From: Kristof Provost <kp@FreeBSD.org>
Date: Wed, 26 Feb 2025 20:37:31 +0000 (+0100)
Subject: image: enable keepalives on the reverse ssh tunnel
X-Git-Url: https://git.sigsegv.be/?a=commitdiff_plain;h=3b9fae4e26805a36ad249c257f50ffe018553bd6;p=pennestraat-domotica

image: enable keepalives on the reverse ssh tunnel

We've seen the reverse ssh connection become unusable after some time.
It's assumed this happens because NAT and/or firewall states along the path
time out as there's no traffic. Explicitly enable both SSH and TCP keepalive
mechanisms to avoid this.
---

diff --git a/image/overlay/domotica/etc/rc.d/autossh b/image/overlay/domotica/etc/rc.d/autossh
index cb149bb..e690732 100755
--- a/image/overlay/domotica/etc/rc.d/autossh
+++ b/image/overlay/domotica/etc/rc.d/autossh
@@ -21,6 +21,9 @@ autossh_start()
 	    "AUTOSSH_POLL=120 AUTOSSH_MAXLIFETIME=28800 \
 	    autossh -M 0 -p 2207 -N -R ${control_port}:localhost:22 \
 	    -R ${http_port}:localhost:8123 \
+	    -o ServerAliveCountMax=6 \
+	    -o ServerAliveInterval=15 \
+	    -o TCPKeepAlive=yes \
 	    -o ExitOnForwardFailure=yes \
 	    domotica@kosmos.sigsegv.be"
 }