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Telekom DSL with Ubiquiti EdgeRouter

in categories Linux, Other

These days i exchanged my aging FritzBox with a Ubiquiti EdgeRouter Lite.

Most of the configuration including IPsec is pretty straightforward. The only thing which took a little bit more time is the "Zwangstrennung" (daily shutdown) of the PPPoE connection from my provider. I do the daily reconnect for my connection at 4 am every day.

To achieve that, a script and a daily call from cron is needed. Here is a article from the Ubiquiti Forum which helped a lot. Parts of the script are from there.

Create a script reconnect.sh under /config/scripts


# reconnect interface
$run disconnect interface pppoe0
sleep 20
$run connect interface pppoe0
sleep 20

# update dyndns
$run update dns dynamic interface pppoe0
sleep 20

# update ipsec
ip=`$run show interfaces | grep pppoe0 | sed 's/^.* \{1\}\([0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\) .*$/\1/g'`
echo "Current IP is $ip"

source /opt/vyatta/etc/functions/script-template
set vpn l2tp remote-access outside-address $ip

Activate the cron entry inside the console on your EdgeRouter

set system task-scheduler task RECONNECT crontab-spec "0 4 * * *"
set system task-scheduler task RECONNECT executable path /config/scripts/reconnect.sh

Do not forget to have the listen for the gui and ssh interface only on internal network

set service gui listen-address IP-ON-INTERNAL-NETWORK
set service ssh listen-address IP-ON-INTERNAL-NETWORK

Some other helpful commands

# add a static name to the dns resolver
set system static-host-mapping host-name arche inet a.b.c.d
# delete it
delete system static-host-mapping host-name arche

# start dyndns update
update dns dynamic interface pppoe0

# show actual dyndns state
show dns dynamic status

# set the ipsec ip address after it changed i.e. on pppoe
set vpn l2tp remote-access outside-address a.b.c.d

Dani says


Danke für den Artikel, hat mir mit meinem DHCP Problem ("VLAN Interface aktualisiert DHCP Lease nicht richtig" geholfen, zumindest mal bis der Fehler behoben ist).

$run renew dhcp interface eth0.412

-> das ganze dann in Crontab

Offenbar bin ich nicht der Einzige mit dem Problem. https://community.ubnt.com/t5/EdgeMAX/WAN-dropped-DHCP-renew-fixes-it/td-p/780660

Timo says


Thanks for the article, I needed to set up the daily reconnect as well and it provided a place for me to call curl to update my dynamic DNS entries after a reconnect.

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