From 156b6384f2f2f931d339dae3eff41eadff18359c Mon Sep 17 00:00:00 2001
From: Dante Catalfamo
Date: Fri, 10 Jul 2020 18:40:41 -0400
Subject: Add details for DHCP
---
content/posts/WIP-openbsd-dhcp-server/index.org | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/content/posts/WIP-openbsd-dhcp-server/index.org b/content/posts/WIP-openbsd-dhcp-server/index.org
index 3d40a2b..1ebca82 100644
--- a/content/posts/WIP-openbsd-dhcp-server/index.org
+++ b/content/posts/WIP-openbsd-dhcp-server/index.org
@@ -19,7 +19,7 @@ While I've been an OpenBSD user for years, I'm finally in the process
of replacing the router provided by my ISP with a [[{{< ref "pcengines-comparison" >}}][PC Engines APU2E4]]
running [[{{< ref "installing-openbsd-on-pcengines" >}}][OpenBSD]].
-One of the key services that I have to setup for this is the DHCP
+One of the key services that I have to setup for this is the [[https://en.wikipedia.org/wiki/Dynamic_Host_Configuration_Protocol][DHCP]]
server, which is responsible for giving out IP addresses to machines
when they join the network.
@@ -43,6 +43,9 @@ use =192.168.0.23= as the DNS server, as I have a caching DNS server
which filters out advertisers setup at that address, with =8.8.8.8= as
the secondary DNS server in case my DNS server ever goes down.
+I'll also set the default lease time to one week, and the maximum
+lease time to one month.
+
To jumpstart the configuration, I'll first copy the file from
=/etc/examples/dhcpd.conf= to =/etc/dhcpd.conf= so I don't have to
start from scratch.
@@ -123,7 +126,9 @@ range 192.168.0.30 192.168.0.200;
I also specify the default lease time and max lease time. The default
lease time is the number of seconds the DHCP server will hold a lease
for a client if the client doesn't ask for a specific lease length,
-and the max lease length is the maximum allowed lease length.
+and the max lease length is the maximum allowed lease length. Here I
+set the default to 604800 (one week), and the max to 2592000 (one
+month).
#+BEGIN_SRC
default-lease-time 604800;
@@ -148,3 +153,6 @@ To run the DHCP server, we first enable, then start it using =rcctl=.
doas rcctl enable dhcpd
doas rcctl start dhcpd
#+END_SRC
+
+To check the leases the =dhcpd= is currently holding, you can check
+out =/var/db/dhcpd.leases=.
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