But if you want speed measurement, you need to craft a script that also triggers speed measurement (with a suitable tool), and then depending on the parsed result, decides to restart the interface.
So I used this script to measure the speed and if necessary, restart the interface:
#!/bin/sh
# Configurations
INTERFACE="wg0" # WireGuard interface name
PRIMARY_TEST_URL="http://ipv4.download.thinkbroadband.com/100MB.zip" # Primary Test URL
BACKUP_TEST_URL="http://proof.ovh.net/files/100Mb.dat" # Backup Test URL
THRESHOLD=150 # Speed threshold in Mbps
# Function to measure download speed
measure_speed() {
URL=$1
SPEED=$(curl -o /dev/null --max-time 10 --silent --write-out '%{speed_download}' $URL)
SPEED_MBPS=$(echo "$SPEED / 1000000 * 8" | bc)
echo "$SPEED_MBPS"
}
# Measure speed from the primary URL
SPEED_MBPS=$(measure_speed $PRIMARY_TEST_URL)
# If the speed is 0 (connection failure), try the backup URL
if [ "$(echo "$SPEED_MBPS == 0" | bc)" -eq 1 ]; then
logger "Primary URL failed, trying backup URL"
SPEED_MBPS=$(measure_speed $BACKUP_TEST_URL)
fi
# Log the measured speed
logger "VPN Speed: ${SPEED_MBPS} Mbps"
# Check if speed is below the threshold
if [ "$(echo "$SPEED_MBPS < $THRESHOLD" | bc)" -eq 1 ]; then
logger "VPN speed is below threshold ($SPEED_MBPS Mbps), restarting WireGuard"
ifdown $INTERFACE
sleep 5
ifup $INTERFACE
else
logger "VPN speed is acceptable ($SPEED_MBPS Mbps)"
fi
The problem is: When I run the script on the openwrt router, I always get slow speeds like 30-50mbit. When I connect my Mac via Wifi to the router, and run the script on my Mac, I get much faster speeds (300mbit). Why? What can we change so that the speedtest properly works on the router?
I think I found a better way then restarting the interface, which leads to problems.
With wireguard there comes this script: wireguard_watchdog:
. /lib/functions.sh
check_peer_activity() {
local cfg=$1
local iface=$2
local disabled
local public_key
local endpoint_host
local endpoint_port
local persistent_keepalive
local last_handshake
local idle_seconds
config_get_bool disabled "${cfg}" "disabled" 0
config_get public_key "${cfg}" "public_key"
config_get endpoint_host "${cfg}" "endpoint_host"
config_get endpoint_port "${cfg}" "endpoint_port"
if [ "${disabled}" -eq 1 ]; then
# skip disabled peers
return 0
fi
persistent_keepalive=$(wg show ${iface} persistent-keepalive | grep ${public_key} | awk '{print $2}')
# only process peers with endpoints and keepalive set
[ -z ${endpoint_host} ] && return 0;
[ -z ${persistent_keepalive} -o ${persistent_keepalive} = "off" ] && return 0;
# skip IP addresses
# check taken from packages/net/ddns-scripts/files/dynamic_dns_functions.sh
local IPV4_REGEX="[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}"
local IPV6_REGEX="\(\([0-9A-Fa-f]\{1,4\}:\)\{1,\}\)\(\([0-9A-Fa-f]\{1,4\}\)\{0,1\}\)\(\(:[0-9A-Fa-f]\{1,4\}\)\{1,\}\)"
local IPV4=$(echo ${endpoint_host} | grep -m 1 -o "$IPV4_REGEX$") # do not detect ip in 0.0.0.0.example.com
local IPV6=$(echo ${endpoint_host} | grep -m 1 -o "$IPV6_REGEX")
[ -n "${IPV4}" -o -n "${IPV6}" ] && return 0;
# re-resolve endpoint hostname if not responding for too long
last_handshake=$(wg show ${iface} latest-handshakes | grep ${public_key} | awk '{print $2}')
[ -z ${last_handshake} ] && return 0;
idle_seconds=$(($(date +%s)-${last_handshake}))
[ ${idle_seconds} -lt 150 ] && return 0;
logger -t "wireguard_monitor" "${iface} endpoint ${endpoint_host}:${endpoint_port} is not responding for ${idle_seconds} seconds, trying to re-resolve hostname"
wg set ${iface} peer ${public_key} endpoint "${endpoint_host}:${endpoint_port}"
}
# query ubus for all active wireguard interfaces
wg_ifaces=$(ubus -S call network.interface dump | jsonfilter -e '@.interface[@.up=true]' | jsonfilter -a -e '@[@.proto="wireguard"].interface' | tr "\n" " ")
# check every peer in every active wireguard interface
config_load network
for iface in $wg_ifaces; do
config_foreach check_peer_activity "wireguard_${iface}" "${iface}"
done
But it only re-resolves when the connection is lost entirely. I'm thinking about how I could rewrite it so that it always tries to re-resolve hostname.
So here goes my solution. I will report later if it works. I create a custom script /usr/bin/wireguard_watchdog_custom:
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
#
# Copyright (C) 2018 Aleksandr V. Piskunov <aleksandr.v.piskunov@gmail.com>.
# Copyright (C) 2015-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
#
# This watchdog script tries to re-resolve hostnames for inactive WireGuard peers.
# Use it for peers with a frequently changing dynamic IP.
# persistent_keepalive must be set, recommended value is 25 seconds.
#
# Run this script from cron every 15th minute:
# echo '*/15 * * * * /usr/bin/wireguard_watchdog_custom' >> /etc/crontabs/root
. /lib/functions.sh
check_peer_activity() {
local cfg=$1
local iface=$2
local disabled
local public_key
local endpoint_host
local endpoint_port
local persistent_keepalive
local last_handshake
local idle_seconds
config_get_bool disabled "${cfg}" "disabled" 0
config_get public_key "${cfg}" "public_key"
config_get endpoint_host "${cfg}" "endpoint_host"
config_get endpoint_port "${cfg}" "endpoint_port"
if [ "${disabled}" -eq 1 ]; then
# skip disabled peers
return 0
fi
persistent_keepalive=$(wg show ${iface} persistent-keepalive | grep ${public_key} | awk '{print $2}')
# only process peers with endpoints and keepalive set
[ -z ${endpoint_host} ] && return 0;
[ -z ${persistent_keepalive} -o ${persistent_keepalive} = "off" ] && return 0;
# skip IP addresses
# check taken from packages/net/ddns-scripts/files/dynamic_dns_functions.sh
local IPV4_REGEX="[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}"
local IPV6_REGEX="\(\([0-9A-Fa-f]\{1,4\}:\)\{1,\}\)\(\([0-9A-Fa-f]\{1,4\}\)\{0,1\}\)\(\(:[0-9A-Fa-f]\{1,4\}\)\{1,\}\)"
local IPV4=$(echo ${endpoint_host} | grep -m 1 -o "$IPV4_REGEX$") # do not detect ip in 0.0.0.0.example.com
local IPV6=$(echo ${endpoint_host} | grep -m 1 -o "$IPV6_REGEX")
[ -n "${IPV4}" -o -n "${IPV6}" ] && return 0;
# re-resolve endpoint hostname if not responding for too long
logger -t "wireguard_monitor" "trying to re-resolve hostname"
echo "wireguard_monitor trying to re-resolve hostname: wg set ${iface} peer ${public_key} endpoint ${endpoint_host}:${endpoint_port}"
wg set ${iface} peer ${public_key} endpoint "${endpoint_host}:${endpoint_port}"
}
# query ubus for all active wireguard interfaces
wg_ifaces=$(ubus -S call network.interface dump | jsonfilter -e '@.interface[@.up=true]' | jsonfilter -a -e '@[@.proto="wireguard"].interface' | tr "\n" " ")
# check every peer in every active wireguard interface
config_load network
for iface in $wg_ifaces; do
config_foreach check_peer_activity "wireguard_${iface}" "${iface}"
done
and I add it as a cronjob to check every 15mins (also add the normal script here, since it makes sense):