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Move the DMZ VPCs into RFC 1918 space #3

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benvin merged 1 commits from benvin/vpc-rfc1918 into main 2026-10-16 22:37:21 +11:00
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+9 -21
2 changed files with 9 additions and 21 deletions
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README.md
+2 -3
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@@ -23,12 +23,11 @@ role in terraform-vault.
## Mail edge
Each DMZ VPC (`syd` 198.18.30.0/24, `mel` 198.18.31.0/24) holds a postfix edge host and a vpn host. The vpn
Each DMZ VPC (`syd` 172.18.30.0/24, `mel` 172.18.31.0/24) holds a postfix edge host and a vpn host. The vpn
host runs wg0 as a /31 point-to-point link to its own prodnxsr0020 interface
(`wg-syd` on 51821, `wg-mel` on 51822; `router_links` output) and forwards the
lab routes for its VPC; the edge host reaches the lab through it and has no
WireGuard. The VPC /24 is connected on both hosts, so it wins over the lab
198.18.0.0/16 route via the vpn host. Link /31s and vpn loopbacks (dum0) come from 198.18.2.160/27. Lab
WireGuard. Link /31s and vpn loopbacks (dum0) come from 198.18.2.160/27. Lab
traffic is sourced from the /31 until Puppet brings up FRR, which peers OSPF
over wg0 and advertises the loopback and VPC to the router. Router keys live at `kv/service/wireguard/binarylane/prodnxsr0020-<region>`.
wg0 is bootstrapped from a key in `user_data` (readable via the BinaryLane
modules/binarylane/main.tf
+7 -18
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@@ -10,33 +10,22 @@ locals {
"10.10.12.200/32", # management ssh host
]
# vpc route entries must not overlap the vpcs themselves: the /16 minus 198.18.30.0/23
vpc_lab_routes = concat([
"198.18.0.0/20",
"198.18.16.0/21",
"198.18.24.0/22",
"198.18.28.0/23",
"198.18.32.0/19",
"198.18.64.0/18",
"198.18.128.0/17",
], [for dst in local.lab_routes : dst if dst != "198.18.0.0/16"])
# ospf hellos over the p2p links; wg has one peer per interface so this routes to it
ospf_allspf = "224.0.0.5/32"
vpcs = {
syd = "198.18.30.0/24"
mel = "198.18.31.0/24"
syd = "172.18.30.0/24"
mel = "172.18.31.0/24"
}
vpns = {
ausyd2nxvm2131 = { region = "syd", vpc_ip = "198.18.30.11", router_port = 51821, router_address = "198.18.2.176", wg_address = "198.18.2.177", loopback = "198.18.2.161" }
aumel1nxvm2133 = { region = "mel", vpc_ip = "198.18.31.11", router_port = 51822, router_address = "198.18.2.178", wg_address = "198.18.2.179", loopback = "198.18.2.162" }
ausyd2nxvm2131 = { region = "syd", vpc_ip = "172.18.30.11", router_port = 51821, router_address = "198.18.2.176", wg_address = "198.18.2.177", loopback = "198.18.2.161" }
aumel1nxvm2133 = { region = "mel", vpc_ip = "172.18.31.11", router_port = 51822, router_address = "198.18.2.178", wg_address = "198.18.2.179", loopback = "198.18.2.162" }
}
edges = {
ausyd2nxvm2130 = { region = "syd", vpc_ip = "198.18.30.10", vpn = "ausyd2nxvm2131", ptr = "mta1.edge.unkin.net" }
aumel1nxvm2132 = { region = "mel", vpc_ip = "198.18.31.10", vpn = "aumel1nxvm2133", ptr = "mta2.edge.unkin.net" }
ausyd2nxvm2130 = { region = "syd", vpc_ip = "172.18.30.10", vpn = "ausyd2nxvm2131", ptr = "mta1.edge.unkin.net" }
aumel1nxvm2132 = { region = "mel", vpc_ip = "172.18.31.10", vpn = "aumel1nxvm2133", ptr = "mta2.edge.unkin.net" }
}
}
@@ -51,7 +40,7 @@ resource "binarylane_vpc_route_entries" "dmz" {
for_each = local.vpns
vpc_id = binarylane_vpc.dmz[each.value.region].id
route_entries = [for dst in local.vpc_lab_routes : {
route_entries = [for dst in local.lab_routes : {
description = "lab via ${each.key}"
destination = dst
router = binarylane_server.vpn[each.key].private_ipv4_addresses[0]