Replace all post_url with Hugo ref blocks

content/articles/2023-02-24-coloclue-vpp-2.md

@@ -12,10 +12,10 @@ title: 'Case Study: VPP at Coloclue, part 2'
 Almost precisely two years ago, in February of 2021, I created a loadtesting environment at
 [[Coloclue](https://coloclue.net)] to prove that a provider of L2 connectivity between two
 datacenters in Amsterdam was not incurring jitter or loss on its services -- I wrote up my findings
-in [[an article]({% post_url 2021-02-27-coloclue-loadtest %})], which demonstrated that the service
+in [[an article]({{< ref "2021-02-27-coloclue-loadtest" >}})], which demonstrated that the service
 provider indeed provides a perfect service. One month later, in March 2021, I briefly ran
 [[VPP](https://fd.io)] on one of the routers at Coloclue, but due to lack of time and a few
-technical hurdles along the way, I had to roll back [[ref]({% post_url 2021-03-27-coloclue-vpp %})].
+technical hurdles along the way, I had to roll back [[ref]({{< ref "2021-03-27-coloclue-vpp" >}})].
 
 ## The Problem
 
@@ -169,7 +169,7 @@ I've now ensured that traffic to and from 185.52.227.1 will always traverse thro
 I've written about this before, the general _spiel_ is just following my previous article (I'm
 often very glad to read back my own articles as they serve as pretty good documentation to my
 forgetful chipmunk-sized brain!), so here, I'll only recap what's already written in
-[[vpp-7]({% post_url 2021-09-21-vpp-7 %})]:
+[[vpp-7]({{< ref "2021-09-21-vpp-7" >}})]:
 
 1.  Build VPP with Linux Control Plane
 1.  Bring `eunetworks-2` into maintenance mode, so we can safely tinker with it
@@ -656,7 +656,7 @@ The performance of the one router we upgraded definitely improved, no question a
 there's a couple of things that I think we still need to do, so Rogier and I rolled back the change
 to the previous situation and kernel based routing.
 
-*   We didn't migrate keepalived, although IPng runs this in our DDLN [[colocation]({% post_url 2022-02-24-colo %})]
+*   We didn't migrate keepalived, although IPng runs this in our DDLN [[colocation]({{< ref "2022-02-24-colo" >}})]
     site, so I'm pretty confident that it will work.
 *   Kees and Ansible at Coloclue will need a few careful changes, to facilitate ongoing automation,
     think of dataplane and controlplane firewalls, sysctls (uRPF et al), fastnetmon, and so on will