diff --git a/flock/bgp-secondary/bird_dest.conf b/flock/bgp-secondary/bird_dest.conf
index f2fb8336..f17f3127 100644
--- a/flock/bgp-secondary/bird_dest.conf
+++ b/flock/bgp-secondary/bird_dest.conf
@@ -14,8 +14,8 @@ protocol kernel kernel6 {
 }
 
 protocol bgp LINK {
-  local {{ link["dest"]["ipv6"].ip }} as 2;
-  neighbor {{ link["src"]["ipv6"].ip }} as 1;
+  local {{ links["L"]["dest"]["ipv6"].ip }} as 2;
+  neighbor {{ links["L"]["src"]["ipv6"].ip }} as 1;
   ipv6 {
     import all;
     export none;
diff --git a/flock/bgp-secondary/bird_src.conf b/flock/bgp-secondary/bird_src.conf
index 86051baf..445f71ec 100644
--- a/flock/bgp-secondary/bird_src.conf
+++ b/flock/bgp-secondary/bird_src.conf
@@ -89,8 +89,8 @@ function CHECK() -> bool {
 }
 
 protocol bgp LINK {
-  local {{ link["src"]["ipv6"].ip }} as 1;
-  neighbor {{ link["dest"]["ipv6"].ip }} as 2;
+  local {{ links["L"]["src"]["ipv6"].ip }} as 1;
+  neighbor {{ links["L"]["dest"]["ipv6"].ip }} as 2;
   ipv6 {
     import none;
     export where CHECK();
diff --git a/flock/bgp-secondary/test.py b/flock/bgp-secondary/test.py
index 3c4ea919..75474c27 100644
--- a/flock/bgp-secondary/test.py
+++ b/flock/bgp-secondary/test.py
@@ -22,6 +22,9 @@ class ThisTest(Test):
                 "src", "dest",
                 t=BIRDInstance,
                 )
+        self.links = {
+                "L": await self.link("L", "src", "dest")
+                }
 
 async def main():
     t = ThisTest(name)
@@ -29,33 +32,18 @@ async def main():
 
     h = t.hypervisor
 
-    link, = await asyncio.gather(
-            h.control_socket.send_cmd("link", "L", {
-                "machines": {
-                    "src": { "name": "L" },
-                    "dest": { "name": "L" },
-                    },
-                "ipv6": "2001:db8:0:1::/64",
-                "ipv4": "10.0.1.0/29",
-                }),
-            )
-
-    for m in link:
-        for i in ("ipv4", "ipv6"):
-            link[m][i] = ipaddress.ip_interface(link[m][i])
-
-    print(link, t.src, t.dest)
+    print(t.links, t.src, t.dest)
 
     env = jinja2.Environment()
     src_conf = open("bird_src.conf", "r").read()
     jt = env.from_string(src_conf)
     with open(t.src.workdir / "bird.conf", "w") as f:
-        f.write(jt.render( link=link ))
+        f.write(jt.render( links=t.links ))
 
     dest_conf = open("bird_dest.conf", "r").read()
     jt = env.from_string(dest_conf)
     with open(t.dest.workdir / "bird.conf", "w") as f:
-        f.write(jt.render( link=link ))
+        f.write(jt.render( links=t.links ))
 
     print(await asyncio.gather(*[
         h.control_socket.send_cmd("run_in", where, "./bird", "-l")
diff --git a/flock/lib/BIRD/Test.py b/flock/lib/BIRD/Test.py
index cd8b2515..52a48844 100644
--- a/flock/lib/BIRD/Test.py
+++ b/flock/lib/BIRD/Test.py
@@ -1,4 +1,5 @@
 import asyncio
+import ipaddress
 import os
 import pathlib
 import sys
@@ -75,7 +76,13 @@ class BIRDInstance(CLI):
         self.bindir.copy(self.workdir)
 
 class Test:
-    machines_start = {}
+    ipv6_prefix = ipaddress.ip_network("2001:db8::/32")
+    ipv4_prefix = ipaddress.ip_network("192.0.2.0/24")
+
+    ipv6_link_pxlen = 64
+    ipv4_link_pxlen = 28
+
+    # 198.51.100.0/24, 203.0.113.0/24
 
     def __init__(self, name):
         self.name = name
@@ -83,6 +90,9 @@ class Test:
         self._started = asyncio.Future()
         self._starting = False
 
+        self.ipv6_pxgen = self.ipv6_prefix.subnets(new_prefix=self.ipv6_link_pxlen)
+        self.ipv4_pxgen = self.ipv4_prefix.subnets(new_prefix=self.ipv4_link_pxlen)
+
     async def hcom(self, *args):
         if self._started.done():
             return await self.hypervisor.control_socket.send_cmd(*args)
@@ -114,3 +124,23 @@ class Test:
                     )) for n,i in zip(names, info)
                 ]
 
+    async def link(self, name, *machines):
+        match len(machines):
+            case 0:
+                raise Exception("Link with no machines? HOW?!")
+            case 1:
+                raise NotImplementedError("dummy link")
+            case 2:
+                linfo = await self.hcom("link", name, {
+                    "machines": { m: { "name": name } for m in machines },
+                    "ipv6": str(next(self.ipv6_pxgen)),
+                    "ipv4": str(next(self.ipv4_pxgen)),
+                    })
+                for m in machines:
+                    for i in ("ipv4", "ipv6"):
+                        linfo[m][i] = ipaddress.ip_interface(linfo[m][i])
+
+                return linfo
+
+            case _:
+                raise NotImplementedError("virtual bridge")