var
vr1_dc0_uplink_cidr (no default; office1-netbox apex, hard rule 2).
- INNER root: vr1_dc0_wan site-wan(NAT) -> wan-bridge onto br-vr1-dc0-wan;
OPNsense WAN re-addresses into the vcloud ISP /24 (edge config, D-113, HELD).
- Bootstrap (site-headend-install.sh): --uplink-if/--wan-bridge; --check verifies
the bridge exists + uplink ENSLAVED (fail-open guard, same class as the transit
check); SEC-010 rationale corrected (bridge-in has no inner NAT) + br_netfilter
CONSTRAINT (keep the FORWARD-drop interface-scoped, NEVER global). Harness 49->54.
Records: D-125 (new); D-122 amendment (forward-pointer -- WAN realization
superseded, intent stands); SEC-010 (br_netfilter + hardened --check);
model-a-fallback B->A delta item 8 + revert; platform-traps 1g (bridge +
br_netfilter + nested-foreign-MAC trap).
NOT closed: the L2-NAT-of-foreign-MAC path is a DEPLOY-TIME gate (bridge-in
equivalent of the depth-4 boot gate); fallback = double-NAT. HELD: vr1_dc0_uplink_cidr
+ OPNsense WAN re-address. Both roots validate; gauntlet ALL GREEN (63); repo-lint
0 fail. Present-only; NOT pushed.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ck6xh3jWQi5b3Su8Dx1LEH
